CN105304028A - Image processing method and liquid crystal display - Google Patents
Image processing method and liquid crystal display Download PDFInfo
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- CN105304028A CN105304028A CN201510902188.3A CN201510902188A CN105304028A CN 105304028 A CN105304028 A CN 105304028A CN 201510902188 A CN201510902188 A CN 201510902188A CN 105304028 A CN105304028 A CN 105304028A
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Abstract
The embodiment of the invention provides an image processing method, an image processing device and a liquid crystal display (LCD), belonging to the image processing field. The method comprises: obtaining the backlight value of each backlight subarea according to the gray scale luminance value of a display image; and according to the weighted mean comparison result between the backlight value of a target backlight subarea and the backlight values of other backlight subareas, compensating for the sub-pixel display values in a corresponding display subarea of the target backlight subarea. The display image gray scale luminance difference in each display subarea leads to backlight luminance difference, and the backlight luminance difference causes local color cast in the display subarea; through determining the backlight luminance difference and color cast regularity, the sub-pixel display values in the display image are compensated to reduce color cast.
Description
Technical field
The present invention relates to field of liquid crystal display, particularly relate to a kind of image processing method and liquid crystal display.
Background technology
Liquid crystal display (LiquidCrystalDisplay is called for short LCD) adopts dynamic backlight modulation technique to control backlight illumination usually, can reach energy-conservation, promote the image quality effects such as display comparison degree.If Fig. 1 is dynamic backlight modulation technique principle assumption diagram in liquid crystal display in prior art, liquid crystal indicator comprises, image processing part receives received image signal, and collect backlight data according to picture signal gray-scale intensity, on the one hand, according to the specification of predetermined display panel, picture signal is carried out format transformation, export time schedule controller in liquid-crystal display section (TCON) to, timing control signal and data-signal is produced to drive liquid crystal panel through time schedule controller, on the other hand, export the backlight data collected to backlight handling part, backlight data is converted to backlight control signal by this backlight handling part, to control the brightness that backlight drive portion controls backlight in backlight assembly, if brightness of image is high, drive higher backlight illumination, if brightness of image is low, drive lower backlight illumination.
Dynamic backlight modulation technique mainly comprises subregion backlight modulation and overall backlight modulation.Wherein, overall situation backlight modulation techniques gathers the mean flow rate of a two field picture content to control backlight illumination; like this; backlight intrinsic brilliance is determined by a frame global image average gray-scale value; therefore; image averaging maximum gray value (that is: complete white field picture) corresponding driving obtains backlight high-high brightness, and in order to protect back light functional reliability, usual backlight high-high brightness controls below the nominal operation brightness of backlight.Usually in normal display frame, through adding up known, in dynamic video picture, ensemble average gray-scale intensity is at about 50%IRE, like this, the mean value of backlight illumination is then about 50% of maximum backlight illumination, therefore, in overall backlight modulation techniques, backlight actual motion average power controls about the half of rated power, is to a certain degree having obvious energy-saving effect.But, the average gray-scale intensity of global image of the frame that overall situation backlight modulation techniques collects or continuous multiple frames, overall back light source brightness is controlled by this image averaging GTG, this image averaging gray-scale intensity cannot to embody in picture material luminance detail between partial picture, but, picture contrast change to be embodied in picture material between partial picture on luminance difference, and therefore, it can play a role less to the image quality effect promoting display comparison degree.
And subregion dynamic backlight modulation technique, as backlight subarea schematic diagram in subregion dynamic backlight modulation technique in Fig. 2 prior art, whole backlight matrix comprises M the subregion in A direction and N number of subregion in B direction, as schemed to suppose M=16, N=9, count M*N=144 backlight subarea, in each backlight subarea, back light source brightness can drived control separately, wherein, it should be noted that, ideally, its backlight area can independently be illuminated in each backlight subarea in this backlight subarea, but in fact, adjacent back light source brightness has certain influence.In subregion dynamic backlight modulation technique, every frame global image is divided into multiple sectional image data block corresponding with backlight subarea, by gathering with luma data in this sectional image data block to obtain the backlight data of this corresponding backlight subarea, the each subregion backlight data collected embodies luminance difference between corresponding sectional image data block, like this, this backlight subarea backlight illumination is determined by the brightness of this backlight subarea correspondence image block, the change of subregion backlight illumination embodies gray-scale intensity in the sectional image data block needing viewing area picture, highlight display brightness difference between display image local picture, promote the contrast image quality effect of dynamic image.
Inventor is when utilizing common phosphors LED white light source, and in each backlight subarea, the color of white light source is basically identical, does not have colour cast phenomenon.Because common phosphors LED white light source principle produces gold-tinted by the blue-light excited yellow fluorescent powder of BLUE LED emissions chip emission to become white with blue light, and be not made up of pure color green glow and ruddiness in gold-tinted, cause common phosphors LED white light source gamut range not high, substantially at below 70%NTSC (English full name: NationalTelevisionStandardsCommittee).In order to improve liquid crystal display gamut range, take to utilize technology of quantum dots to provide backlight as liquid crystal display, the gamut range of backlight can reach more than 85%NTSC, even more than 100%NTSC.Example, quanta point material is encapsulated in the middle of two-layer water oxygen Obstruct membrane and forms quantum dot film, again this quantum dot film is arranged on the top of diffuser plate or light guide plate, quanta point material in blue light emitting chip excitation quantum point film is utilized to produce green glow and ruddiness, and be mixed into white backlight source, to promote the gamut range in white backlight source.
But, when utilizing quantum membrane technology for dynamic partition backlight control techniques, inventor find with common LED chip excitated fluorescent powder provide white backlight source unlike, in same employing subregion backlight technology scheme, at the backlight of LED chip excitation quantum point luminescence, each backlight subarea correspondence display sectional image color presents the local colour cast phenomenon of randomness, and this local colour cast regularity is poor.Such as: when middle region list is now white, and surrounding is partial to blueness, invention is artificial solves the partially blue problem in edge, reduce blue-light-emitting chip power, that is: lower the composition of blue light, like this, the blueness in region, edge can be solved, but zone line is but partial to yellow, that is: zone line green glow and ruddiness on the high side.
How to crack and utilize quantum dot membrane technology to provide the inconsistent reason of each display subregion color in the liquid crystal display of the dynamic partition backlight control techniques of backlight, and solve the problem of this each subregion colour consistency, become and need a technical solution difficult problem badly.
Summary of the invention
The embodiment of the present invention provides a kind of image processing method and liquid crystal display, effectively can solve and take technology of quantum dots to provide in the liquid crystal display of subregion backlight control of backlight, its display frame local colour cast problem.
For achieving the above object, providing a kind of liquid crystal display, backlight comparing section in the technical scheme that the embodiment of the present invention adopts, comparing according to the backlight value of target backlight subarea and the backlight value of other backlight subarea of surrounding; Compensatory control portion, determines the pixel voltage offset of each sub-pixel in described target display subregion according to backlight value comparative result; Compensating circuit, according to determining that described pixel voltage offset is with the pixel voltage value of each sub-pixel in target display subregion described in control and compensation.
The liquid crystal display that the embodiment of the present invention provides, compares according to the backlight value of target backlight subarea and the backlight value of other backlight subarea of surrounding; The pixel voltage offset of each sub-pixel in described target display subregion is determined according to backlight value comparative result; According to determining that described pixel voltage offset is with the pixel voltage value of each sub-pixel in target display subregion described in control and compensation, makes up backward light belt and carrys out backlight colour cast and cause display image color cast problem.。
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 provides a kind of liquid crystal display to show complete white picture view for prior art;
Fig. 2 provides a kind of liquid crystal display to show the display subregion light schematic diagram of complete white picture for prior art;
Fig. 3 is liquid crystal display colour cast causation analysis one schematic diagram;
Fig. 4 is liquid crystal display a kind of in this enforcement;
Fig. 5 provides a kind of schematic flow sheet of image processing method for this enforcement one;
Fig. 6 is the division schematic diagram showing screen display subregion in liquid crystal display;
Fig. 7 shows the corresponding backlight subarea schematic diagram divided of subregion with Fig. 6;
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 structural representation 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 structural representation of liquid crystal display for the present embodiment three.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
There is provided in the liquid crystal display of dynamic partition backlight control techniques of backlight utilizing quantum dot membrane technology, in order to solve the technical barrier that in this liquid crystal display, in viewing area, in each subregion, local color is inconsistent, inventor's initial analysis is thought, owing to occurring under the power same case of blue-light source that colour cast problem immediate cause is, in quantum dot film, quanta point material proportioning is uneven causes, if that is: zone line be pure white and peripheral regions deflection blue time, necessarily the quanta point material proportioning of quantum dot film zone line is mated with blue ray better, and quanta point material proportioning is on the low side in peripheral regions quantum dot film, cause peripheral regions blue ray composition on the high side and cause peripheral regions partially blue, therefore, the proportioning that inventor continues the quanta point material analyzing each region in quantum dot film finds, in quantum dot film, quanta point material proportioning is very even, there are not the problems referred to above.
As in the colour cast phenomenon of above-mentioned local, zone line be pure white and peripheral regions deflection blue time, inventor tentatively thinks that the reason of this phenomenon should have relation with position, viewing area.Inventor continues analysis and learns, when quanta point material proportioning in quantum dot film is even and in each backlight subarea, blue-light-emitting chip power is also identical, if Fig. 3 is liquid crystal display colour cast causation analysis one schematic diagram, as shown in Figure 3, white light source sends quanta point material in blue-light excited quantum dot film by LED luminescence chip and sends green glow and ruddiness and be uniformly mixed into white light transmitted through the blue light of quantum dot film.But, when zone line shows whole white image and surrounding adjacent area also shows whole white image, LED chip emissive power in zone line LED chip and adjacent area is driven all to reach 100%, in this zone line white light source, a part be the forward direction green glow G0 that produced by middle BLUE LED emissions chip excitation quantum point material and between forward direction ruddiness R0 and the blue light of transmission mixed light form, another part is that blue-ray LED luminescence chip that surrounding is adjacent excites and produces backward green glow G1 and backward ruddiness R1 blue light mixed light after reflexing to zone line and zone line blue-ray LED luminescence chip transmission quantum film and form, when this two parts green glow and ruddiness and transmit blue are mixed into white, but, reflect green light zone line relative to ruddiness can be received in region, edge will lack, the blue light ingredient of transmission is identical with zone line, therefore, after the mixed light of region, edge, in white light composition, blue light ingredient is on the high side, and cause partially blue.But, when inventor finds different images content, as: zone line whole white image, and surrounding adjacent area brightness of image lower time, find that again zone line is also partially blue, and the partially blue phenomenon of peripheral regions weakens, therefore, inventor finds that colour cast phenomenon and position, viewing area are without direct relation.
Inventor is after large component analysis and Experimental comparison, the final regularity just finding above-mentioned local colour cast, colour cast is main has direct relation with LED luminosity difference in adjacent backlight subarea, if when image display brightness is identical in each subregion, does not have local colour cast phenomenon.When there is display brightness difference in each subregion adjacent, that is: in the liquid crystal display of dynamic partition backlight control, the backlight illumination of each adjacent backlight subarea is different, can produce the colour cast phenomenon of adjacent display subregion.Inventor analyzes further based on above-mentioned colour cast rule and finds colour cast reason, as shown in Figure 3, when zone line is identical with adjacent area display brightness of image, that is: corresponding backlight illumination is also identical, zone line white backlight composition comprises, part LED chip 1 luminescence excites zone line quantum dot produce green glow and be redly mixed into white light with transmitting blue, and another part is that the backward light of green and the backward light of redness that in the blue light of LED chip 1 transmission and adjacent area, LED chip 2 and LED chip 3 luminous excitation quantum point produce and LED chip 1 transmit blue are mixed into white light.But, when zone line still shows whole white image and surrounding adjacent area dark images, complete white brightness of image correspondence according to this zone line drives backlight illumination to be 100%, that is: driving LED chip 1 is luminous 100% power, simultaneously, in surrounding adjacent area LED chip 2 and 3 luminous powers lower, like this, reduce from the green glow of surrounding neighboring reflection and ruddiness in zone line white light composition, cause the partially blue phenomenon of zone line simultaneously, and LED chip 1 produces backward green glow and red color light component is more, make in surrounding adjacent area partially yellow.For another example: intermediate image brightness is lower, when surrounding adjacent area brightness of image is higher, LED chip 1 luminosity is lower than the brightness of the adjacent LED chip 2 and 3 of surrounding, like this, excite composition in backward green glow and reflection to red light to zone line on the high side from surrounding adjacent LED chip 2 and 3 in zone line white backlight composition, cause zone line to show image deflection yellow, and in surrounding brighter areas from the backward green glow of LED chip and ruddiness less, cause the brighter viewing area of surrounding partially blue.
The ultimate principle of the liquid crystal display that dynamic backlight controls is control the brightness of backlight in corresponding backlight subarea according to sectional image brightness size, and each subregion back light source brightness is according to the random variation of picture material brightness.Above-mentioned analysis is learnt, this rule is that LED chip luminosity region bigger than normal is partially blue, luminosity region less than normal is partially yellow, in order to solve the problem of this random local colour cast along with backlight illumination difference causes, first inventor considers a solution, reduce partially blue problem by reducing LED power difference method, this ultimate principle that is obvious and dynamic backlight control technology is contradiction.Therefore, if take the backlight of quantum dot film must cause display image randomness local colour cast problem, to those skilled in the art, how solving the randomness local colour cast problem that this backlight illumination difference brings is that it faces a technical barrier.
The analytic process of creative work is paid based on foregoing invention people, in the liquid crystal display of dynamic partition backlight control techniques, the light-source brightness of each backlight subarea is determined by the overall gray-scale intensity values showing image in display subregion corresponding to this backlight subarea, the back light source brightness of this backlight subarea of the higher driving of its gray-scale intensity is higher, in this subregion backlight BLUE LED emissions chip excitation quantum point film in the backward light of green that produces of quantum dot and red backward light more, larger on the impact of the color of adjacent area composition.Based on above-mentioned analytical mathematics, inventor pays proposition a solution of creative work, by image gray-scale level brightness in each display subregion of statistical study, each pixel voltage value of this subregion is compensated according to this gray-scale intensity measures of dispersion, make up backlight colour cast bring display image color cast problem by compensating pixel voltage value in this display subregion, solve this randomness local repressentation 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, time schedule controller (TOCN) receives outside input RGB and shows view data, through extracting clock signal and viewdata signal, wherein, clock signal is supplied to data drive circuit and gate driver circuit respectively, realize cogradient matrices scanning, and viewdata signal is supplied to data drive circuit, and to carry out digital-to-analog conversion is pixel voltage value D
1-D
m, this pixel voltage value D
1-D
mbe respectively used to drive TFT data electrode in liquid crystal pixel cells, according to image gray-scale level luminance difference in each adjacent sectors in the present invention, determine to compensate each sub-pixel R(in each subregion red), G(is green) and B(blueness) pixel voltage value, to make up white light source colour cast problem in each backlight subarea.Concrete, according to difference between the backlight value of target backlight subarea and the backlight value of other backlight subarea, determine the pixel voltage value compensating each sub-pixel in each subregion.
Example, as shown in Figure 9, in display subregion 1, image gray-scale level brightness value is greater than when showing sectional image gray-scale intensity around, due in backlight in corresponding backlight subarea in this display subregion 1 from red in around backlight subarea and the backward light of green, than its image gray-scale level brightness be less than show sectional image gray-scale intensity around time this redness and green backward light ratio example low, now, can by improving the pixel voltage value D of this display subregion 1 sub-pixel R in proportion
1with the pixel voltage value D of sub-pixel G
2,also can by reducing the pixel voltage value D of sub-pixel B
3, to make up the displaying contents colour cast problem that the inconsistent colour cast of backlight colour mixture is brought.
Wherein, around display sectional image gray-scale intensity is that around all backlight subarea are determined the weighted value that the backlight illumination of this display subregion 1 affects.As: around display sectional image gray-scale intensity is gray-scale intensity values and the weighting coefficient sum of products of each subregion around, and weighting coefficient is shown the distance decision of subregion by this each subregion distance objective, the display subregion that distance is far away is less on target partition impact, and its weighting coefficient is less.In practical application, this weighting coefficient can obtain the laboratory facilities that target partition brightness affects amplitude by measuring each subregion in advance, also can determine this weighted value by distance size relation.
In the liquid crystal display that the subregion backlight adopting monochromatic luminescence chip excitation quantum point film to produce white backlight source independently controls, control signal is generated to control back light source brightness in this backlight subarea by the gray-scale intensity showing image in each display subregion, like this, the backlight subarea back light source brightness that in display subregion, image gray-scale level brightness is higher is also higher, therefore, in each backlight subarea, backlight illumination size is random variation, causing in each backlight subarea also can be different from this backlight subarea forward light ratio from backward light in around backlight subarea in backlight mixed light, and owing to only having redness and green mixed light in backward light, in forward light, redgreenblue light mixng proportion is then determined, mix white light by forward light and backward light to be just difficult to reach white consistance, the present invention is in order to solve the problem, take to adjust the pixel voltage value of display subregion sub-pixel R and the pixel voltage value of sub-pixel G in proportion, or, the pixel voltage value of adjustment sub-pixel B, reduce this backward light in the different impact of white light colour mixture accounting, wherein, Such analysis is known, due to backward light in white mixed light composition proportion by this subregion backlight illumination and around between backlight subarea measures of dispersion determine, therefore, the pixel voltage value of red sub-pixel and green sub-pixels or the magnitude of voltage of blue subpixels in this display subregion is adjusted according to this backlight illumination measures of dispersion size, backward light can be made up and cause display colour cast problem.
Embodiment one
The embodiment of the present invention provides a kind of image processing method to be applied in liquid crystal display, technology of quantum dots is adopted to provide backlight in this liquid crystal display, example, if Fig. 4 is liquid crystal display a kind of in this enforcement, the back light that this liquid crystal display provides for down straight aphototropism mode set, the back encapsulating structure 701(that multiple pointolite 200 is arranged on backlight module as: on backboard) base plate 704 inside surface on, pointolite 200 can blue led lamp, quanta point material encapsulation part 702 is positioned at the light direction of multiple pointolite 200, in order to quanta point material heat-proof quality needs and the luminous fully mixed light requirement of multiple pointolite 200, certain heat insulation gap and light mixing distance will be kept between quanta point material encapsulation part 702 and multiple pointolite 200, wherein, multiple pointolite 200 sends exciting light (as: blue light) by after abundant mixed light, form uniform perturbed surface light source.Then, this perturbed surface light source produces with the quanta point material be activated on light direction the exciting light formation white light source that energized light forms mixed light and/or transmission, this quanta point material is encapsulated in quanta point material encapsulation part 702, wherein, quanta point material encapsulation part 702 can be encapsulate quantum dot composition in diffuser plate, can form by encapsulating in blooming piece quantum dot, but also other encapsulating optical structures.Due to multiple pointolite 200 send exciting light respectively excitation quantum point encapsulation part 702 time, the backward energized light (as: backward green glow and ruddiness) that each pointolite has excitation quantum point to produce respectively, this backward energized light can form the optics composition of adjacent area white light, its power must affect adjacent area white colours, influencing each other to reduce between it, needing to reduce this backward light to the impact of adjacent area.
Take in this liquid crystal display of subregion backlight dynamic control technology, need according to the gray-scale intensity of backlight zoning ordinance by display image frame subregion statistical picture picture, undertaken by gray-scale intensity values in this display image frame subregion being converted into the drive singal driving backlight, that is: this average gray-scale intensity of display image frame subregion higher conversion backlight drive signal drives the brightness of backlight in this backlight subarea also larger.
Be pointed out that, those of ordinary skill in the art can by being configured in the quantity of the quantum dot producing ruddiness, green glow and blue light in quanta point material encapsulation part 702, white light can be generated, to make, in each backlight subarea under backlight illumination same case, pure white light source can be formed.In order to solve the brightness of different backlight subarea in subregion backlight Dynamic controlling along with when showing sectional image content brightness change, create local colour cast problem in display subregion, a kind of image processing apparatus is also comprised in liquid crystal display in the present embodiment, this image processing apparatus can be one or more video frequency processing chip, can be part of functions in video frequency processing chip.If Fig. 8 is a kind of image processing apparatus schematic diagram, this device 10 comprises: acquiring unit 101 and compensating unit 102.
A kind of image processing method is performed in this image processing apparatus, a kind of image processing method is also provided in the present embodiment, as Fig. 5 for this enforcement one provides a kind of schematic flow sheet of image processing method, acquiring unit 101 performs step 101 program in image processing method, and compensating unit 102 performs step 102 program in image processing method.
Step 101, the gray-scale intensity values according to display image obtains backlight value in each backlight subarea, and this backlight value is in order to drive separately back light source brightness in each backlight subarea.Wherein, in this each backlight subarea, backlight can form by single or multiple pointolite, this pointolite is as LED luminescence chip, in each backlight subarea, the brightness of back light controls separately its brightness, and in this backlight subarea, back light source brightness size is determined by mapping display sectional image gray-scale intensity in this backlight subarea.
Example, CPU process chip receives inputted video image signal, this CPU process chip is according to predetermined picture portion rule, to gather in this video signal gray-scale intensity values in each image part district respectively, this gray-scale intensity can mean value, or average weighted value, then the gray-scale intensity values collected is exported to backlight handling part, gray-scale intensity values is converted to backlight control signal by this backlight handling part, to control the brightness that backlight drive portion controls all pointolites in this backlight subarea, example, single or multiple pointolite can be comprised in a backlight subarea, as LED luminescence chip, if image frame brightness is higher in this subregion, drive the brightness of point of excitation light source in this backlight subarea higher, if image frame brightness is lower in this subregion, drive point of excitation light-source brightness in this subregion backlight lower, all right on the other hand, according to the specification of predetermined display panel, picture signal is carried out format transformation, export time schedule controller in liquid-crystal display section (TCON) to, timing control signal and data-signal is produced to drive liquid crystal panel through time schedule controller.
It should be noted that, gray-scale intensity values can carry out YUV color space by red grey decision-making, green grey decision-making and blue grey decision-making and be converted to intensity gray scale value Y-component.Example, in liquid crystal display, cpu chip receives image video signal and carries out decoding and obtain rgb signal, again by low-voltage differential signal (English full name: Low-VoltageDifferentialSignaling, English abbreviation: LVDS) be transferred to video processnig algorithms chip, this video frequency processing chip first carries out YUV signal to this rgb signal and is converted to luminance component Y value in each pixel, this video processnig algorithms chip adds up the luma component values of each pixel in each display subregion according to predetermined display zoning ordinance, in this display subregion, luma component values carries out the backlight value that pre-defined algorithm is converted to this backlight subarea, then, the backlight value of this backlight subarea is in order to drive back light source brightness in this backlight subarea.To those skilled in the art, algorithm luminance component being converted to this subregion backlight value is very many, does not repeat them here.
Gray-scale intensity values can also be, obtain the grey decision-making sum of all red pixels in each display subregion, the average gray-scale value of all red pixels in display subregion is obtained according to the grey decision-making sum of all red pixels in display subregion, the weighted mean value of the average gray-scale value obtaining all red pixels in display subregion again and the maximum gray value showing all red pixels in subregion, obtains the red grey decision-making showing subregion.In like manner, then obtain each display subregion Green grey decision-making and blue grey decision-making, be converted to intensity gray scale value in this subregion by red GTG, green grey decision-making and blue grey decision-making in display subregion, be converted to the backlight value of this backlight subarea by this intensity gray scale value.
It should be noted that, display subregion can divide according to backlight subarea, and backlight subarea can divide according to backlight, and wherein, the backlight of each independent control is a backlight subarea, and display subregion and backlight subarea are generally mutually corresponding one to one.Optionally, display subregion can also be that the image shown according to actual liquid crystal display divides, and the backlight portion region that so each display subregion is corresponding is exactly backlight subarea.Each backlight subarea may comprise a backlight pointolite also may comprise multiple backlight pointolite, and pointolite is as single led luminescence chip.
Example, suppose that liquid crystal display comprises 9 display subregions and 9 backlight subarea, display subregion and backlight subarea are mutually corresponding one to one.If Fig. 6 is the division schematic diagram showing screen display subregion in liquid crystal display, as viewing area being divided into 9 regions, comprise display subregion 1, display subregion 2, display subregion 3, display subregion 4, display subregion 5, display subregion 6, display subregion 7, display subregion 8 and display subregion 9, like this, as Fig. 7 shows the corresponding backlight subarea schematic diagram divided of subregion with Fig. 6, corresponding backlight is also divided into 9 subregions, comprise: backlight subarea 1, backlight subarea 2, backlight subarea 3, backlight subarea 4, backlight subarea 5, backlight subarea 6, backlight subarea 7, backlight subarea 8 and backlight subarea 9.In backlight subarea 1, backlight value converts by showing gray-scale intensity values in subregion 1, as: in this display subregion 1, gray-scale intensity values is 255 GTGs, in backlight subarea 1, backlight value is 255, PWM backlight control signal or current controling signal can be converted to control the brightness of backlight by 255, also gray-scale intensity values 255 can be obtained backlight value through further transfer algorithm, backlight value is converted to PWM backlight control signal or current controling signal to control the brightness of backlight after by conversion.
Step 102, according to comparative result between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, compensate the color range numerical value of these target backlight subarea correspondence display subregion sub-pixel display data.
Carry out GTG be converted into pixel voltage value to drive on display panel TFT data electrode in each sub-pixel unit according to showing data after this compensation, affect display image color cast problem to make up each display subregion backlight colour cast.
Concrete, when backlight value in target backlight subarea is greater than the backlight value weighted mean of other backlight subarea, the color range numerical value of the display data of all redness and green sub-pixels in this target backlight subarea correspondence display subregion can be improved, also can reduce the color range numerical value of all blue subpixels display data in this target display subregion.
Same, when backlight value in target backlight subarea is less than the backlight value weighted mean of other backlight subarea, the color range numerical value of the display data of all blue subpixels in this target backlight subarea correspondence display subregion can be reduced, also can improve the color range numerical value of the display data of all redness and green sub-pixels in this target display subregion.
When the color range numerical value of the display data of the redness compensated in this target backlight subarea correspondence display subregion and green sub-pixels, in this display subregion, all redness are identical with the compensating proportion amplitude of the color range numerical value of the display data of green sub-pixels, when compensating the color range numerical value of display data of the blue subpixels in this target backlight subarea correspondence display subregion, in this display subregion, the compensating proportion amplitude of the color range numerical value of the display data of all blue subpixels is identical.
Wherein, according to ratio between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, compensate the color range numerical value of these target backlight subarea correspondence display subregion sub-pixel display data according to this ratio.
Example: the backlight value of target backlight subarea 5 is 255, in other backlight subarea, backlight value weighted mean is 200, like this, backlight subarea 5 is 55 with the difference of the backlight value weighted mean of other backlight subarea, compensate the displayed value of all redness and green sub-pixels in display subregion 5, concrete compensation magnitude value install beforehand tables of data and being obtained by lookup table mode, also can other account forms obtain, those skilled in the art, when designing, need to consider specifically to determine computing formula from the reflection ray ratio of adjacent sectors in rear concrete backlight subarea.As: when difference is 55/255, and adjacent sectors backlight influence coefficient is 10%, and compensating amplitude is (55/255) * 10%=2.1%, and like this, in this display subregion 5, the color range numerical value of the display data of all redness and green sub-pixels promotes 2.1% in proportion.
In addition, also can by preset two-dimensional data table, lookup table mode is carried out according to the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, determine the compensation magnitude of the color range numerical value of corresponding sub-pixel display data in this target partition, according to the color range numerical value determining to compensate corresponding sub-pixel display data in this target partition of amplitude compensation.
Illustrate, the backlight value weighted mean of other backlight subarea is that the backlight value of all or part of backlight subarea except target backlight subarea is multiplied by corresponding weighting coefficient and determines.Example, backlight subarea 1 is target partition, other backlight subarea are backlight subarea 2, backlight subarea 3, backlight subarea 4, backlight subarea 5, backlight subarea 6, backlight subarea 7, backlight subarea 8 and backlight subarea 9, in fact, if consider and affect backlight subarea 1 very little away from other backlight subarea 3 of backlight subarea 1, backlight subarea 6, backlight subarea 7, backlight subarea 8 and backlight subarea 9, this other backlight subarea away from backlight subarea 1 in the backlight value weighted mean of other backlight subarea, can not be comprised.Go on to say, the weighting coefficient of corresponding backlight subarea is determined target backlight subarea brightness contribution size by its backlight illumination, and wherein, more the weighting coefficient of the backlight subarea of wide backlight subarea is less again.
Concrete, obtain the backlight value weighting coefficient acquisition methods of other backlight subarea outside this target backlight subarea, those skilled in the art can experimentally mode obtain, as: backlight subarea 1 is target backlight subarea, can by closing or open backlight subarea 2 mode time backlight subarea 1 brightness situation of change, the backlight subarea 1 backlight illumination contribution of 2 pairs, acquisition backlight subarea is little obtains weighting coefficient greatly, same, obtains the weighting coefficient of other backlight subarea.Then, each backlight subarea is obtained respectively the weighting coefficient of other backlight subarea as target backlight subarea, obtain the weighting coefficient of other backlight subarea outside the target backlight subarea prestored with lookup table mode, then calculate the backlight value weighted mean of other backlight subarea.Also can determine this weighting coefficient according to target backlight value and other backlight subarea distance parameters, wherein, the brightness impact of backlight subarea on target backlight subarea that distance is far away is less, and its weighting coefficient is also less.
In the present embodiment, gray-scale intensity values according to display image obtains backlight value in each backlight subarea, according to comparative result between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, compensate the color range numerical value of these target backlight subarea correspondence display subregion sub-pixel display data, this pixel voltage making up the color range numbers translate of rear display data shows to drive pixel, backlight illumination difference is brought owing to showing image gray-scale level luminance difference in each display subregion, backlight illumination difference brings local colour cast problem in this display subregion, and determine the regularity of difference and colour cast between backlight illumination, colour cast phenomenon is alleviated by the color range numerical value compensating display image sub-pixel display data.
Embodiment two:
The present embodiment two provides a kind of liquid crystal display, this liquid crystal display as shown in Figure 4, for the back light that down straight aphototropism mode set provides, the back encapsulating structure 701(that multiple pointolite 200 is arranged on backlight module as: on backboard) base plate 704 inside surface on, pointolite 200 can blue led lamp, quanta point material encapsulation part 702 is positioned at the light direction of multiple pointolite 200, in order to quanta point material heat-proof quality needs and the luminous fully mixed light requirement of multiple pointolite 200, certain heat insulation gap and light mixing distance will be kept between quanta point material encapsulation part 702 and multiple pointolite 200, wherein, multiple pointolite 200 sends exciting light (as: blue light) by after abundant mixed light, form uniform perturbed surface light source.Then, this perturbed surface light source produces with the quanta point material be activated on light direction the exciting light formation white light source that energized light forms mixed light and/or transmission, this quanta point material is encapsulated in quanta point material encapsulation part 702, wherein, quanta point material encapsulation part 702 can be encapsulate quantum dot composition in diffuser plate, can form by encapsulating in blooming piece quantum dot, but also other encapsulating optical structures.This liquid crystal display is taked in this liquid crystal display of subregion backlight dynamic control technology, need according to the gray-scale intensity of backlight zoning ordinance by display image frame subregion statistical picture picture, undertaken by gray-scale intensity values in this display image frame subregion being converted into the drive singal driving backlight, that is: this average gray-scale intensity of display image frame subregion higher conversion backlight drive signal drives the brightness of backlight in this backlight subarea also larger.
As aforementioned known, red in order to determine to compensate each subregion sub-pixel R(), G(is green) and B(blueness) pixel voltage value, as shown in Figure 10, this liquid crystal display comprises: image processing part, it obtains backlight value in each backlight subarea according to the gray-scale intensity values of display image, backlight comparing section, it compares according to the backlight value weighted mean of the backlight value of target backlight subarea and other backlight subarea, reference voltage generating unit, according to the backlight value comparative result of backlight comparing section, it determines that the color range numerical value of this target backlight subarea correspondence display subregion sub-pixel carries out the reference voltage of digital-to-analog conversion, red with each sub-pixel R(in Compensation Objectives display subregion), G(is green) and B(blueness) pixel voltage value.
In prior art, digital to analog converter is converted to simulating signal in order to color range numerical value redgreenblue being shown data, by each respective data lines on display panels, be applied to the pixel voltage of each display pixel cells respectively, wherein, image consistency is shown with by applying subjective reflection on electric field liquid crystal cells for making the color range value of display data, different color range value corresponding conversion reference data voltage is different, close display image is reflected to realize identical color range data by different liquid crystal with reference data voltage corresponding relation by adjustment color range correspondence, that is: gamma curve is adjusted.Wherein, in order to better display effect, often kind of color sub-pixels corresponding gamma curve respectively, this gamma curve comprises different color range data reference voltage value corresponding different respectively.Therefore, in prior art, in order to objectively respond display image consistency, the reference voltage that color range identical in the sub-pixel of same color is corresponding is identical, that is, same color sub-pixel only has a gamma curve, and this gamma curve reflects the corresponding different reference voltage value of different color range value, that is: an a kind of color range value of color sub-pixels is at a corresponding reference voltage value.
In order to solve because backward redness and green light can impact adjacent backlight subarea backlight color, around in adjacent area, backward redness and green light size can cause in the white light of target backlight subarea red, green and blue light proportioning is lacked of proper care, the easy colour cast problem to make target backlight subarea backlight color not controlled, in the present embodiment two, compare according to the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, the reference voltage value that the color range value of each display data is corresponding is determined by comparative result, that is: when the mutually same color range value showing data in same color sub-pixels, owing to producing different comparative result under different backlight illumination, also different reference voltage value can be determined, this different reference voltage value makes up backward redness and green light can cause in the white light of target backlight subarea red, green and blue light proportioning variation issue.
Concrete, the backlight value of target backlight subarea is identical with embodiment one with the backlight value weighted mean acquisition methods of other backlight subarea, does not repeat them here.
In this enforcement two, owing to showing the same color range value of data in same color sub-pixels, the reference voltage of different digital-to-analog conversions can be determined according to the backlight value of target backlight subarea and the backlight value weighted mean comparative result of other backlight subarea, different pixels magnitude of voltage can be converted to drive on display panel TFT data electrode in corresponding sub-pixel unit, to make up the display image colour cast problem that target display subregion brings due to backlight colour cast.
What further illustrate is, when backlight value in target backlight subarea is greater than the backlight value weighted mean of other backlight subarea, the reference voltage of the digital-to-analog conversion of all redness and green sub-pixels in corresponding display subregion in this target backlight subarea can be determined, it is made to improve the pixel voltage value of all redness and green sub-pixels in this display subregion, also can determine the reference voltage of the digital-to-analog conversion of all blue subpixels in corresponding display subregion in this target backlight subarea, make it reduce the pixel voltage value of all blue subpixels in this display subregion.
When backlight value in target backlight subarea is less than the backlight value weighted mean of other backlight subarea, the reference voltage of the digital-to-analog conversion of all redness and green sub-pixels in corresponding display subregion in this target backlight subarea can be determined, it is made to reduce the pixel voltage value of all redness and green sub-pixels in this display subregion, also can determine the reference voltage of the digital-to-analog conversion of all blue subpixels in corresponding display subregion in this target backlight subarea, make it improve the pixel voltage value of all blue subpixels in this display subregion.
Wherein, in this target display subregion, when needing the pixel voltage value of all redness and green sub-pixels, its all redness is identical with green sub-pixels resize ratio amplitude, same, when needing the pixel voltage value of all blue subpixels, its all blue subpixels resize ratio amplitude is also identical.
Also can by preset two-dimensional data table, lookup table mode is carried out according to the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, determine the reference voltage value of the color range numerical value conversion of corresponding sub-pixel display data in this target partition, wherein, in this preset two-dimensional data table, reference needs compensation magnitude to arrange.Wherein, this compensation magnitude can method by experiment, and the statistics around backward redness of generation of backlight subarea and the backlight illumination influence degree of green light to target backlight subarea is determined.Also can according to ratio between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, and around other backlight subarea backlight illumination corresponding target backlight subarea influence degrees determine this compensation magnitude.
Example, Figure 11 is reference voltage generating unit output reference voltage value schematic diagram in the present embodiment two, as shown in the figure, export V0 ~ Vmm different reference voltage value, wherein, backlight comparing section, generate the comparative result of the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, the reference voltage value that reference voltage generating unit is corresponding according to the color range value of this comparative result tables of data reading displayed data from reference voltage storage part, and according to reading reference voltage value generate corresponding reference voltage output valve digital to analog converter carry out color range data conversion generate corresponding pixel voltage.
Wherein, reference voltage storage part comprises multiple look-up table, for the backlight value different look-up table corresponding to the backlight value weighted mean of other backlight subarea according to the different backlight subarea of storage, each look-up table reference voltage value that corresponding different color range data are corresponding respectively.
Also can according to the corresponding different look-up table of the different difference of ratio between the backlight value of backlight subarea and the backlight value weighted mean of other backlight subarea, it arranges the relative look-up table number of look-up method according to ratio and will lack.
Adjacent backlight subarea backlight colour mixture is affected by backward redness and green light in order to solve, around in adjacent area, backward redness and green light size control to adjust along with dynamic backlight, this adjustment can cause backward redness and green can cause in the white light of target backlight subarea red, green and blue light proportioning is lacked of proper care, cause target backlight subarea backlight color not controlled and easy colour cast problem, compare according to the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea in target display subregion in the present embodiment two, preset different gamma curve is adopted according to comparative result, the conversion reference voltage of each sub-pixel from this gamma curve determination target display subregion, wherein, this preset gamma curve is red with each sub-pixel R(in Compensation Objectives display subregion), G(is green) and B(blueness) pixel voltage value, backward light belt can be made up by adjustment pixel voltage value to carry out backlight colour cast and cause display image color cast problem.
Embodiment three:
The present embodiment three provides a kind of liquid crystal display, this liquid crystal display as shown in Figure 4, for the back light that down straight aphototropism mode set provides, the back encapsulating structure 701(that multiple pointolite 200 is arranged on backlight module as: on backboard) base plate 704 inside surface on, pointolite 200 can blue led lamp, quanta point material encapsulation part 702 is positioned at the light direction of multiple pointolite 200, in order to quanta point material heat-proof quality needs and the luminous fully mixed light requirement of multiple pointolite 200, certain heat insulation gap and light mixing distance will be kept between quanta point material encapsulation part 702 and multiple pointolite 200, wherein, multiple pointolite 200 sends exciting light (as: blue light) by after abundant mixed light, form uniform perturbed surface light source.Then, this perturbed surface light source produces with the quanta point material be activated on light direction the exciting light formation white light source that energized light forms mixed light and/or transmission, this quanta point material is encapsulated in quanta point material encapsulation part 702, wherein, quanta point material encapsulation part 702 can be encapsulate quantum dot composition in diffuser plate, can form by encapsulating in blooming piece quantum dot, but also other encapsulating optical structures.This liquid crystal display is taked in this liquid crystal display of subregion backlight dynamic control technology, need according to the gray-scale intensity of backlight zoning ordinance by display image frame subregion statistical picture picture, undertaken by gray-scale intensity values in this display image frame subregion being converted into the drive singal driving backlight, that is: this average gray-scale intensity of display image frame subregion higher conversion backlight drive signal drives the brightness of backlight in this backlight subarea also larger.
As aforementioned known, red in order to determine to compensate each subregion sub-pixel R(), G(is green) and B(blueness) pixel voltage value, as shown in figure 12, this liquid crystal display comprises: image processing part, it obtains backlight value in each backlight subarea according to the gray-scale intensity values of display image, backlight comparing section, it compares according to the backlight value weighted mean of the backlight value of target backlight subarea and other backlight subarea, compensatory control portion, according to the backlight value comparative result of backlight comparing section, it determines that in this target backlight subarea correspondence display subregion, each sub-pixel R(is red), G(is green) and B(blueness) pixel voltage offset, compensating circuit, according to determining that this pixel voltage offset is with the pixel voltage value of each sub-pixel in this display subregion of control and compensation.
Concrete, the backlight value of target backlight subarea is identical with embodiment one with the backlight value weighted mean acquisition methods of other backlight subarea, does not repeat them here.Wherein, compensating circuit belongs to prior art category, and those skilled in the art can arrange concrete compensating circuit.
Wherein, according to pixel magnitude of voltage after this compensation to drive on display panel TFT data electrode in each sub-pixel unit, affect display image color cast problem to make up each display subregion backlight colour cast.
Concrete, when backlight value in target backlight subarea is greater than the backlight value weighted mean of other backlight subarea, compensatory control portion determines the pixel voltage offset of each sub-pixel by lookup table mode, according to this, compensating circuit can determine that offset improves the pixel voltage value of all redness and green sub-pixels in this target backlight subarea correspondence display subregion, also can determine that offset reduces the pixel voltage value of all blue subpixels in this target display subregion according to this.
Same, when backlight value in target backlight subarea is less than the backlight value weighted mean of other backlight subarea, compensatory control portion determines the pixel voltage offset of each sub-pixel by lookup table mode, according to this, compensating circuit can determine that offset reduces the pixel voltage value of all redness and green sub-pixels in this target backlight subarea correspondence display subregion, also can determine that offset improves the pixel voltage value of all blue subpixels in this target display subregion according to this.
Further illustrate, compensatory control portion determines that the compensating proportion amplitude of the pixel voltage offset of each sub-pixel is identical.Concrete, when compensating redness in this target display subregion and the pixel voltage value of green sub-pixels, in this display subregion, all redness are identical with the compensating proportion amplitude of the pixel voltage value of green sub-pixels, when compensating the pixel voltage value of the blue subpixels in this target display subregion, in this display subregion, the compensating proportion amplitude of the pixel voltage value of all blue subpixels is identical.
Concrete, also can by preset two-dimensional data table, in this preset two-dimensional data table, reference needs compensation magnitude to arrange.Wherein, this compensation magnitude can method by experiment, and the statistics around backward redness of generation of backlight subarea and the backlight illumination influence degree of green light to target backlight subarea is determined.Also can according to ratio between the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea, and around other backlight subarea backlight illumination corresponding target backlight subarea influence degrees determine this compensation magnitude.
Adjacent backlight subarea backlight colour mixture is affected by backward redness and green light in order to solve, around in adjacent area, backward redness and green light size control to adjust along with dynamic backlight, this adjustment can cause backward redness and green can cause in the white light of target backlight subarea red, green and blue light proportioning is lacked of proper care, cause target backlight subarea backlight color not controlled and easy colour cast problem, compare according to the backlight value of target backlight subarea and the backlight value weighted mean of other backlight subarea in target display subregion in the present embodiment three, according to preset two-dimensional look-up table, determine the pixel voltage offset of each sub-pixel in this display subregion, according to this offset control and compensation finally in order to the pixel voltage value of TFT data electrode in driven element pixel cell, carry out backlight colour cast to make up backward light belt and cause display image color cast problem.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM (read-only memory) (Read-OnlyMemory, ROM), random access memory (Random-AccessMemory, RAM), magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (7)
1. a liquid crystal display, is characterized in that,
Backlight comparing section, compares according to the backlight value of target backlight subarea and the backlight value of other backlight subarea of surrounding;
Compensatory control portion, determines the pixel voltage offset of each sub-pixel in described target display subregion according to backlight value comparative result;
Compensating circuit, according to determining that described pixel voltage offset is with the pixel voltage value of each sub-pixel in target display subregion described in control and compensation.
2. according to liquid crystal display described in claim 1, it is characterized in that, described compensatory control portion, specifically comprises:
Determine that in described target display subregion, red sub-pixel is identical with the compensating proportion amplitude of the pixel voltage value offset of green sub-pixels
,or, determine that the compensating proportion amplitude of the pixel voltage value of blue subpixels in described target display subregion is identical.
3. according to liquid crystal display described in claim 1, it is characterized in that, described backlight comparing section, specifically comprises:
Determine the ratio of the target display backlight value of subregion and the weighting backlight value sum of surrounding backlight subarea.
4. according to liquid crystal display described in claim 3, it is characterized in that, around the weighting coefficient of the weighting backlight value of other backlight subarea is determined by the distance of distance objective backlight subarea, and wherein, the weighting coefficient of the display subregion that distance objective display subregion is far away is less.
5., according to liquid crystal display described in claim 1, it is characterized in that,
Described compensatory control portion, specifically for determining the pixel voltage offset of each sub-pixel by lookup table mode.
6., according to liquid crystal display described in claim 1, it is characterized in that, when backlight value in target backlight subarea is greater than the backlight value weighted mean of other backlight subarea,
Described compensating circuit, specifically for according to described offset to improve the pixel voltage value of all redness and green sub-pixels in described target display subregion, or, the pixel voltage value of all blue subpixels in described target display subregion is reduced according to described offset.
7., according to liquid crystal display described in claim 1, it is characterized in that, when backlight value in target backlight subarea is less than the backlight value weighted mean of other backlight subarea,
Described compensating circuit, specifically for according to described offset to reduce the pixel voltage value of all redness and green sub-pixels in described target display subregion, or, the pixel voltage value of all blue subpixels in described target display subregion is improved according to described offset.
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| CN114495842A (en) * | 2021-12-31 | 2022-05-13 | 广东晶科电子股份有限公司 | Liquid crystal display device based on Mini LED backlight source and local dimming and driving method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108231013A (en) | 2018-06-29 |
| CN105304028B (en) | 2017-12-19 |
| CN108231013B (en) | 2019-11-29 |
| CN108257562A (en) | 2018-07-06 |
| CN108257562B (en) | 2019-12-27 |
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