CN102044230A - Liquid crystal display device, color gamut conversion method thereof and color gamut conversion circuit - Google Patents
Liquid crystal display device, color gamut conversion method thereof and color gamut conversion circuit Download PDFInfo
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Abstract
The invention discloses a liquid crystal display device, a color gamut conversion method thereof and a color gamut conversion circuit. A data input unit is used for receiving original image gray-scale data in an original image input device and inputting the original image gray-scale data corresponding to each sub-pixel of the original image to a look-up table unit; the look-up table unit presets target image sub-pixel gray-scale compensation data corresponding to each piece of sub-pixel gray-scale data of the original image, performs addressing according to the gray-scale data of the original image sub-pixel in the data input unit, outputs the corresponding target image sub-pixel gray-scale compensation data subjected to gray-scale data compensation to a color reproduction unit; the color reproduction unit is used for aggregating the gray-scale data of each sub-pixel in a target image and then outputting the data to a data output unit; and the data output unit is used for outputting the target image. The invention can solve the problem that the liquid crystal display device cannot perform correct color reproduction.
Description
Technical field
The present invention relates to field of liquid crystal display, particularly a kind of liquid crystal indicator (LCD, LiquidCrystal Display) and gamut conversion method and color gamut conversion circuit.
Background technology
In recent years, in the display technique field, along with the fast development of flat panel display, liquid crystal indicator is because of having that volume is little, in light weight, image quality is high and driving voltage is low etc. that advantage is widely used in various information, communication and the consumption electronic products.
The image quality of liquid crystal indicator depends primarily on colour gamut (being color saturation), brightness, contrast and the resolution of its color, wherein, the colour gamut size of liquid crystal indicator is decided by to have colored filter (Color Filter), backlight (Backlight), liquid crystal (Liquid Crystal) and the polaroid (Polarizer) of red, green, blue three sub pixels.
Figure 1 shows that the 1931CIE-Yxy chromatic diagram, it uses brightness Y parameter and color coordinates x, and y describes color.As shown in Figure 1, in the 1931CIE-Yxy standard chromatic diagram, x axle chromaticity coordinate is equivalent to the ratio of red primaries component, and y axle chromaticity coordinate is equivalent to the ratio of green primary color component, and Y-axis is perpendicular to the plane at xy chromaticity coordinate place, and it represents the brightness of color.In 1931CIE-Yxy chromatic diagram shown in Figure 1, E point (shown in Figure 2) is represented white light, its coordinate is (0.33,0.33), and the color that is looped around the color space edge is a spectrum colour, wherein, the saturation degree of the white point E at center is minimum, and saturation degree is the highest on the spectrum locus line, and the spectrum locus line boundary is represented the maximum saturation of spectrum colour, the wavelength of borderline numeral spectrum colour, its profile comprise all perception tones; All monochromatic light all are positioned on the shape of a hoof spectrum locus curve, and this curve is exactly monochromatic track, and the numeral of the other mark of curve is monochromatic (or claiming spectrum colour) light wavelength value; The various actual colors of occurring in nature all are positioned at this closed curve; The physics three primary colours of selecting for use in the RGB system are on the horseshoe curve of chromatic diagram.On Y-axis, adopt the size of GTG to represent the level of brightness, GTG has been represented the level by the darkest different brightness to the brightest, the shown GTG level of Y-axis is many more, its picture effect that can present also just fine and smooth more.Liquid crystal indicator with 8bit is an example, can show 28 powers, equals 256 brightness levels, and we just are referred to as 256 GTG levels.Each pixel on the liquid crystal indicator screen combines by the red, green, blue of different brightness levels, finally forms different color point.That is to say that the color change of each point on the screen all is to be brought by the gray scale variation of three sub-pixels of red, green, blue that constitute this point in fact.
Figure 2 shows that the two dimensional surface chromatic diagram of 1931CIE-Yxy standard chromatic diagram, it has omitted the Y-axis coordinate of expression brightness.As shown in Figure 2, in liquid crystal indicator, each red, green, blue sub-pixel is respectively (xR at the chroma point of 1931CIE-Yxy standard colorimetric system, yR), (xG, yG), (xB, yB) time, its colour gamut is represented with the leg-of-mutton area that three sub-pixels of red, green, blue in the liquid crystal indicator these three points on the 1931CIE-Yxy chromatic diagram surround.That is to say that this leg-of-mutton area is big more, its effect of reproducing distinct colour element is good more, and promptly its colour gamut is big more.In the display technique field, usually with the (NTSC of National Television System Committee, National Television Standards Committee) 3 of the three primary colors-red, green and blues of specified standard form formed triangle on 1931CIE-Yxy standard colorimetric system chromatic diagram is the basis, the triangle that forms on the 1931CIE-Yxy chromatic diagram with shown three sub-pixels of red, green, blue of display is represented the colour gamut of color, i.e. color saturation with respect to the area of this NTSC standard intermediate cam shape than (abbreviate as " NTSC than ").
In the prior art, generally improve the colour gamut of liquid crystal indicator by the thickness that changes look resistance in backlight (Backlight) or the increase colored filter.The Color Range of the light source that provides when backlight is extensive more, and the colour gamut of liquid crystal indicator is just big more, and promptly its color saturation is just big more, but the cost of backlight will increase simultaneously.Under the identical situation of other conditions, the thickness of look resistance is thick more in the colored filter, then the colour gamut of colored filter is just big more, if but improve the thickness of color look resistance, and then can make the thickness of colored filter increase, need a large amount of color look resistances simultaneously, accordingly, the look resistance also can increase the absorption of light, thereby the transmittance of liquid crystal indicator is reduced, thereby can cause pixel deepening on the whole.
After the liquid crystal indicator manufacturing is finished, the colour gamut of this liquid crystal indicator (color saturation) will immobilize.In liquid crystal indicator, usually need obtain original image from the outside, generally speaking, the colour gamut of the original image that obtains from the outside can be not identical with the colour gamut of liquid crystal indicator itself, therefore, if do not adopt adequate measures to come original image is carried out suitable adjusting, liquid crystal indicator can not carry out correct color rendering to original image, and its color representation is will difference very big.
Therefore, when the colour gamut of liquid crystal indicator was different from the colour gamut of the original image that the original image input media provides, the identical color of original image colour gamut that provides with the original image input media can be provided this liquid crystal indicator was the existing problem that solves of needing.In the prior art, often with the thickness attenuation of look resistance, therefore, needing to provide a kind of can still not influence the liquid crystal indicator that the liquid crystal indicator color shows yet after the look resistive is thin for the transmittance that increases liquid crystal indicator.
Summary of the invention
In view of this, the present invention proposes a kind of liquid crystal indicator and gamut conversion method thereof and color gamut conversion circuit to solve the problem that liquid crystal indicator can not carry out correct color rendering.
For achieving the above object, the present invention by the following technical solutions:
A kind of color gamut conversion circuit, described circuit comprises: data input cell, look-up table unit, color rendering unit and data output unit, described data input cell is used for receiving the original image luma data of original image input media, and the pairing original image luma data of each sub-pixel of original image is input to the look-up table unit; Described look-up table unit has set in advance and the corresponding target image sub-pixel of each sub-pixel luma data of original image gray scale compensation data, luma data according to original image sub-pixel in the data input cell is carried out addressing, and exports the target image sub-pixel luma data of correspondence after the luma data compensation to the color rendering unit; Described color rendering unit be used for the luma data of each sub-pixel of target image converge whole after, be input to the data output unit; Described data output unit is used for the export target image.
Further, described color gamut conversion circuit is according to the colour gamut size of target image, the colour gamut of original image is divided into different zones, and, each zones of different according to the original image colour gamut, in described look-up table unit, store the corresponding respectively target image sub-pixel luma data of each sub-pixel luma data of original image of each zones of different in advance, to carry out different luma data compensation respectively.
Further, described color gamut conversion circuit is divided into two zones with the colour gamut of original image, according to described two zones of original image colour gamut, in described look-up table unit, store two kinds of different gray scale compensation data in advance, to carry out two kinds of different luma data compensation respectively.
Further, look-up table unit described in the described color gamut conversion circuit is a boundary with the border of target image colour gamut, the original image colour gamut is divided into the zone that is positioned at the target image gamut boundary and is positioned at the outer zone of target image gamut boundary to carry out the luma data compensation respectively; When the color of original image sub-pixel was positioned at target image gamut boundary regional, the target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that sets in advance in the described look-up table unit was mapped as the luma data in the original image colour gamut; And when the color of original image sub-pixel is positioned at regional outside the target image gamut boundary, the target image sub-pixel gray scale compensation data that set in advance in the described look-up table unit in the target image colour gamut pairing luma data in the pairing luma data of the boundary value of target image colour gamut.
Further, look-up table unit described in the described color gamut conversion circuit is a boundary with the border that white point extends near the presumptive area on the border of target image colour gamut, the original image colour gamut is divided into the zone on the border that is positioned at described presumptive area and is positioned at zone outside the border of described presumptive area; When the color of original image sub-pixel was positioned at border regional of described presumptive area, the target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that sets in advance in the described look-up table unit was mapped as the luma data in the original image colour gamut; And during regional outside the color of original image sub-pixel is positioned at the border of described presumptive area, described look-up table unit will carry out classification near the zone pairing luma data in the target image colour gamut between border to the border of target image colour gamut of the presumptive area on the border of target image colour gamut, and, correspond respectively to zone outside the border that is positioned at described presumptive area in the pairing luma data of original image colour gamut.
Further, presumptive area described in the described color gamut conversion circuit is for extending nearly 80% zone to the border of target image colour gamut with white point.
The present invention also provides a kind of gamut conversion method, in the color gamut conversion process, at first receives the original image luma data; Then according to each sub-pixel luma data of original image, in the look-up table unit, find out corresponding target image sub-pixel gray scale compensation data and with its output; And converge after the gray scale compensation data of each sub-pixel in the whole target image, the colour gamut of export target image object image is divided into two zones and carries out sub-pixel to original image and carry out corresponding GTG and show.
Further, the look-up table unit is a boundary with the border of target image colour gamut in the described gamut conversion method, the original image colour gamut is divided into the zone that is positioned at the target image gamut boundary and is positioned at the outer zone of target image gamut boundary to carry out the luma data compensation respectively; When the color of original image sub-pixel was positioned at target image gamut boundary regional, target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that described look-up table unit finds out was mapped as the luma data in the original image colour gamut; And when the color of original image sub-pixel is positioned at regional outside the target image gamut boundary, the target image sub-pixel gray scale compensation data that described look-up table unit finds out in the target image colour gamut pairing luma data in the pairing luma data of the boundary value of target image colour gamut.
Further, the look-up table unit is a boundary with the border that white point extends near the presumptive area on the border of target image colour gamut in the described gamut conversion method, the original image colour gamut is divided into the zone on the border that is positioned at described presumptive area and is positioned at zone outside the border of described presumptive area; When the color of original image sub-pixel was positioned at border regional of described presumptive area, the target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that finds out in the described look-up table unit was mapped as the luma data in the original image colour gamut; And during regional outside the color of original image sub-pixel is positioned at the border of described presumptive area, described look-up table unit will carry out classification near the zone pairing luma data in the target image colour gamut between border to the border of target image colour gamut of the presumptive area on the border of target image colour gamut, and, correspond respectively to zone outside the border that is positioned at described presumptive area in the pairing luma data of original image colour gamut.
The present invention also provides a kind of liquid crystal indicator, and described liquid crystal indicator comprises aforesaid any one color gamut conversion circuit.
From technique scheme as can be seen, the present invention is by being provided with the color gamut conversion circuit in liquid crystal indicator, look-up table unit in the color gamut conversion circuit has set in advance and the corresponding target image sub-pixel of each sub-pixel luma data of original image gray scale compensation data, luma data according to original image sub-pixel in the data input cell is carried out addressing, improve target image sub-pixel luma data, and then the GTG that improves the target image sub-pixel shows, thereby makes the color of target sub-pixel more near the color of original image sub-pixel.
Description of drawings
Figure 1 shows that the 1931CIE-Yxy chromatic diagram.
Figure 2 shows that 1931CIE-Yxy two dimensional surface chromatic diagram.
Figure 3 shows that target image colour gamut synoptic diagram in original image-input device provides among the present invention original image colour gamut and the liquid crystal indicator.
Figure 4 shows that the structural representation of the color gamut conversion circuit in the liquid crystal indicator of the present invention.
Figure 5 shows that the concrete transfer process synoptic diagram of red sub-pixel colour gamut among the present invention.
Embodiment
For make purpose of the present invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
For convenience of explanation, as shown in Figure 3, in the two dimensional surface chromatic diagram of 1931CIE-Yxy standard chromatic diagram shown in Figure 2, the original image colour gamut 101 that the original image input media provides (promptly importing colour gamut R1G1B1), the target image colour gamut 102 of liquid crystal indicator (promptly exporting colour gamut R2G2B2), wherein, original image colour gamut 101 (promptly importing colour gamut R1G1B1) and the most area coincidences of target image colour gamut 102 (promptly exporting colour gamut R2G2B2), partial original image colour gamut 101 zones (promptly importing colour gamut R1G1B1) is positioned at outside the target image colour gamut 102 (promptly exporting colour gamut R2G2B2).In liquid crystal indicator, if directly the original image with colour gamut size zone as shown in original image colour gamut 101 (promptly importing colour gamut R1G1B1) is input in the liquid crystal indicator, then can cause liquid crystal indicator can't realize the reproduction fully of original image color owing to liquid crystal indicator target image colour gamut 102 (promptly exporting colour gamut R2G2B2) is different from original image colour gamut 101 (promptly importing colour gamut R1G1B1), at this moment, the picture color seen of human eye will be different from the picture color of original image.In order to make the target image of being exported in the liquid crystal indicator can correctly reproduce the picture in the original image colour gamut, need proceed to the color gamut conversion of target image to original image.In the color gamut conversion process, as shown in Figure 3, the color 301,302,303 in the original image colour gamut 101 (promptly importing colour gamut R1G1B1) is compressed into the color point 301 ', 302 ', 303 ' that is similar to conllinear with white point 304 (being the E point).Need to prove, if inside triangle colour gamut 102 (being colour gamut R2G2B2) is the original image colour gamut, then the color point in the original image colour gamut 301 ', 302 ', 303 ' outwards is extended into color point 301,302,303 with the approximate conllinear of white point 304 (being the E point).
Fig. 4 is the structural representation of the color gamut conversion circuit in the liquid crystal indicator of the present invention.As shown in Figure 4, it is made up of data input cell, look-up table unit, image reproduction unit and data output unit.In specific implementation process, data input cell is used for receiving the original image luma data in the original image input media, and the pairing original image luma data of each sub-pixel in the original image is input to the look-up table unit.The original image luma data is used to represent the size of original image GTG value.In the look-up table unit, set in advance and the corresponding target image sub-pixel of original image sub-pixel luma data gray scale compensation data, luma data according to original image sub-pixel in the data input cell is carried out addressing, exports the target image sub-pixel luma data of correspondence to the color rendering unit.In the color rendering unit, the gray scale compensation data of each sub-pixel in the target image are converged input to the data output unit after whole.At the data output unit, the export target image.
Colour gamut size according to target image, the colour gamut of original image is divided into different zones, and, each zones of different according to the original image colour gamut, in the look-up table unit, store the corresponding respectively target image sub-pixel luma data of each sub-pixel luma data of original image of each zones of different in advance, to carry out different luma data compensation respectively.
In embodiments of the present invention, the colour gamut of original image can be divided into two zones, according to two zones of original image colour gamut, in the look-up table unit, store two kinds of different gray scale compensation data in advance, to carry out two kinds of different luma data compensation respectively.
Below the look-up table Elementary Function is described in detail,, is shown as example with the pairing luma data of red sub-pixel in original image and the target image as shown in Figure 3 and describes for ease of explanation.As shown in Figure 3, sub-pixel in the shown target image 102 of original image 101 and liquid crystal indicator all with 0～255 totally 256 intensity gray scale levels carry out color and show, promptly the intensity gray scale level is that 255 red sub-pixel is positioned at the R1 point in original image, and the intensity gray scale value is that 255 red sub-pixel then is positioned at the R2 point in the shown target image of liquid crystal indicator.In Fig. 5, the O point is that its intensity gray scale value is 0 color point for ater, OR1 represents that the GTG value is positioned at 0～255 red sub-pixel in the original image 101, it is 255 point that the R1 point is illustrated in GTG values in the original image colour gamut shown in Figure 2 101, it is the R1 point among Fig. 2, OR2 represents that GTG is positioned at 0～255 red sub-pixel in the target image 102, and it is 255 point that the R2 point is illustrated in GTG values in the output colour gamut 102 shown in Figure 2, i.e. the point of R2 among Fig. 2.Therefore for shown in Figure 2 from original image colour gamut 101 to target image colour gamut 102 the colour gamut pantograph ratio of red sub-pixel color R1 can be to put the length value ratio that straight line that R1 orders and O (deceiving) put the straight line that R2 orders from O (deceiving), promptly
Because it is zero point that O (deceive) puts, handle so two some R1 and R2 can be used as vector, and their amplitude is equivalent to the length of straight line.Shown in Fig. 3 and 5, when original image shows, show that its GTG then dwindles correspondence in liquid crystal indicator if carry out color with identical GTG
Doubly.For example, when liquid crystal indicator shows in the original image colour gamut R1 (255), when it will drive with the corresponding gray scale voltage of R1 (255), the color that shows in the target image for R2 (255) point, but this color only is equivalent in the original image in the colour gamut 101 of original image
Multiply by 255 GTG again and show (to be the R2 ' point on the OR1, wherein | OR2|=|OR2 ' |), therefore, the position of R2 ' on OR1 differs greatly with the R1 point that originally will show, promptly the color of color that this red sub-pixel showed in the target image 102 and original image R1 (255) falls far short.
Embodiment one:
Present embodiment is shown as example with the color of red sub-pixel and describes.In the present embodiment, the look-up table unit is a boundary with the border of target image colour gamut, the original image colour gamut is divided into the zone that is positioned at the target image gamut boundary and is positioned at the outer zone of target image gamut boundary to carry out the luma data compensation respectively.When the color of red sub-pixel in the original image was positioned at target image colour gamut 102 borders regional, promptly the GTG value of its original image was positioned at
When (R1G1B1 colour gamut), as shown in Figure 5, when the GTG of this red sub-pixel is positioned at OR2 ' zone on OR1, in the look-up table unit, set in advance gray scale compensation data corresponding, thereby make its GTG in the target image colour gamut, still keep the color of its colour gamut coordinate points in the original image colour gamut with it.As the GTG value of supposing original image is 80, suppose that this point is A1 (the R1G1B1 colour gamut is on the OR1), corresponding A 1 point, if without of the compensation of look-up table unit to luma data, its GTG value in liquid crystal indicator also is 80, and this point is A2 (the R2G2B2 colour gamut is on the OR2), for the A2 point, its GTG value 80 (R2G2B2 colour gamut) only be equivalent to GTG value in the R1G1B1 colour gamut be 60 some A1 ' (the R1G1B1 colour gamut, on the OR1, | OA2|=|OA1 ' |).In the present invention, by of the compensation of look-up table unit to luma data, make that the GTG of this sub-pixel in target image is 106, this point is A2 ' (the R2G2B2 colour gamut is on the OR2), and then the GTG of its demonstration can be equivalent to the GTG of R1G1B1 colour gamut interior 80, be about to A1 ' point and be pulled to the A1 point, therefore, the color that target image shows has reproduced the color of this sub-pixel in the original image fully, has reached desirable image display effect.
In the present invention, during regional outside red sub-pixel in the original image is positioned at target image colour gamut 102 borders, promptly the GTG value of sub-pixel is positioned in its original image
When (R1G1B1 colour gamut), as shown in Figure 5, when the GTG of this red sub-pixel is positioned at R2 ' R1 zone on OR1, in the present embodiment, the target image sub-pixel gray scale compensation data that set in advance in the look-up table unit pairing luma data in the target image colour gamut is in the pairing luma data of the boundary value of target image colour gamut, promptly adopt the maximum chrominance of liquid crystal indicator colour gamut to show, and then make this sub-pixel show with maximum chrominance.As dropping on the sub-pixel between R1 and the R2 among Fig. 3, promptly the GTG value of sub-pixel is positioned in its original image
(R1G1B1 colour gamut), as shown in Figure 5, the GTG of this red sub-pixel is positioned at R2 ' R1 zone on OR1, and directly this part GTG that red sub-pixel is shown all shows with R2 (R2G2B2 colour gamut), promptly with in the R1G1B1 colour gamut
GTG show, be equivalent to the point of the R2 ' on the OR1 among Fig. 5 (the R1G1B1 colour gamut, on the OR1, | OR2|=|OR2 ' |).This disposal route is the most simple in the present embodiment, but it can't realize that target image is to being positioned in the original image in the liquid crystal indicator
(R1G1B1 colour gamut) is that the GTG of red sub-pixel among Fig. 5 is distinguished in the color level of the parton pixel that is positioned at R2 ' R1 zone on the OR1 when high gray shows.
Embodiment two:
Present embodiment is shown as example with the color of red sub-pixel and describes.In the present embodiment, the look-up table unit is a boundary with the border that white point extends near the presumptive area on the border of target image colour gamut, the luma data compensation is carried out in the outer zone, border that the original image colour gamut is divided into the zone on the border that is positioned at described presumptive area and is positioned at described presumptive area respectively, and soon the colour gamut of target image is divided into two zones and carries out finishing after the gray scale compensation color rendering to original image.In the present embodiment, described presumptive area is for extending nearly 80% zone to the border of target image colour gamut with white point.When the color of original image sub-pixel was positioned at the zone (i.e. 80% zone) on the border of described presumptive area, the target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that sets in advance in the look-up table unit was mapped as the luma data in the original image colour gamut.Zone outside the color of original image sub-pixel is positioned at the border of described presumptive area is (promptly outside 80% the zone, 80%-100% just) time, the look-up table unit will carry out classification near the zone pairing luma data in the target image colour gamut between border to the border of target image colour gamut of the presumptive area on the border of target image colour gamut, and, correspond respectively to zone outside the border that is positioned at described presumptive area in the pairing luma data of original image colour gamut.Need to prove that this dividing region is not limited to 80% zone, also can adopt 75% or the area dividing of other number percents.As shown in Figure 5, the GTG value that O is ordered is 0, and the GTG value of R1 is 255 (in the original image colour gamuts 101), and the GTG value of R2 also is 255 (in the target image colour gamuts 102), OC2=80%OR2.On OR1, | OR2 ' |=| OR2|, promptly in colour gamut shown in Figure 3, R2 ' in the original image colour gamut 101 and the R2 that exports in the colour gamut 102 are positioned at same coordinate points.The GTG of R2 ' in original image colour gamut 101 is
Promptly
If the look-up table unit is to the compensation of luma data in the present embodiment, its GTG value in liquid crystal indicator target image output colour gamut also is
Corresponding to the point of the C2 among the OR2, on OR1, order | OC1|=|OC2|.In the present invention, when red sub-pixel in the original image is arranged in the grey-scale range of target image colour gamut 102 OC2, be when the GTG of red sub-pixel is arranged in the zone of OR1 OC1 in the original image, in the look-up table unit, set in advance compensation luma data corresponding, thereby make its GTG in target image, still keep the color of its colour gamut coordinate points in original image with it.As the GTG value of supposing original image is 80, suppose that this point is A1 (the R1G1B1 colour gamut is in the last OC1 of the OR1 zone), corresponding A 1 point, if compensation without the GTG driving voltage of look-up table unit, its GTG value in liquid crystal indicator also is 80, and this point is A2 (the R2G2B2 colour gamut is in the last OC2 of the OR2 zone), for the A2 point, its GTG value 80 (R2G2B2 colour gamut) only be equivalent to GTG in the R1G1B1 colour gamut be 60 some A1 ' (the R1G1B1 colour gamut, on the OR1, | OA2|=|OA1 ' |).In the present invention, the compensation of the luma data by the look-up table unit, make that the GTG value of this sub-pixel in target image is 106, this point is A2 ' (the R2G2B2 colour gamut is in the last OC2 of the OR2 zone), and then the GTG of its demonstration can be equivalent to the GTG of R1G1B1 colour gamut interior 80, be about to A1 ' point and be pulled to the A1 point, therefore, the color that target image shows has reproduced the color of this sub-pixel in the original image fully, has reached desirable image display effect.
In the present embodiment, in the OC2 zone in target image, OC2 only is equivalent to 80% of OR2, the original image pixels color in the last OC1 zone of original image OR1 is reproduced in the OC2 zone fully in the target image, utilizes the original image pixels color in the last C1R1 zone of close approximation layering demonstration original image OR1 in the C2R2 zone remaining in the target image.As shown in Figure 5, the C1R1 zone comprises C1R2 ' and two zones of R2 ' R1, it is corresponding to 20% zone of ordering near R2 in along the white E point at center to R2 among Fig. 3 and the zone between the R2R1, when on OR1, being positioned at the zone of C1R1, in the target image of correspondence, also have this moment the GTG of C2R2 section correspondingly to show.In order to make target image can better reproduce the color of original image, can guarantee again be positioned at the color that target image output colour gamut 102 can layering demonstration original image colour gamut 101 high-orders, in the present embodiment, applying overdrive voltage by the look-up table unit will be positioned at GTG demonstration that GTG that OR2 goes up the C2R2 section and OR1 go up C1R1 to carry out classification in proportion corresponding.Be that B1 is elaborated with GTG in the original image below, the B1 point is positioned at the C1R1 section.At this moment,, go to drive, can make undoubtedly that then the color difference of target image and original image is more obvious according to the gray scale voltage of original luma data correspondence if without the compensation of the luma data of look-up table unit.In the present embodiment, the compensation of the luma data of this part that sets in advance by the look-up table unit makes the color difference of target image and original image can dwindle a lot, and then can carry out the color rendering of original image preferably.In the present embodiment, the GTG that is arranged in the C1R1 zone in the original image 101 and target image 102 are positioned at the GTG in C2R2 zone, and classification is corresponding each other, R2 (255 in the original image 101, the R2G2B2 colour gamut) R1 (255 in GTG and the target image 102, the R1G1B1 colour gamut) GTG correspondence, in the original image red sub-pixel be the GTG of C1 through the compensation of the luma data in the look-up table after, its GTG is the GTG that the C2 on the OR2 is ordered.Reproduce color in the original image 101 in the target image 102 more really in order to make, to be positioned at the corresponding sub-pixel in C1R1 zone and carry out luma data compensation in the look-up table unit in the target image 102 with in the original image 101, and then make it better reproduce color of original image.For example, suppose that the GTG value is 200 in the original image 101, suppose that this point is B1 (R1G1B1 colour gamut, in the last C1R1 of the OR1 zone), the sub-pixel that corresponding B1 is ordered drops among Fig. 3 between the R1 and R2, because it has exceeded the color indication range of liquid crystal indicator, therefore, can not reproduce with original image 101 in the same color, if compensation without look-up table unit GTG driving voltage, its GTG value in liquid crystal indicator also is 200 (R2G2B2 colour gamuts), corresponding B2 point (the R2G2B2 colour gamut is on the OR2) is 160 some B1 ' (R1G1B1 colour gamut but GTG value 200 (R2G2B2 colour gamut) only is equivalent to the interior GTG value of R1G1B1 colour gamut, on the OR1, | OB2|=|OB1 ' |).In the present invention, by the look-up table unit its luma data is compensated, make that the GTG value of this sub-pixel in target image is 230, this point is B2 ' (R2G2B2 colour gamut, on the OR2), then the GTG of its demonstration can be equivalent to the GTG value of R1G1B1 colour gamut interior 180, this point is B1 " (R1G1B1 colour gamut; wherein, | OB2 ' |=| OB1 " |).In the present embodiment, though it can't reproduce the color of 200 (R1G1B1 colour gamuts) in the original image, though promptly can't be pulled to the B1 point from B1 ' point, but the GTG driving voltage that applies by the look-up table unit, its originally the color of the GTG 160 in the R1G1B1 colour gamut its GTG brought up in the R1G1B1 colour gamut 180 GTG by overdriving, be about to B1 ' point and be pulled to B1 " point; therefore; it has further dwindled the heterochromia in target image and the original image, its color rendering degree to original image further strengthens.
In sum, the invention provides a kind of liquid crystal indicator of in the liquid crystal indicator of fixing colour gamut, realizing the color gamut conversion circuit of different color gamut conversion and adopting this color gamut conversion circuit.Because it need not by changing backlight, perhaps the thickness with look resistance in the colored filter increases, and therefore, it has reduced corresponding cost, and has avoided increasing the problem that transmitance that color resistance of color filter thickness causes descends.In real world applications, even for the thickness attenuation of the penetrance that improves liquid crystal indicator with look resistance in the colored filter, can not cause because the attenuation of look resistance thickness makes the smaller color of liquid crystal indicator yet, and then problem that can not fine demonstration original image color.
The above, it is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong to the scope of technical solution of the present invention according to technical spirit of the present invention.
Claims (10)
1. color gamut conversion circuit, it is characterized in that: it comprises data input cell, look-up table unit, color rendering unit and data output unit,
Described data input cell is used for receiving the original image luma data of original image input media, and the pairing original image luma data of each sub-pixel of original image is input to described look-up table unit;
Described look-up table unit, set in advance and the corresponding target image sub-pixel of each sub-pixel luma data of original image gray scale compensation data, luma data according to original image sub-pixel in the data input cell is carried out addressing, and exports the target image sub-pixel gray scale compensation data after the luma data compensation of correspondence to described color rendering unit;
Described color rendering unit, be used for the gray scale compensation data of each sub-pixel of target image converge whole after, be input to described data output unit; And
Described data output unit is used for the export target image.
2. color gamut conversion circuit as claimed in claim 1 is characterized in that,
Colour gamut size according to target image, the colour gamut of original image is divided into different zones, and, each zones of different according to the original image colour gamut, in described look-up table unit, store the corresponding respectively target image sub-pixel luma data of each sub-pixel luma data of original image of each zones of different in advance, to carry out different luma data compensation respectively.
3. color gamut conversion circuit as claimed in claim 2 is characterized in that,
The colour gamut of original image is divided into two zones,, in described look-up table unit, stores two kinds of different gray scale compensation data in advance, to carry out two kinds of different luma data compensation respectively according to described two zones of original image colour gamut.
4. color gamut conversion circuit as claimed in claim 3 is characterized in that,
Described look-up table unit is a boundary with the border of target image colour gamut, the original image colour gamut is divided into the zone that is positioned at the target image gamut boundary and is positioned at the outer zone of target image gamut boundary to carry out the luma data compensation respectively;
When the color of original image sub-pixel was positioned at target image gamut boundary regional, the target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that sets in advance in the described look-up table unit was mapped as the luma data in the original image colour gamut; And
When the color of original image sub-pixel is positioned at regional outside the target image gamut boundary, the target image sub-pixel gray scale compensation data that set in advance in the described look-up table unit in the target image colour gamut pairing luma data in the pairing luma data of the boundary value of target image colour gamut.
5. color gamut conversion circuit as claimed in claim 3 is characterized in that,
Described look-up table unit is a boundary with the border that white point extends near the presumptive area on the border of target image colour gamut, the original image colour gamut is divided into the zone on the border that is positioned at described presumptive area and is positioned at zone outside the border of described presumptive area;
When the color of original image sub-pixel was positioned at border regional of described presumptive area, the target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that sets in advance in the described look-up table unit was mapped as the luma data in the original image colour gamut; And
During regional outside the color of original image sub-pixel is positioned at the border of described presumptive area, described look-up table unit will carry out classification near the zone pairing luma data in the target image colour gamut between border to the border of target image colour gamut of the presumptive area on the border of target image colour gamut, and, correspond respectively to zone outside the border that is positioned at described presumptive area in the pairing luma data of original image colour gamut.
6. color gamut conversion circuit as claimed in claim 5 is characterized in that,
Described presumptive area is for extending nearly 80% zone to the border of target image colour gamut with white point.
7. a gamut conversion method is characterized in that,
Receive the original image luma data;
According to each sub-pixel luma data of original image, in the look-up table unit, find out corresponding target image sub-pixel gray scale compensation data and with its output; And
After the gray scale compensation data of each sub-pixel in the target image are put in order in remittance, the export target image.
8. gamut conversion method as claimed in claim 7 is characterized in that,
Described look-up table unit is a boundary with the border of target image colour gamut, the original image colour gamut is divided into the zone that is positioned at the target image gamut boundary and is positioned at the outer zone of target image gamut boundary to carry out the luma data compensation respectively;
When the color of original image sub-pixel was positioned at target image gamut boundary regional, target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that described look-up table unit finds out was mapped as the luma data in the original image colour gamut; And
When the color of original image sub-pixel is positioned at regional outside the target image gamut boundary, the target image sub-pixel gray scale compensation data that described look-up table unit finds out in the target image colour gamut pairing luma data in the pairing luma data of the boundary value of target image colour gamut.
9. gamut conversion method as claimed in claim 7 is characterized in that,
Described look-up table unit is a boundary with the border that white point extends near the presumptive area on the border of target image colour gamut, the original image colour gamut is divided into the zone on the border that is positioned at described presumptive area and is positioned at zone outside the border of described presumptive area;
When the color of original image sub-pixel was positioned at border regional of described presumptive area, the target image sub-pixel gray scale compensation data pairing luma data in the target image colour gamut that finds out in the described look-up table unit was mapped as the luma data in the original image colour gamut; And
During regional outside the color of original image sub-pixel is positioned at the border of described presumptive area, described look-up table unit will carry out classification near the zone pairing luma data in the target image colour gamut between border to the border of target image colour gamut of the presumptive area on the border of target image colour gamut, and, correspond respectively to zone outside the border that is positioned at described presumptive area in the pairing luma data of original image colour gamut.
10. a liquid crystal indicator is characterized in that, described liquid crystal indicator comprises as each described color gamut conversion circuit in the claim 1 to 6.
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