CN103000145A - Multi-primary-color liquid crystal display and color signal conversion device and color signal conversion method thereof - Google Patents
Multi-primary-color liquid crystal display and color signal conversion device and color signal conversion method thereof Download PDFInfo
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Abstract
The invention relates to a multi-primary-color liquid crystal display and a color signal conversion device and a color signal conversion method thereof, and particularly relates to a color signal conversion method suitable for multi-primary-color liquid crystal displays. The color signal conversion method includes converting RGB (red, green and blue) color input signals into YUV color signals; compensating chroma signals of the YUV color signals according to the minimum color signals of the RGB color input signals and the brightness signals of the YUV color signals to output compensated YUV color signals, and providing W color output signals according to the minimum color signals of the RGB color input signals; and converting the compensated YUV color signals into the RGB color output signals. The color signals conversion device is used for the multi-primary-color liquid crystal display.
Description
Technical field
The invention relates to a kind of plane display technique, and particularly relevant for a kind of many primary colors liquid crystal display and chrominance signal conversion equipment and method.
Background technology
In the evolution of liquid crystal display, the demand of high brightness (high brightness) is more and more important.In order to obtain high brightness, can increase drive current so that backlight module (backlight module) provides the more backlight of high brightness, or when pixel design, increase the aperture opening ratio (aperture ratio, AR) of picture element.Yet, with regard to the former, will cause system power consumption to increase; In addition, with regard to the latter, the increase of picture element aperture opening ratio has its design limit, and easily causes the problems such as variation on circuit parasitic effect and the processing procedure.
For improving above-mentioned shortcoming, the development of many primary colors liquid crystal display immediately in response to and give birth to, that is: the extra sub-picture element of a W (in vain) that increases in the single picture element that tradition is comprised of RGB (RGB) three sub-picture elements.Thus, can promote mean flow rate and the contrast of liquid crystal display integral body.Yet traditional many primary colors liquid crystal display is still kept and is received RGB (RGB) color input signal, and the minimum chrominance signal (min{R, G, B}) in the taking-up rgb color input signal is to drive the sub-picture element of W in the picture element.
That is the R color input signal in the rgb color input signal is in order to drive the sub-picture element of R in the picture element; G color input signal in the rgb color input signal is in order to drive the sub-picture element of G in the picture element; B color input signal in the rgb color input signal is in order to drive the sub-picture element of B in the picture element; And the minimum chrominance signal (min{R, G, B}) in the rgb color input signal is in order to drive the sub-picture element of W in the picture element.
Thus, the type of drive of traditional many primary colors liquid crystal display not only can so that the chroma of many primary colors liquid crystal display descends, but also can cause the excitation of the shown picture of many primary colors liquid crystal display descend (that is picture is partially white).
Summary of the invention
In view of this, the invention provides a kind of many primary colors liquid crystal display and chrominance signal conversion equipment and method, the problem of addressing in order to solve prior art.
One embodiment of the invention provide a kind of chrominance signal conversion equipment that is suitable for many primary colors liquid crystal display, and it comprises: the first gamut conversion unit, chroma compensating unit, and the second gamut conversion unit.The first gamut conversion unit is in order to receiving RGB (RGB) color input signal, and converts the rgb color input signal to YUV (brightness-chroma) chrominance signal.The chroma compensating unit couples the first gamut conversion unit, in order to according to the minimum chrominance signal in the rgb color input signal and brightness (Y) signal in the YUV chrominance signal and the chroma in the YUV chrominance signal (UV) signal is compensated, compensate YUV chrominance signal later in order to output, and provide W (in vain) color output signal according to the minimum chrominance signal in the rgb color input signal.The second gamut conversion unit couples the chroma compensating unit, compensate YUV chrominance signal later in order to receive, and the YUV chrominance signal after will compensating converts the rgb color output signal to.
In one embodiment of the invention, the chrominance signal conversion equipment of carrying also comprises: the output amending unit, it couples chroma compensating unit and the second gamut conversion unit, be associated with a plurality of parameters and the W color output signal of rgb color output signal in order to basis, and determine whether W color output signal and rgb color output signal to be revised, and (red, green, blue and white) color output signal of exporting RGBW according to this.
Another embodiment of the present invention provides a kind of chrominance signal conversion method that is suitable for many primary colors liquid crystal display, and it comprises: convert RGB (RGB) color input signal to YUV (brightness-chroma) chrominance signal; According to the minimum chrominance signal in the rgb color input signal and brightness (Y) signal in the YUV chrominance signal and the chroma in the YUV chrominance signal (UV) signal is compensated, compensate YUV chrominance signal later in order to output, and provide W (in vain) color output signal according to the minimum chrominance signal in the rgb color input signal; And the YUV chrominance signal after will compensating converts the rgb color output signal to.
In one embodiment of the invention, the chrominance signal conversion method of carrying also comprises: according to a plurality of parameters that are associated with the rgb color output signal and W color output signal, and determine whether W color output signal and rgb color output signal to be revised, and (red, green, blue and white) color output signal of exporting RGBW according to this.
An again embodiment of the present invention provides a kind of many primary colors liquid crystal display, and it comprises: display panels, aforementioned chrominance signal conversion equipment, the drive unit of carrying, and backlight module.Display panels has at least one picture element that is comprised of red, green, blue and Bai Sizi picture element.Drive unit couples display panels and chrominance signal conversion equipment, the W color output signal and the rgb color output signal that come from the chrominance signal conversion equipment in order to basis, perhaps RGBW color output signal is to drive red, green, blue and the Bai Sizi picture element of picture element.Backlight module is in order to provide display panels required backlight.
Based on above-mentioned, the present invention according to the minimum chrominance signal in the rgb color input signal with via brightness (Y) signal in the YUV chrominance signal after the color gamut conversion the chroma of many primary colors liquid crystal display being adjusted/is compensated (chroma that this measure can promote many primary colors liquid crystal display), and moderately rgb color output signal and W color output signal are revised to promote the excitation of the shown picture of many primary colors liquid crystal display.
Will be appreciated that above-mentioned general description and following embodiment only are exemplary and illustrative, it can not limit the scope that institute of the present invention wish is advocated.
Description of drawings
Below appended graphic be the part of instructions of the present invention, illustrated example embodiment of the present invention, appended graphic description with instructions illustrates principle of the present invention.
Fig. 1 illustrates the synoptic diagram of the many primary colors liquid crystal display (multi-primary color LCD) 10 into one embodiment of the invention.
Fig. 2 illustrates the synoptic diagram into the chrominance signal conversion equipment 103 of one embodiment of the invention.
Fig. 3 illustrates the synoptic diagram into the output amending unit 207 of one embodiment of the invention.
Fig. 4 illustrates the synoptic diagram into the parameter generator 301 of one embodiment of the invention.
Fig. 5 illustrates the synoptic diagram into the judgement flow process that is associated with preset maximum value (that is, 255), predetermined minimum (that is, 0), W color output signal Wo ' and parameter Max, Min, V1, V2, V3 of one embodiment of the invention.
Fig. 6 illustrates the chrominance signal conversion method process flow diagram that is suitable for many primary colors liquid crystal display for one embodiment of the invention.
Fig. 7 illustrates the synoptic diagram that the chroma in the YUV chrominance signal (UV) signal is compensated for one embodiment of the invention.
Fig. 8 illustrates the synoptic diagram into the output RGBW color output signal of one embodiment of the invention.
Fig. 9 illustrates the synoptic diagram that is associated with a plurality of parameters of rgb color output signal for the acquisition of one embodiment of the invention.
[main element symbol description]
10: many primary colors liquid crystal display;
101: display panels;
103: the chrominance signal conversion equipment;
105: drive unit;
107: backlight module;
201: the first gamut conversion unit;
203: the chroma compensating unit;
205: the second gamut conversion unit;
207: the output amending unit;
209: get the minimum value unit;
211: divider;
213: first adder;
215: second adder;
217: the first multipliers;
219: the second multipliers;
301: parameter generator;
303: the steering logic unit;
305: revise arithmetic element;
401: get the maximal value unit;
403: get the minimum value unit;
405: subtracter;
407: the first unit that take absolute value;
409: the second unit that take absolute value;
BUF1: the first impact damper;
BUF2: the second impact damper;
Pix: picture element;
P
R: the red pieces picture element;
P
G: green sub-picture element;
P
B: blue sub-picture element;
P
W: the white chessman picture element;
Ri, Gi, Bi:RGB (RGB) color input signal;
Ro, Go, Bo, Wo:RGBW (red, green, blue and white) color output signal;
Wo ': W (in vain) color output signal;
Ro ', Go ', Bo ': rgb color output signal;
Y, U, V:YUV (brightness-chroma) chrominance signal;
Y ', U ', V ': compensation YUV chrominance signal later;
Y ': compensate for brightness signal;
U ': compensation U colour difference signal;
V ': compensation V colour difference signal;
ADJ_V: adjustable V colour difference signal;
ADJ_U: adjustable U colour difference signal;
COMP: compensation ratio;
Min{Ri, Gi, the minimum chrominance signal among Bi}:RGB color input signal Ri, Gi, the Bi
Max, Min, V1～V3: parameter;
C1～C7: Rule of judgment;
M0～M3: modification model;
S601～S613: each step of chrominance signal conversion method process flow diagram that is suitable for many primary colors liquid crystal display;
S603-1～S603-9: each step that the chroma in the YUV chrominance signal (UV) signal is compensated;
S613-1～S613-5: each step of output RGBW color output signal;
S613-1-1～S613-1-9: acquisition is associated with each step of a plurality of parameters of rgb color output signal.
Embodiment
Now will in detail with reference to example embodiment of the present invention, the example of described example embodiment be described in the accompanying drawings.In addition, all possibility parts, the assembly of use same numeral in graphic and embodiment/the identical or similar portions of member representative.
Fig. 1 illustrates the synoptic diagram of the many primary colors liquid crystal display (multi-primary color LCD) 10 into one embodiment of the invention.Please refer to Fig. 1, many primary colors liquid crystal display 10 comprises: display panels (LCD panel) 101, chrominance signal conversion equipment (color signal conversion device) 103, drive unit (driving device) 105 and backlight module (backlight module) 107.
Chrominance signal conversion equipment 103 is in order to receiving RGB (RGB) color input signal Ri, Gi, Bi, and changes to provide RGBW (red, green, blue and white) color output signal Ro, Go, Bo, Wo to rgb color input signal Ri, Gi, Bi.Base this, drive unit 105 couples display panels 101 and chrominance signal conversion equipment 103, in order to according to RGBW color output signal Ro, Go, Bo, Wo to drive red, green, blue and the Bai Sizi picture element P of picture element Pix
R, P
G, P
B, P
WIn present embodiment, drive unit 105 can be the integral chip (integrated IC) that is combined with the complex functions such as time schedule controller (timing controller, T-con), scanner driver (scan driver) and source electrode driver (source driver).
In this, look back content that prior art discloses as can be known, traditional many primary colors liquid crystal display is still kept and is received the rgb color input signal, and takes out the minimum chrominance signal (min{R in the rgb color input signal, G, B}) to drive the sub-picture element of W (in vain) in the picture element.Thus, the type of drive of traditional many primary colors liquid crystal display not only can so that the chroma of many primary colors liquid crystal display descends, but also can cause the excitation of the shown picture of many primary colors liquid crystal display descend (that is picture is partially white).
In view of this, present embodiment can solve the problem that prior art is addressed by chrominance signal conversion equipment 103.Clearer, Fig. 2 illustrates the synoptic diagram into the chrominance signal conversion equipment 103 of one embodiment of the invention.Please merge with reference to Fig. 1 and Fig. 2, chrominance signal conversion equipment 103 comprises: the first gamut conversion unit (color space conversion unit) 201, chroma compensating unit (chroma compensation unit) the 203, second gamut conversion unit 205, and output amending unit (output calibration unit) 207.Wherein, (RGB → YUV) 201 is in order to receiving rgb color input signal Ri, Gi, Bi, and converts rgb color input signal Ri, Gi, Bi to YUV (brightness-chroma) chrominance signal Y, U, V for the first gamut conversion unit.
Clearer, chroma compensating unit 203 comprises: get minimum value unit (minimum value obtaining unit) 209, divider 211, first adder 213, second adder 215, the first multiplier 217, the second multiplier 219, the first impact damper BUF1, and the second impact damper BUF2.Wherein, get minimum value unit 209 in order to receiving rgb color input signal Ri, Gi, Bi, and take out the minimum chrominance signal among rgb color input signal Ri, Gi, the Bi, that is min{Ri, Gi, Bi}.
The first multiplier 217 couples the first gamut conversion unit 201 and first adder 213, carry out multiplying in order to the original V colour difference signal V in the chroma signals (UV) of the first accumulated value (COMP+ADJ_V) that first adder 213 is exported and YUV chrominance signal Y, U, V, compensate V colour difference signal V ' in order to export one, that is: (COMP+ADJ_V) * V.The second multiplier 219 couples the first gamut conversion unit 201 and second adder 215, carry out multiplying in order to the original U colour difference signal U in the chroma signals (UV) of the second accumulated value (COMP+ADJ_U) that second adder 213 is exported and YUV chrominance signal Y, U, V, compensate the U colour difference signal in order to export one, that is: (COMP+ADJ_U) * U.
The first impact damper BUF1 couples the first gamut conversion unit 201, in order to receive and to cushion the luminance signal (Y) among YUV chrominance signal Y, U, the V, in order to export a compensate for brightness signal Y '.In present embodiment, compensate for brightness signal Y ', compensation V colour difference signal V ' and compensation U colour difference signal U ' form compensation YUV chrominance signal Y ', U ', V ' later.The second impact damper BUF2 couples and gets minimum value unit 209, in order to receive and buffering rgb color input signal Ri, Gi, Bi in minimum chrominance signal (that is min{Ri, Gi, Bi}), in order to W color output signal Wo ' (that is Wo '=min{Ri, Gi, Bi}) to be provided.
On the other hand, the second gamut conversion unit (YUV → RGB) 205 couple chroma compensating unit 203, compensate YUV chrominance signal Y ', U ', V ' later in order to receive, and YUV chrominance signal Y ', U ', V ' after will compensating convert rgb color output signal Ro ', Go ', Bo ' to.The base this, output amending unit 207 couples chroma compensating unit 203 and the second gamut conversion unit 205, be associated with a plurality of parameters and the W color output signal Wo ' of rgb color output signal Ro ', Go ', Bo ' in order to basis, and determine whether W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are revised, and export according to this RGBW color output signal Ro, Go, Bo, Wo.
Clearer, Fig. 3 illustrates the synoptic diagram into the output amending unit 207 of one embodiment of the invention.Please merge with reference to Fig. 1～Fig. 3, output amending unit 207 comprises: parameter generator 301, steering logic unit 303, and revise arithmetic element 305.Parameter generator 301 couples the second gamut conversion unit 205, in order to receiving rgb color output signal Ro ', Go ', Bo ', and obtains to be associated with according to this rgb color output signal Ro ', a plurality of parameter Max, the Min of Go ', Bo ', V1, V2, V3.
In present embodiment, as shown in Figure 4, it illustrates the synoptic diagram into the parameter generator 301 of one embodiment of the invention.Please refer to Fig. 4, parameter generator 301 comprises: gets maximal value unit (maximum value obtaining unit) 401, gets minimum value unit 403, subtracter 405, first takes absolute value unit (absolute value obtaining unit) 407, and second unit 409 that takes absolute value.Get maximal value unit 401 and couple the second gamut conversion unit 205, in order to receiving rgb color output signal Ro ', Go ', Bo ', and take out maximum colours signal among rgb color output signal Ro ', Go ', the Bo ' (that is, max{Ro ', Go ', Bo ' }) with as parameter Max.
Get minimum value unit 403 and couple the second gamut conversion unit 205, in order to receiving rgb color output signal Ro ', Go ', Bo ', and take out minimum chrominance signal among rgb color output signal Ro ', Go ', the Bo ' (that is, min{Ro ', Go ', Bo ' }) with as parameter Min.Subtracter 405 couples gets maximal value unit 401, in order to a preset maximum value (for example: 255, take picture element resolution as 8 situation as example, but be not restricted to this) carry out subtraction with maximum colours signal (max{Ro ', Go ', Bo ' }) among the rgb color output signal Ro ', Go ', Bo ', in order to export a difference (that is, 255-max{Ro ', Go ', Bo ' }) with as V parameter 1.First unit 407 that takes absolute value couples subtracter 405, takes absolute value with as V parameter 3 in order to difference that subtracter 405 is exported (255-max{Ro ', Go ', Bo ' }).Second unit 409 that takes absolute value couples and gets minimum value unit 403, in order to the minimum chrominance signal among rgb color output signal Ro ', Go ', the Bo ' (min{Ro ', Go ', Bo ' }) is taken absolute value with as V parameter 2.
On the other hand, steering logic unit 303 couples chroma compensating unit 203 and parameter generator 301, in order to determine whether W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' to be revised, and a modification model is provided according to this according to W color output signal Wo ' and parameter Max, Min, V1, V2, the V3 that parameter generator 301 obtains.In present embodiment, steering logic unit 303 can be also according to preset maximum value (namely, 255), predetermined minimum (for example: 0, take picture element resolution as 8 situation as example, but be not restricted to this), W color output signal Wo ' and parameter Max, Min, V1, V2, V3 be associated one judge flow process and determine whether W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are revised, and provide according to this a modification model.
The base this, revise arithmetic element 305 and couple chroma compensating unit 203, the second gamut conversion unit 205 and steering logic unit 303, in order to the modification model that provides according to steering logic unit 303 W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo.
Clearer, Fig. 5 illustrates the synoptic diagram into the judgement flow process that is associated with preset maximum value (that is, 255), predetermined minimum (that is, 0), W color output signal Wo ' and parameter Max, Min, V1, V2, V3 of one embodiment of the invention.Please refer to Fig. 5, if parameter Max is judged greater than preset maximum value (that is, 255) in steering logic unit 303, and parameter Min is less than predetermined minimum (that is, 0); Perhaps, judge parameter Max less than or equal to preset maximum value (namely, 255), and parameter Min more than or equal to predetermined minimum (namely, 0) (that is satisfying Rule of judgment C1), then steering logic unit 303 can provide modification model M0 that expression do not do any change to revising arithmetic element 305.Thus, revise arithmetic element 305 and namely according to modification model M0 W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to exporting RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro ' ± 0; Go=Go ' ± 0; Bo=Bo ' ± 0 and Wo=Wo ' ± 0.
Under the condition that does not satisfy Rule of judgment C1, if parameter Min is judged greater than predetermined minimum (namely in steering logic unit 303,0) (that is not satisfying Rule of judgment C2), and W color output signal Wo ' is greater than V parameter 3 (that is satisfying Rule of judgment C3), and then steering logic unit 303 can provide the modification model M1 that is expressed as the first compensation to revising arithmetic element 305.Thus, revise arithmetic element 305 and namely according to the first modification model M1 that compensates W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to exporting RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+V1; Go=Go '+V1; Bo=Bo '+V1 and Wo=Wo '-V1.
Under the condition that does not satisfy Rule of judgment C1, if parameter Min is judged greater than predetermined minimum (namely in steering logic unit 303,0) (that is not satisfying Rule of judgment C2), and W color output signal Wo ' is not less than V parameter 3 (that is satisfying Rule of judgment C3), and then steering logic unit 303 can provide the modification model M2 that is expressed as the second compensation to revising arithmetic element 305.Thus, revise arithmetic element 305 and namely according to the second modification model M2 that compensates W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to exporting RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '-Min; Go=Go '-Min; Bo=Bo '-Min and Wo=Wo '+Min.
Under the condition that does not satisfy Rule of judgment C1, if parameter Min is judged less than predetermined minimum (namely in steering logic unit 303,0) (that is satisfying Rule of judgment C2), V parameter 2 greater than V parameter 1 (that is not satisfying Rule of judgment C4), W color output signal Wo ' less than V parameter 2 (that is not satisfying Rule of judgment C5), and W color output signal Wo ' is less than V parameter 1 (that is satisfying Rule of judgment C6), and then steering logic unit 303 can provide the modification model M3 that is expressed as the 3rd compensation to revising arithmetic element 305.Thus, revise arithmetic element 305 and namely according to the 3rd modification model M3 that compensates W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to exporting RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+Wo '; Go=Go '+Wo '; Bo=Bo '+Wo ' and Wo=Wo '-Wo '.
Under the condition that does not satisfy Rule of judgment C1, if parameter Min is judged less than predetermined minimum (namely in steering logic unit 303,0) (that is satisfying Rule of judgment C2), V parameter 2 greater than V parameter 1 (that is not satisfying Rule of judgment C4), W color output signal Wo ' less than V parameter 2 (that is not satisfying Rule of judgment C5), and W color output signal Wo ' is not greater than V parameter 1 (that is satisfying Rule of judgment C6), and then steering logic unit 303 can provide the modification model M1 that is expressed as the first compensation to revising arithmetic element 305.Thus, revise arithmetic element 305 and namely according to the first modification model M1 that compensates W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to exporting RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+V1; Go=Go '+V1; Bo=Bo '+V1 and Wo=Wo '-V1.
Under the condition that does not satisfy Rule of judgment C1, if parameter Min is judged less than predetermined minimum (namely in steering logic unit 303,0) (that is satisfying Rule of judgment C2), V parameter 2 be not greater than V parameter 1 (that is satisfying Rule of judgment C4), and W color output signal Wo ' is greater than V parameter 2 (that is satisfying Rule of judgment C5), and then steering logic unit 303 can provide the modification model M1 that is expressed as the first compensation to revising arithmetic element 305.Thus, revise arithmetic element 305 and namely according to the first modification model M1 that compensates W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to exporting RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+V1; Go=Go '+V1; Bo=Bo '+V1 and Wo=Wo '-V1.
Under the condition that does not satisfy Rule of judgment C1, if parameter Min is judged less than predetermined minimum (namely in steering logic unit 303,0) (that is satisfying Rule of judgment C2), V parameter 2 are less than V parameter 1 (that is satisfying Rule of judgment C4), and W color output signal Wo ' is not less than V parameter 2 (that is satisfying Rule of judgment C7), and then steering logic unit 303 can provide the modification model M3 that is expressed as the 3rd compensation to revising arithmetic element 305.Thus, revise arithmetic element 305 and namely according to the 3rd modification model M3 that compensates W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to exporting RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+Wo '; Go=Go '+Wo '; Bo=Bo '+Wo ' and Wo=Wo '-Wo '.
Under the condition that does not satisfy Rule of judgment C1, if parameter Min is judged less than predetermined minimum (namely in steering logic unit 303,0) (that is satisfying Rule of judgment C2), V parameter 2 are less than V parameter 1 (that is satisfying Rule of judgment C4), and W color output signal Wo ' is greater than V parameter 2 (that is satisfying Rule of judgment C7), and then steering logic unit 303 can provide the modification model M2 that is expressed as the second compensation to revising arithmetic element 305.Thus, revise arithmetic element 305 and namely according to the second modification model M2 that compensates W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out calculation process, in order to exporting RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '-Min; Go=Go '-Min; Bo=Bo '-Min and Wo=Wo '+Min.
Can clearly learn based on judgement flow process shown in Figure 5, because chroma compensating unit 203 mainly is in order to the chroma signals (UV) (this measure can promote the chroma of many primary colors liquid crystal display 10) among compensation/adjustment YUV chrominance signal Y, U, the V, so (after the conversion of YUV → RGB) 205, rgb color output signal Ro ', Go ', Bo ' might exceed its expressible upper limit (that is greater than preset maximum value 255) or lower limit (that is less than predetermined minimum 0) via the second gamut conversion unit again.Base this, if will exceed among rgb color output signal Ro ', Go ', the Bo ' the directly deletion of its expressible part, will cause the proportion of rgb color output signal Ro ', Go ', Bo ' to produce deviation and cause cross-color.
In view of this, present embodiment sees through especially output amending unit 207 and comes to exceed among modified R GB color output signal Ro ', Go ', the Bo ' its expressible part (that is greater than preset maximum value 255 and less than the part of predetermined minimum 0) in mechanism/mode of adjusting W color output signal Wo '.Thus, moderately rgb color output signal Ro ', Go ', Bo ' and W color output signal Wo ' are revised by output amending unit 207, can promote significantly the excitation of the shown picture of many primary colors liquid crystal display 10.
Certainly, if can guarantee via the second gamut conversion unit (after the conversion of YUV → RGB) 205, rgb color output signal Ro ', Go ', Bo ' can't exceed its expressible upper limit (that is greater than preset maximum value 255) or lower limit (that is less than predetermined minimum 0), then exporting amending unit 207 can omit, and directly can rgb color output signal Ro ', Go ', Bo ' be used as RGBW color output signal Ro, Go, Bo, Wo with W color output signal Wo '.
Disclose/content of teaching based on the various embodiments described above, Fig. 6 illustrates the chrominance signal conversion method process flow diagram that is suitable for many primary colors liquid crystal display for one embodiment of the invention.Please refer to Fig. 6, the chrominance signal conversion method that is suitable for many primary colors liquid crystal display of present embodiment may further comprise the steps.
Convert RGB (RGB) color input signal to YUV (brightness-chroma) chrominance signal (step S601).
According to the minimum chrominance signal in the rgb color input signal and brightness (Y) signal in the YUV chrominance signal and the chroma in the YUV chrominance signal (UV) signal is compensated (step S603).
Clearer, as shown in Figure 7, the step that the chroma in the YUV chrominance signal (UV) signal is compensated can comprise:
Take out the minimum chrominance signal (step S603-1) in the rgb color input signal;
Minimum chrominance signal in the rgb color input signal and brightness (Y) signal in the YUV chrominance signal are carried out division arithmetic, in order to export a compensation ratio (step S603-3);
Compensation ratio and an adjustable V colour difference signal are carried out additive operation, in order to export the first accumulated value (step S603-5);
Compensation ratio and an adjustable U colour difference signal are carried out additive operation, in order to export the second accumulated value (step S603-7);
Original V colour difference signal in chroma (UV) signal of the first accumulated value and YUV chrominance signal is carried out multiplying, in order to export a compensation V colour difference signal (step S603-9); And
Original U colour difference signal in chroma (UV) signal of the second accumulated value and YUV chrominance signal is carried out multiplying, in order to export a compensation U colour difference signal (step S603-11).
After chroma in the YUV chrominance signal (UV) signal compensated, then cushion brightness (Y) signal in the YUV chrominance signal, in order to export a compensate for brightness signal (step S605), then output compensates YUV chrominance signal (step S607) later again.Wherein, compensation YUV chrominance signal is later formed/is formed with compensation U colour difference signal by compensate for brightness signal, compensation V colour difference signal.
Behind output compensation YUV chrominance signal later, then provide W (in vain) color output signal (step S609) according to the minimum chrominance signal in the rgb color input signal, for example: the minimum chrominance signal in the buffering rgb color input signal.
After W (in vain) color output signal is provided, then will compensate YUV chrominance signal later and convert rgb color output signal (step S611) to, and according to a plurality of parameters that are associated with the rgb color output signal and W color output signal, and determine whether W color output signal and rgb color output signal to be revised, and (red, green, blue and white) color output signal (step S613) of exporting RGBW according to this.
In present embodiment, as shown in Figure 8, the step of output RGBW color output signal can comprise:
Be associated with a plurality of parameters (step S613-1) of rgb color output signal with acquisition according to the rgb color output signal;
Determine whether W color output signal and rgb color output signal are revised according to W color output signal and a plurality of parameters that are associated with the rgb color output signal, and a modification model (step S613-3) is provided according to this; And
According to the modification model that provides W color output signal and rgb color output signal are carried out calculation process, in order to export RGBW color output signal (step S613-5).
On the other hand, as shown in Figure 9, the step that acquisition is associated with a plurality of parameters of rgb color output signal can comprise:
Take out maximum colours signal in the rgb color output signal with as the first parameter (step S613-1-1);
Take out minimum chrominance signal in the rgb color output signal with as the second parameter (step S613-1-3);
Maximum colours signal in one preset maximum value and the rgb color output signal is carried out subtraction, in order to export a difference with as the 3rd parameter (step S613-1-5);
The difference of exporting is taken absolute value with as the 4th parameter (step S613-1-7); And
Minimum chrominance signal in the rgb color output signal is taken absolute value with as the 5th parameter (step S613-1-9).
The step of the modification model that in addition, provides in step S613-3 can comprise: according to judging that with one of preset maximum value, predetermined minimum, W color output signal and the first to the 5th parameter correlation connection flow process determines and provide modification model.Certainly, can be similar to Fig. 5 in this described judgement flow process, so also no longer given unnecessary details it at this.
In sum, the present invention according to the minimum chrominance signal in the rgb color input signal with via brightness (Y) signal in the YUV chrominance signal after the color gamut conversion the chroma of many primary colors liquid crystal display being adjusted/is compensated (chroma that this measure can promote many primary colors liquid crystal display), and moderately rgb color output signal and W color output signal are revised to promote the excitation of the shown picture of many primary colors liquid crystal display.
Although the present invention discloses as above with embodiment; so it is not to limit the present invention; have in the technical field under any and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.In addition, arbitrary embodiment of the present invention or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness of auxiliary patent document search, are not to limit interest field of the present invention.
Claims (20)
1. a chrominance signal conversion equipment is suitable for the liquid crystal display of primary colors more than, it is characterized in that, this chrominance signal conversion equipment comprises:
One first gamut conversion unit in order to receiving a rgb color input signal, and converts this rgb color input signal to a YUV chrominance signal;
One chroma compensating unit, couple this first gamut conversion unit, in order to according to the minimum chrominance signal in this rgb color input signal and the luminance signal in this YUV chrominance signal and the chroma signals in this YUV chrominance signal is compensated, compensate YUV chrominance signal later in order to export one, and provide a W color output signal according to this minimum chrominance signal; And
One second gamut conversion unit couples this chroma compensating unit, and in order to receiving this compensation YUV chrominance signal later, and the YUV chrominance signal after will compensating converts a rgb color output signal to.
2. chrominance signal conversion equipment as claimed in claim 1 is characterized in that, this chroma compensating unit comprises:
One gets the minimum value unit, in order to receiving this rgb color input signal, and takes out this minimum chrominance signal in this rgb color input signal;
One divider couples this first gamut conversion unit and this gets the minimum value unit, in order to this minimum chrominance signal and this luminance signal are carried out a division arithmetic, in order to export a compensation ratio;
One first adder couples this divider, in order to this compensation ratio and an adjustable V colour difference signal are carried out an additive operation, in order to export one first accumulated value;
One second adder couples this divider, in order to this compensation ratio and an adjustable U colour difference signal are carried out this additive operation, in order to export one second accumulated value;
One first multiplier couples this first gamut conversion unit and this first adder, in order to the original V colour difference signal in this first accumulated value and this chroma signals is carried out a multiplying, in order to export a compensation V colour difference signal;
One second multiplier couples this first gamut conversion unit and this second adder, in order to the original U colour difference signal in this second accumulated value and this chroma signals is carried out this multiplying, in order to export a compensation U colour difference signal;
One first impact damper, couple this first gamut conversion unit, in order to receive and to cushion this luminance signal, in order to export a compensate for brightness signal, wherein this compensate for brightness signal, this compensation V colour difference signal and this compensation U colour difference signal form this compensation YUV chrominance signal later; And
One second impact damper couples this and gets the minimum value unit, in order to receive and to cushion this minimum chrominance signal, in order to this W color output signal to be provided.
3. chrominance signal conversion equipment as claimed in claim 1 is characterized in that, also comprises:
One output amending unit, couple this chroma compensating unit and this second gamut conversion unit, be associated with a plurality of parameters and this W color output signal of this rgb color output signal in order to basis, and determine whether this W color output signal and this rgb color output signal are revised, and export according to this a RGBW color output signal.
4. chrominance signal conversion equipment as claimed in claim 3 is characterized in that, this output amending unit comprises:
One parameter generator couples this second gamut conversion unit, in order to receiving this rgb color output signal, and obtains according to this those parameters;
Whether one steering logic unit couples this chroma compensating unit and this parameter generator, in order to determine this W color output signal and this rgb color output signal to be revised, and a modification model is provided according to this according to this W color output signal and those parameters; And
One revises arithmetic element, couple this chroma compensating unit, this second gamut conversion unit and this steering logic unit, in order to according to this modification model this W color output signal and this rgb color output signal are carried out a calculation process, in order to export this RGBW color output signal.
5. chrominance signal conversion equipment as claimed in claim 4 is characterized in that, this parameter generator comprises:
One gets the maximal value unit, couples this second gamut conversion unit, in order to receiving this rgb color output signal, and takes out a maximum colours signal in this rgb color output signal with as one first parameter;
One gets the minimum value unit, couples this second gamut conversion unit, in order to receiving this rgb color output signal, and takes out a minimum chrominance signal in this rgb color output signal with as one second parameter;
One subtracter couples this and gets the maximal value unit, in order to a preset maximum value and this maximum colours signal are carried out a subtraction, in order to export a difference with as one the 3rd parameter;
One first unit that takes absolute value couples this subtracter, in order to this difference is taken absolute value with as one the 4th parameter; And
One second unit that takes absolute value couples this and gets the minimum value unit, in order to this minimum chrominance signal is taken absolute value with as one the 5th parameter.
6. chrominance signal conversion equipment as claimed in claim 5, it is characterized in that, this steering logic unit is also according to judging that with one of this preset maximum value, a predetermined minimum, this W color output signal and this first to the 5th parameter correlation connection flow process determines whether this W color output signal and this rgb color output signal to be revised, and this modification model is provided according to this.
7. a chrominance signal conversion method is suitable for the liquid crystal display of primary colors more than, it is characterized in that, this chrominance signal conversion method comprises:
Convert a rgb color input signal to a YUV chrominance signal;
According to the minimum chrominance signal in this rgb color input signal and the luminance signal in this YUV chrominance signal and the chroma signals in this YUV chrominance signal is compensated, compensate YUV chrominance signal later in order to export one, and provide a W color output signal according to this minimum chrominance signal; And
Convert this compensation YUV chrominance signal later to a rgb color output signal.
8. chrominance signal conversion method as claimed in claim 7 is characterized in that, the step that this chroma signals is compensated comprises:
Take out this minimum chrominance signal in this rgb color input signal;
This minimum chrominance signal and this luminance signal are carried out a division arithmetic, in order to export a compensation ratio;
This compensation ratio and an adjustable V colour difference signal are carried out an additive operation, in order to export one first accumulated value;
This compensation ratio and an adjustable U colour difference signal are carried out this additive operation, in order to export one second accumulated value;
Original V colour difference signal in this first accumulated value and this chroma signals is carried out a multiplying, in order to export a compensation V colour difference signal; And
Original U colour difference signal in this second accumulated value and this chroma signals is carried out this multiplying, in order to export a compensation U colour difference signal.
9. chrominance signal conversion method as claimed in claim 7 is characterized in that, before this compensation of output YUV chrominance signal later, also comprises:
Cushion this luminance signal, in order to exporting a compensate for brightness signal,
Wherein, this compensate for brightness signal, this compensation V colour difference signal and this compensation U colour difference signal form this compensation YUV chrominance signal later.
10. chrominance signal conversion method as claimed in claim 7 is characterized in that, provides the step of this W color output signal to comprise:
Cushion this minimum chrominance signal, in order to this W color output signal to be provided.
11. chrominance signal conversion method as claimed in claim 7 is characterized in that, also comprises:
According to a plurality of parameters that are associated with this rgb color output signal and this W color output signal, and determine whether this W color output signal and this rgb color output signal are revised, and export according to this a RGBW color output signal.
12. chrominance signal conversion method as claimed in claim 11 is characterized in that, the step of exporting this RGBW color output signal comprises:
According to this rgb color output signal to obtain those parameters;
Determine whether this W color output signal and this rgb color output signal to be revised, and a modification model is provided according to this according to this W color output signal and those parameters; And
According to this modification model this W color output signal and this rgb color output signal are carried out a calculation process, in order to export this RGBW color output signal.
13. chrominance signal conversion method as claimed in claim 12 is characterized in that, the step that obtains those parameters comprises:
Take out a maximum colours signal in this rgb color output signal with as one first parameter;
Take out a minimum chrominance signal in this rgb color output signal with as one second parameter;
One preset maximum value and this maximum colours signal are carried out a subtraction, in order to export a difference with as one the 3rd parameter;
This difference is taken absolute value with as one the 4th parameter; And
This minimum chrominance signal is taken absolute value with as one the 5th parameter.
14. chrominance signal conversion equipment as claimed in claim 13 is characterized in that, provides the step of this modification model to comprise:
According to judging that with one of this preset maximum value, a predetermined minimum, this W color output signal and this first to the 5th parameter correlation connection flow process determines and provide this modification model.
15. the primary colors liquid crystal display is characterized in that more than one kind, comprising:
One display panels has at least one by red, green, a blue picture element that forms with a Bai Sizi picture element;
One chrominance signal conversion equipment comprises:
One first gamut conversion unit in order to receiving a rgb color input signal, and converts this rgb color input signal to a YUV chrominance signal;
One chroma compensating unit, couple this first gamut conversion unit, in order to according to the minimum chrominance signal in this rgb color input signal and the luminance signal in this YUV chrominance signal and the chroma signals in this YUV chrominance signal is compensated, compensate YUV chrominance signal later in order to export one, and provide a W color output signal according to this minimum chrominance signal; And
One second gamut conversion unit couples this chroma compensating unit, and in order to receiving this compensation YUV chrominance signal later, and the YUV chrominance signal after will compensating converts a rgb color output signal to;
One drive unit couples this display panels and this chrominance signal conversion equipment, in order to this of this picture element is red, this is green to drive according to this W color output signal and this rgb color output signal, this indigo plant and this Bai Sizi picture element; And
One backlight module is in order to provide this display panels a required backlight.
16. many primary colors liquid crystal display as claimed in claim 15 is characterized in that, this chroma compensating unit comprises:
One gets the minimum value unit, in order to receiving this rgb color input signal, and takes out this minimum chrominance signal in this rgb color input signal;
One divider couples this first gamut conversion unit and this gets the minimum value unit, in order to this minimum chrominance signal and this luminance signal are carried out a division arithmetic, in order to export a compensation ratio;
One first adder couples this divider, in order to this compensation ratio and an adjustable V colour difference signal are carried out an additive operation, in order to export one first accumulated value;
One second adder couples this divider, in order to this compensation ratio and an adjustable U colour difference signal are carried out this additive operation, in order to export one second accumulated value;
One first multiplier couples this first gamut conversion unit and this first adder, in order to the original V colour difference signal in this first accumulated value and this chroma signals is carried out a multiplying, in order to export a compensation V colour difference signal;
One second multiplier couples this first gamut conversion unit and this second adder, in order to the original U colour difference signal in this second accumulated value and this chroma signals is carried out this multiplying, in order to export a compensation U colour difference signal;
One first impact damper, couple this first gamut conversion unit, in order to receive and to cushion this luminance signal, in order to export a compensate for brightness signal, wherein this compensate for brightness signal, this compensation V colour difference signal and this compensation U colour difference signal form this compensation YUV chrominance signal later; And
One second impact damper couples this and gets the minimum value unit, in order to receive and to cushion this minimum chrominance signal, in order to this W color output signal to be provided.
17. many primary colors liquid crystal display as claimed in claim 15 is characterized in that, this chrominance signal conversion equipment also comprises:
One output amending unit, couple this chroma compensating unit and this second gamut conversion unit, be associated with a plurality of parameters and this W color output signal of this rgb color output signal in order to basis, and determine whether this W color output signal and this rgb color output signal are revised, and export according to this a RGBW color output signal
Wherein, this drive unit is also in order to this of this picture element is red, this is green to drive according to this RGBW color output signal, this indigo plant and this Bai Sizi picture element.
18. many primary colors liquid crystal display as claimed in claim 17 is characterized in that, this output amending unit comprises:
One parameter generator couples this second gamut conversion unit, in order to receiving this rgb color output signal, and obtains according to this those parameters;
Whether one steering logic unit couples this chroma compensating unit and this parameter generator, in order to determine this W color output signal and this rgb color output signal to be revised, and a modification model is provided according to this according to this W color output signal and those parameters; And
One revises arithmetic element, couple this chroma compensating unit, this second gamut conversion unit and this steering logic unit, in order to according to this modification model this W color output signal and this rgb color output signal are carried out a calculation process, in order to export this RGBW color output signal.
19. many primary colors liquid crystal display as claimed in claim 18 is characterized in that, this parameter generator comprises:
One gets the maximal value unit, couples this second gamut conversion unit, in order to receiving this rgb color output signal, and takes out a maximum colours signal in this rgb color output signal with as one first parameter;
One gets the minimum value unit, couples this second gamut conversion unit, in order to receiving this rgb color output signal, and takes out a minimum chrominance signal in this rgb color output signal with as one second parameter;
One subtracter couples this and gets the maximal value unit, in order to a preset maximum value and this maximum colours signal are carried out a subtraction, in order to export a difference with as one the 3rd parameter;
One first unit that takes absolute value couples this subtracter, in order to this difference is taken absolute value with as one the 4th parameter; And
One second unit that takes absolute value couples this and gets the minimum value unit, in order to this minimum chrominance signal is taken absolute value with as one the 5th parameter.
20. many primary colors liquid crystal display as claimed in claim 19, it is characterized in that, this steering logic unit is also according to judging that with one of this preset maximum value, a predetermined minimum, this W color output signal and this first to the 5th parameter correlation connection flow process determines whether this W color output signal and this rgb color output signal to be revised, and this modification model is provided according to this.
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