CN103000145B - 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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- CN103000145B CN103000145B CN201110276272.0A CN201110276272A CN103000145B CN 103000145 B CN103000145 B CN 103000145B CN 201110276272 A CN201110276272 A CN 201110276272A CN 103000145 B CN103000145 B CN 103000145B
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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 relate to especially 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 in the time of pixel design, increase the aperture opening ratio (aperture ratio, AR) of picture element.But, 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 the variation on circuit parasitic effect and 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 being formed by RGB (RGB) three sub-picture elements in tradition.Thus, can promote mean flow rate and the contrast of liquid crystal display entirety.But traditional many primary colors liquid crystal display still maintains and receives RGB (RGB) color input signal, and take out minimum chrominance signal (min{R, G, B}) in rgb color input signal to drive the sub-picture element of W in picture element.
That is the R color input signal in rgb color input signal is in order to drive the sub-picture element of R in picture element; G color input signal in rgb color input signal is in order to drive the sub-picture element of G in picture element; B color input signal in rgb color input signal is in order to drive the sub-picture element of B in picture element; And minimum chrominance signal (min{R, G, B}) in rgb color input signal is in order to drive the sub-picture element of W in picture element.
Thus, the type of drive of traditional many primary colors liquid crystal display not only can make the chroma of many primary colors liquid crystal display decline, but also can cause the excitation decline (that is picture is partially white) of the shown picture of many primary colors liquid crystal display.
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 receive RGB (RGB) color input signal, and converts rgb color input signal to YUV (brightness-chroma) chrominance signal.Chroma compensating unit couples the first gamut conversion unit, in order to the chroma in YUV chrominance signal (UV) signal is compensated according to brightness (Y) signal in minimum chrominance signal and YUV chrominance signal in rgb color input signal, in order to output compensation YUV chrominance signal later, and provide W (in vain) color output signal according to the minimum chrominance signal in rgb color input signal.The second gamut conversion unit couples chroma compensating unit, in order to receive compensation YUV chrominance signal later, and converts compensation YUV chrominance signal later to rgb color output signal.
In one embodiment of the invention, the chrominance signal conversion equipment of carrying also comprises: output amending unit, it couples chroma compensating unit and the second gamut conversion unit, be associated with multiple 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 are 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 brightness (Y) signal in minimum chrominance signal and YUV chrominance signal in rgb color input signal, the chroma in YUV chrominance signal (UV) signal is compensated, in order to output compensation YUV chrominance signal later, and provide W (in vain) color output signal according to the minimum chrominance signal in rgb color input signal; And convert compensation YUV chrominance signal later to rgb color output signal.
In one embodiment of the invention, the chrominance signal conversion method of carrying also comprises: according to the multiple parameters and the W color output signal that are associated with rgb color output signal, and determine whether W color output signal and rgb color output signal are revised, and (red, green, blue and white) color output signal of exporting RGBW according to this.
An embodiment more of the present invention provides a kind of many primary colors liquid crystal display, and it comprises: display panels, aforementioned carried chrominance signal conversion equipment, drive unit, and backlight module.Display panels has at least one picture element being made up of red, green, blue and Bai Sizi picture element.Drive unit couples display panels and chrominance signal conversion equipment, come from W color output signal and the rgb color output signal of chrominance signal conversion equipment in order to basis, or RGBW color output signal, 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 rgb color input signal with via brightness (Y) signal in the YUV chrominance signal after color gamut conversion the chroma of many primary colors liquid crystal display is adjusted/to be 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 are only exemplary and illustrative, and it can not limit the scope that institute of the present invention wish is advocated.
Brief description of the drawings
Below appended graphic is a part for instructions of the present invention, illustrated example embodiment of the present invention, principle of the present invention is described together with the description of appended graphic and instructions.
Fig. 1 illustrates the schematic diagram of the many primary colors liquid crystal display (multi-primary color LCD) 10 into one embodiment of the invention.
Fig. 2 illustrates the schematic diagram into the chrominance signal conversion equipment 103 of one embodiment of the invention.
Fig. 3 illustrates the schematic diagram into the output amending unit 207 of one embodiment of the invention.
Fig. 4 illustrates the schematic diagram into the parameter generator 301 of one embodiment of the invention.
Fig. 5 illustrates the schematic diagram into the judgement flow process being associated with preset maximum value (, 255), predetermined minimum (, 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 schematic diagram that the chroma in YUV chrominance signal (UV) signal is compensated for one embodiment of the invention.
Fig. 8 illustrates the schematic diagram into the output RGBW color output signal of one embodiment of the invention.
Fig. 9 illustrates the schematic diagram that is associated with multiple 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: chrominance signal conversion equipment;
105: drive unit;
107: backlight module;
201: the first gamut conversion unit;
203: chroma compensating unit;
205: the second gamut conversion unit;
207: output amending unit;
209: get minimum value unit;
211: divider;
213: first adder;
215: second adder;
217: the first multipliers;
219: the second multipliers;
301: parameter generator;
303: steering logic unit;
305: revise arithmetic element;
401: get maximal value unit;
403: get minimum value unit;
405: subtracter;
Unit takes absolute value at 407: the first;
Unit takes absolute value at 409: the second;
BUF1: the first impact damper;
BUF2: the second impact damper;
Pix: picture element;
P
r: red pieces picture element;
P
g: green sub-picture element;
P
b: blue sub-picture element;
P
w: 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 in Bi}:RGB color input signal Ri, Gi, Bi
Max, Min, V1～V3: parameter;
C1～C7: Rule of judgment;
M0～M3: modification model;
S601～S613: the 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 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: the each step that obtains the multiple parameters that are associated with rgb color output signal.
Embodiment
With detailed reference to example embodiment of the present invention, the example of described example embodiment is described in the accompanying drawings.In addition, all possibility parts are used the assembly/member of same numeral to represent identical or similar portions in graphic and embodiment.
Fig. 1 illustrates the schematic 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.
Display panels 101 has multiple picture element (pixel) Pix that arrange with matrix-style, and each picture element Pix is by red, green, blue and Bai Sizi picture element (sub-pixel) P
r, P
g, P
b, P
winstitute forms; Backlight module 107 can be the backlight module of any pattern/type now, in order to provide display panels 101 required backlight.
Chrominance signal conversion equipment 103 is in order to receive 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
w.In the 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, the content that review prior art discloses is known, and traditional many primary colors liquid crystal display still maintains and receives rgb color input signal, and takes out the minimum chrominance signal (min{R in rgb color input signal, G, B}) to drive the sub-picture element of W (in vain) in picture element.Thus, the type of drive of traditional many primary colors liquid crystal display not only can make the chroma of many primary colors liquid crystal display decline, but also can cause the excitation decline (that is picture is partially white) of the shown picture of many primary colors liquid crystal display.
In view of this, the present embodiment can solve the problem that prior art is addressed by chrominance signal conversion equipment 103.Clearer, Fig. 2 illustrates the schematic 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) 203, the second gamut conversion unit 205, and output amending unit (output calibration unit) 207.Wherein, the first gamut conversion unit (RGB → YUV) 201 is in order to receive 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.
Chroma compensating unit 203 couples the first gamut conversion unit 201, in order to according to the luminance signal (Y) in the minimum chrominance signal in rgb color input signal Ri, Gi, Bi and YUV chrominance signal Y, U, V and the chroma signals (UV) in YUV chrominance signal Y, U, V is compensated, in order to output compensation YUV chrominance signal Y ', U ', V ' later, and provide W (in vain) color output signal Wo ' according to the minimum chrominance signal in rgb color input signal Ri, Gi, Bi.
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 receive rgb color input signal Ri, Gi, Bi, and take out the minimum chrominance signal in rgb color input signal Ri, Gi, Bi, that is min{Ri, Gi, Bi}.
Divider 211 couples the first gamut conversion unit 201 and gets minimum value unit 209, in order to the minimum chrominance signal (min{Ri in rgb color input signal Ri, Gi, Bi, Gi, Bi}) with YUV chrominance signal Y, U, V in luminance signal (Y) carry out division arithmetic, in order to output compensation ratio C OMP, that is: min{Ri, Gi, Bi}/Y.
First adder 213 couples divider 211, carries out additive operation in order to compensation ratio C OMP and an adjustable V colour difference signal ADJ_V that divider 211 is exported, in order to export the first accumulated value, that is: COMP+ADJ_V.Second adder 215 couples divider 211, carries out additive operation in order to compensation ratio C OMP and an adjustable U colour difference signal ADJ_U that divider 211 is exported, in order to export the second accumulated value, that is: COMP+ADJ_U.
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, in order to export a compensation V colour difference signal V ', 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, in order to export a compensation U colour difference signal, 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) in YUV chrominance signal Y, U, V, in order to export a compensate for brightness signal Y '.In the 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 to cushion minimum chrominance signal in rgb color input signal Ri, Gi, Bi (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 couples chroma compensating unit 203, in order to receive compensation YUV chrominance signal Y ', U ', V ' later, and convert compensation YUV chrominance signal Y ', U ', V ' later to rgb color output signal Ro ', Go ', Bo '.Base this, output amending unit 207 couples chroma compensating unit 203 and the second gamut conversion unit 205, be associated with multiple 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 schematic 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 receive rgb color output signal Ro ', Go ', Bo ', and obtains and is associated with rgb color output signal Ro ', multiple parameter Max, the Min of Go ', Bo ', V1, V2, V3 according to this.
In the present embodiment, as shown in Figure 4, it illustrates the schematic 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 receive rgb color output signal Ro ', Go ', Bo ', and take out maximum colours signal in rgb color output signal Ro ', Go ', Bo ' (that is, max{Ro ', Go ', Bo ' }) using as parameter Max.
Get minimum value unit 403 and couple the second gamut conversion unit 205, in order to receive rgb color output signal Ro ', Go ', Bo ', and take out minimum chrominance signal in rgb color output signal Ro ', Go ', Bo ' (that is, min{Ro ', Go ', Bo ' }) using as parameter Min.Subtracter 405 couples gets maximal value unit 401, for example, in order to a preset maximum value (: 255, taking picture element resolution as the situation of 8 is as example, but be not restricted to this) carry out subtraction with the maximum colours signal (max{Ro ', Go ', Bo ' }) in rgb color output signal Ro ', Go ', Bo ', in order to export a difference (that is, 255-max{Ro ', Go ', Bo ' }) using as V parameter 1.First unit 407 that takes absolute value couples subtracter 405, takes absolute value using 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, takes absolute value using as V parameter 2 in order to the minimum chrominance signal in rgb color output signal Ro ', Go ', Bo ' (min{Ro ', Go ', Bo ' }).
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, V3 that parameter generator 301 obtains.In the present embodiment, steering logic unit 303 can be also according to preset maximum value (, 255), predetermined minimum (for example: 0, taking picture element resolution as the situation of 8 is 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 modification model.
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 providing according to steering logic unit 303, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo.
Clearer, Fig. 5 illustrate into one embodiment of the invention with preset maximum value (, 255) schematic diagram of the judgement flow process that, predetermined minimum (, 0), W color output signal Wo ' and parameter Max, Min, V1, V2, V3 are associated.Please refer to Fig. 5, be greater than preset maximum value (, 255) if parameter Max is judged in steering logic unit 303, and parameter Min is less than predetermined minimum (, 0); Or, judge parameter Max and be less than or equal to preset maximum value (, 255), and (parameter Min is more than or equal to predetermined minimum, 0) (that is meeting Rule of judgment C1), 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 according to modification model M0, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro ' ± 0; Go=Go ' ± 0; Bo=Bo ' ± 0 and Wo=Wo ' ± 0.
Do not meeting under the condition of Rule of judgment C1, if judging parameter Min, steering logic unit 303 is greater than predetermined minimum (, 0) not (that is not meeting Rule of judgment C2), and W color output signal Wo ' is greater than V parameter 3 (that is meeting Rule of judgment C3), 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 according to the modification model M1 of the first compensation, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+V1; Go=Go '+V1; Bo=Bo '+V1 and Wo=Wo '-V1.
Do not meeting under the condition of Rule of judgment C1, if judging parameter Min, steering logic unit 303 is greater than predetermined minimum (, 0) not (that is not meeting Rule of judgment C2), and W color output signal Wo ' is less than V parameter 3 (that is not meeting Rule of judgment C3), 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 according to the modification model M2 of the second compensation, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '-Min; Go=Go '-Min; Bo=Bo '-Min and Wo=Wo '+Min.
Do not meeting under the condition of Rule of judgment C1, if judging parameter Min, steering logic unit 303 is less than predetermined minimum (, 0) (that is meeting Rule of judgment C2), V parameter 2 are greater than V parameter 1 (that is not meeting Rule of judgment C4), W color output signal Wo ' is less than V parameter 2 (that is not meeting Rule of judgment C5), and W color output signal Wo ' is less than V parameter 1 (that is meeting Rule of judgment C6), 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 according to the modification model M3 of the 3rd compensation, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+Wo '; Go=Go '+Wo '; Bo=Bo '+Wo ' and Wo=Wo '-Wo '.
Do not meeting under the condition of Rule of judgment C1, if judging parameter Min, steering logic unit 303 is less than predetermined minimum (, 0) (that is meeting Rule of judgment C2), V parameter 2 are greater than V parameter 1 (that is not meeting Rule of judgment C4), W color output signal Wo ' is less than V parameter 2 (that is not meeting Rule of judgment C5), and W color output signal Wo ' is greater than V parameter 1 (that is not meeting Rule of judgment C6), 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 according to the modification model M1 of the first compensation, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+V1; Go=Go '+V1; Bo=Bo '+V1 and Wo=Wo '-V1.
Do not meeting under the condition of Rule of judgment C1, if judging parameter Min, steering logic unit 303 is less than predetermined minimum (, 0) (that is meeting Rule of judgment C2), V parameter 2 are greater than V parameter 1 (that is not meeting Rule of judgment C4), and W color output signal Wo ' is greater than V parameter 2 (that is meeting Rule of judgment C5), 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 according to the modification model M1 of the first compensation, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+V1; Go=Go '+V1; Bo=Bo '+V1 and Wo=Wo '-V1.
Do not meeting under the condition of Rule of judgment C1, if judging parameter Min, steering logic unit 303 is less than predetermined minimum (, 0) (that is meeting Rule of judgment C2), V parameter 2 are less than V parameter 1 (that is meeting Rule of judgment C4), and W color output signal Wo ' is less than V parameter 2 (that is not meeting Rule of judgment C7), 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 according to the modification model M3 of the 3rd compensation, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '+Wo '; Go=Go '+Wo '; Bo=Bo '+Wo ' and Wo=Wo '-Wo '.
Do not meeting under the condition of Rule of judgment C1, if judging parameter Min, steering logic unit 303 is less than predetermined minimum (, 0) (that is meeting Rule of judgment C2), V parameter 2 are less than V parameter 1 (that is meeting Rule of judgment C4), and W color output signal Wo ' is greater than V parameter 2 (that is meeting Rule of judgment C7), 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 according to the modification model M2 of the second compensation, W color output signal Wo ' and rgb color output signal Ro ', Go ', Bo ' are carried out to calculation process, in order to export RGBW color output signal Ro, Go, Bo, Wo, that is: Ro=Ro '-Min; Go=Go '-Min; Bo=Bo '-Min and Wo=Wo '+Min.
Judgement flow process based on shown in Fig. 5 can clearly be learnt, because chroma compensating unit 203 is mainly in order to the chroma signals (UV) (this measure can promote the chroma of many primary colors liquid crystal display 10) in compensation/adjustment YUV chrominance signal Y, U, V, so after the conversion via the second gamut conversion unit (YUV → RGB) 205, rgb color output signal Ro ', Go ', Bo ' likely can exceed its expressible upper limit (that is being greater than preset maximum value 255) or lower limit (that is being less than predetermined minimum 0) again.Base this, if will in rgb color output signal Ro ', Go ', Bo ', exceed its expressible part directly delete, will cause the proportion of rgb color output signal Ro ', Go ', Bo ' produce deviation and cause cross-color.
In view of this, the present embodiment sees through especially output amending unit 207 and carrys out to exceed in modified R GB color output signal Ro ', Go ', Bo ' its expressible part (that is be greater than preset maximum value 255 and/or be less than the part of predetermined minimum 0) to adjust mechanism/mode of W color output signal Wo '.Thus, moderately rgb color output signal Ro ', Go ', Bo ' are revised with W color output signal Wo ' 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 after the conversion via the second gamut conversion unit (YUV → RGB) 205, rgb color output signal Ro ', Go ', Bo ' can't exceed its expressible upper limit (that is being greater than preset maximum value 255) or lower limit (that is being less than predetermined minimum 0), 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 '.
Based on the content of disclose/teaching of 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 the present embodiment comprises the following steps.
Convert RGB (RGB) color input signal to YUV (brightness-chroma) chrominance signal (step S601).
According to brightness (Y) signal in minimum chrominance signal and YUV chrominance signal in rgb color input signal, the chroma in YUV chrominance signal (UV) signal is compensated to (step S603).
Clearer, as shown in Figure 7, the step that the chroma in YUV chrominance signal (UV) signal is compensated can comprise:
Take out the minimum chrominance signal (step S603-1) in rgb color input signal;
Brightness (Y) signal in minimum chrominance signal and YUV chrominance signal in rgb color input signal is carried out to division arithmetic, in order to export a compensation ratio (step S603-3);
Compensation ratio and an adjustable V colour difference signal are carried out to 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 to 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 to 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 to multiplying, in order to export a compensation U colour difference signal (step S603-11).
After chroma in YUV chrominance signal (UV) signal is compensated, cushion brightness (Y) signal in 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.
After output compensation YUV chrominance signal later, provide W (in vain) color output signal (step S609) according to the minimum chrominance signal in rgb color input signal, for example: the minimum chrominance signal in buffering rgb color input signal.
After W (in vain) color output signal is provided, convert compensation YUV chrominance signal later to rgb color output signal (step S611), and according to the multiple parameters and the W color output signal that are associated with rgb color output signal, and determine whether W color output signal and rgb color output signal are revised, and (red, green, blue and white) color output signal (step S613) of exporting RGBW according to this.
In the present embodiment, as shown in Figure 8, the step of output RGBW color output signal can comprise:
Be associated with multiple parameters (step S613-1) of rgb color output signal with acquisition according to rgb color output signal;
Determine whether W color output signal and rgb color output signal are revised according to W color output signal and the multiple parameters that are associated with rgb color output signal, and a modification model (step S613-3) is provided according to this; And
According to provided modification model, W color output signal and rgb color output signal are carried out to 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 obtains the multiple parameters that are associated with rgb color output signal can comprise:
Take out maximum colours signal in rgb color output signal using as the first parameter (step S613-1-1);
Take out minimum chrominance signal in rgb color output signal using as the second parameter (step S613-1-3);
Maximum colours signal in one preset maximum value and rgb color output signal is carried out to subtraction, in order to export a difference using as the 3rd parameter (step S613-1-5);
Exported difference is taken absolute value using as the 4th parameter (step S613-1-7); And
Minimum chrominance signal in rgb color output signal is taken absolute value using as the 5th parameter (step S613-1-9).
The step of the modification model in addition, providing 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 the judgement flow process described in this, so also no longer repeated it at this.
In sum, the present invention according to the minimum chrominance signal in rgb color input signal with via brightness (Y) signal in the YUV chrominance signal after color gamut conversion the chroma of many primary colors liquid crystal display is adjusted/to be 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 in order to limit the present invention; under any, in technical field, have and conventionally know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.In addition, arbitrary embodiment of the present invention or claim must not reached the disclosed whole objects of the present invention or advantage or feature.In addition, summary part and title are only for the use of auxiliary patent document search, are not used for limiting interest field of the present invention.
Claims (17)
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 receive 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 the chroma signals in this YUV chrominance signal is compensated according to the luminance signal in a minimum chrominance signal and this YUV chrominance signal in this rgb color input signal, in order to export compensation YUV chrominance signal later, and provide a W color output signal according to this minimum chrominance signal; And
One second gamut conversion unit, couples this chroma compensating unit, in order to receive this compensation YUV chrominance signal later, and converts this compensation YUV chrominance signal later to a rgb color output signal; Wherein: this chroma compensating unit comprises:
One gets minimum value unit, in order to receive 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 minimum value unit, in order to this minimum chrominance signal and this luminance signal are carried out to 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 to 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 to 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 to 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 to 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 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.
2. 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 multiple 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 RGBW color output signal.
3. chrominance signal conversion equipment as claimed in claim 2, is characterized in that, this output amending unit comprises:
One parameter generator, couples this second gamut conversion unit, in order to receive 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 to a calculation process, in order to export this RGBW color output signal.
4. chrominance signal conversion equipment as claimed in claim 3, is characterized in that, this parameter generator comprises:
One gets maximal value unit, couples this second gamut conversion unit, in order to receive this rgb color output signal, and takes out a maximum colours signal in this rgb color output signal using as one first parameter;
One gets minimum value unit, couples this second gamut conversion unit, in order to receive this rgb color output signal, and takes out a minimum chrominance signal in this rgb color output signal using as one second parameter;
One subtracter, couples this and gets maximal value unit, in order to a preset maximum value and this maximum colours signal are carried out to a subtraction, in order to export a difference using as one the 3rd parameter;
One first unit that takes absolute value, couples this subtracter, in order to this difference is taken absolute value using as one the 4th parameter; And
One second unit that takes absolute value, couples this and gets minimum value unit, in order to this minimum chrominance signal is taken absolute value using as one the 5th parameter.
5. chrominance signal conversion equipment as claimed in claim 4, 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.
6. 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 luminance signal in a minimum chrominance signal and this YUV chrominance signal in this rgb color input signal, the chroma signals in this YUV chrominance signal is compensated, in order to export compensation YUV chrominance signal later, 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; Wherein:
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 to a division arithmetic, in order to export a compensation ratio;
This compensation ratio and an adjustable V colour difference signal are carried out to an additive operation, in order to export one first accumulated value;
This compensation ratio and an adjustable U colour difference signal are carried out to this additive operation, in order to export one second accumulated value;
An original V colour difference signal in this first accumulated value and this chroma signals is carried out to a multiplying, in order to export a compensation V colour difference signal; And
An original U colour difference signal in this second accumulated value and this chroma signals is carried out to this multiplying, in order to export a compensation U colour difference signal.
7. chrominance signal conversion method as claimed in claim 6, is characterized in that, before this compensation of output YUV chrominance signal later, also comprises:
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.
8. chrominance signal conversion method as claimed in claim 6, 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.
9. chrominance signal conversion method as claimed in claim 6, is characterized in that, also comprises:
According to the multiple parameters and this W color output signal that are associated with this rgb color output signal, and determine whether this W color output signal and this rgb color output signal are revised, and export according to this RGBW color output signal.
10. chrominance signal conversion method as claimed in claim 9, 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 to a calculation process, in order to export this RGBW color output signal.
11. chrominance signal conversion methods as claimed in claim 10, is characterized in that, the step that obtains those parameters comprises:
Take out a maximum colours signal in this rgb color output signal using as one first parameter;
Take out a minimum chrominance signal in this rgb color output signal using as one second parameter;
One preset maximum value and this maximum colours signal are carried out to a subtraction, in order to export a difference using as one the 3rd parameter;
This difference is taken absolute value using as one the 4th parameter; And
This minimum chrominance signal is taken absolute value using as one the 5th parameter.
12. chrominance signal conversion methods as claimed in claim 11, is characterized in that, provide 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.
More than 13. 1 kinds, primary colors liquid crystal display, is characterized in that, comprising:
One display panels, has at least one by red, green, a blue picture element forming with a Bai Sizi picture element;
One chrominance signal conversion equipment, comprising:
One first gamut conversion unit, in order to receive 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 the chroma signals in this YUV chrominance signal is compensated according to the luminance signal in a minimum chrominance signal and this YUV chrominance signal in this rgb color input signal, in order to export compensation YUV chrominance signal later, and provide a W color output signal according to this minimum chrominance signal; And
One second gamut conversion unit, couples this chroma compensating unit, in order to receive this compensation YUV chrominance signal later, and converts this compensation YUV chrominance signal later to a rgb color output signal;
One drive unit, couples this display panels and this chrominance signal conversion equipment, in order to according to this W color output signal and this rgb color output signal, to drive, this of this picture element is red, this is green, this indigo plant and this Bai Sizi picture element; And
One backlight module, in order to provide this display panels a required backlight; Wherein:
This chroma compensating unit comprises:
One gets minimum value unit, in order to receive 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 minimum value unit, in order to this minimum chrominance signal and this luminance signal are carried out to 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 to 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 to 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 to 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 to 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 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.
14. many primary colors liquid crystal display as claimed in claim 13, 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 multiple 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 RGBW color output signal
Wherein, this drive unit also in order to according to this RGBW color output signal, to drive, this of this picture element is red, this is green, this indigo plant and this Bai Sizi picture element.
15. many primary colors liquid crystal display as claimed in claim 14, is characterized in that, this output amending unit comprises:
One parameter generator, couples this second gamut conversion unit, in order to receive 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 to a calculation process, in order to export this RGBW color output signal.
16. many primary colors liquid crystal display as claimed in claim 15, is characterized in that, this parameter generator comprises:
One gets maximal value unit, couples this second gamut conversion unit, in order to receive this rgb color output signal, and takes out a maximum colours signal in this rgb color output signal using as one first parameter;
One gets minimum value unit, couples this second gamut conversion unit, in order to receive this rgb color output signal, and takes out a minimum chrominance signal in this rgb color output signal using as one second parameter;
One subtracter, couples this and gets maximal value unit, in order to a preset maximum value and this maximum colours signal are carried out to a subtraction, in order to export a difference using as one the 3rd parameter;
One first unit that takes absolute value, couples this subtracter, in order to this difference is taken absolute value using as one the 4th parameter; And
One second unit that takes absolute value, couples this and gets minimum value unit, in order to this minimum chrominance signal is taken absolute value using as one the 5th parameter.
17. many primary colors liquid crystal display as claimed in claim 16, 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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