CN100546393C - Signal processing method, image display and television equipment - Google Patents

Abstract

A kind of signal processing method, this signal processing method comprise the steps: to import three signals of a color of pixel of regulation; And four signals of three signals generations from being imported, each signal indication of wherein said four signals is used for showing by colour mixture the intensity of four kinds of different colours of a color of pixel, wherein said generation step comprises first switch process, three conversion of signals of input are become two signals of the intensity of two kinds of colors among four kinds of colors of expression, and the signal of intensity of expression blend color, wherein this blend color be by mix (a) these four kinds of colors or (b) a plurality of colors in these four kinds of colors obtain; And second switch process, with the conversion of signals of the intensity of the expression blend color a plurality of signals for the intensity of a plurality of colors of expression, wherein these a plurality of colors comprise other two kind colors different with these two kinds of colors at least.

Description

Signal processing method, image display and television equipment

Technical field

The present invention relates to a kind of signal processing method, image display and television equipment, this signal processing method produces four signals of the intensity of four kinds of different colours of expression, so that, represent a color of pixel by blend color according to three signals of having specified a color of pixel.

Background technology

Conventionally, the display such as television set or computer display monitor makes the three primary colors of using up come display image.In other words, can represent shades of colour as follows: pixel is made up of each sub-pixel of red (R), green (G) and blue (B), and use and the principle of putting colour mixture (parasynthetic mixed color) and addition colour mixture (additive mixedcolor) change the light intensity of R, G and B.The color that can reproduce by this display is in can scope vector representation and that represent by three primary colors R, G and B.

Fig. 9 shows color gamut with three-dimensional vector, and this color gamut can be reproduced by trichromatic display.In example shown in Figure 9,, use CIE 1931 color coordinatess system (X, Y and Z color coordinates system) as the coordinate space of the position that on three-dimensional, shows R, G and B.Then the coordinate when R gets peak be defined as (XR, YR, ZR), the coordinate when G gets peak be defined as (XG, YG, ZG), and the coordinate when B gets peak be defined as (XB, YB, ZB).In this case, display can be indicated the color of hexahedron inside shown in Figure 9.

In addition, only, also can represent the color reproduction scope by x and the y chromaticity coordinate (xy chromatic diagram) of using X, Y and Z color coordinates system from the viewpoint of colourity.In this case, the color reproduction scope is the zone by the triangle encompasses of Figure 10.

In trichromatic display, the coefficient of supposing three primary colors R, G and B is r, g and b (0 to 1 value is respectively in effective range), and coordinate is that (XD, YD, color D ZD) can be represented as " mathematic(al) representation 1 ".

＜mathematic(al) representation 1 〉

$\stackrel{\→}{D}=r\×\stackrel{\→}{R}+g\×\stackrel{\→}{G}+b\×\stackrel{\→}{B}$

Wherein D, R, G and B are respectively the vectors from initial point (0,0,0) to D, R, G and B.

Conversion " mathematic(al) representation 1 " is also represented it with matrix computations, then forms " mathematic(al) representation 2 ".

＜mathematic(al) representation 2 〉

$\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)={\mathrm{<figure-callout\; id="3"\; label="M"\; filenames="C20061015177400321.png,C20061015177400341.png"\; state="\{\{state\}\}">M</figure-callout>}}_3\&CenterDot;\left(\begin{array}{c}r\\ g\\ b\end{array}\right),$ ${\mathrm{<figure-callout\; id="3"\; label="M"\; filenames="C20061015177400321.png,C20061015177400341.png"\; state="\{\{state\}\}">M</figure-callout>}}_3=\left(\begin{array}{ccc}{X}_R& X_G& X_B\\ Y_R& Y_G& Y_B\\ Z_R& Z_G& Z_B\end{array}\right)$

Therefore, obtain to be used to represent coefficient r, g and the b of color D, shown in " mathematic(al) representation 3 ".

＜mathematic(al) representation 3 〉

$\left(\begin{array}{c}r\\ g\\ b\end{array}\right)=M_3^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

In recent years, attempted using four kinds or more primary colors for three primary display, so that widen the color reproduction scope.Therefore, can reproduce the color that to represent by conventional display, and can improve the color reproduction ability, and obtain the sense of reality of height.

In the display of n primary colors (n is equal to or greater than 3 integer), obtain to be used for X, Y and the Z coordinate (XD, YD and ZD) of display color of the value of each primary colors, shown in " mathematic(al) representation 4 ".

＜mathematic(al) representation 4 〉

$\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)=M_n\text{\&CenterDot;}\left(\begin{array}{c}c1\\ c2\\ \mathrm{<figure-callout\; id="3"\; label="c"\; filenames="C20061015177400321.png,C20061015177400341.png"\; state="\{\{state\}\}">c</figure-callout>}3\\ .\\ .\\ .\\ \mathrm{cn}\end{array}\right),$ $M_n=\left(\begin{array}{ccccc}{X}_{c1}& X_{c2}& {\mathrm{<figure-callout\; id="3"\; label="X\; c"\; filenames="C20061015177400321.png,C20061015177400341.png"\; state="\{\{state\}\}">X</figure-callout>}}_c& ...& X_{\mathrm{cn}}\\ Y_{c1}& Y_{c2}& Y_{\mathrm{<figure-callout\; id="3"\; label="c"\; filenames="C20061015177400321.png,C20061015177400341.png"\; state="\{\{state\}\}">c</figure-callout>}3}& ...& Y_{\mathrm{cn}}\\ Z_{c1}& Z_{c2}& {\mathrm{<figure-callout\; id="3"\; label="Z\; c"\; filenames="C20061015177400321.png,C20061015177400341.png"\; state="\{\{state\}\}">Z</figure-callout>}}_c& ...& Z_{\mathrm{cn}}\end{array}\right)$

Wherein c1, c2, c3 ... and cn is the coefficient of each primary colors, and (Xc1, Yc1, Zc1), (Xc2, Yc2, Zc2) ... (Xcn, Ycn Zcn) are X, Y and the Z coordinate of each corresponding primary colors.In order to obtain the coefficient of each primary colors from X to be shown, Y and Z value, inverse matrix that should compute matrix Mn is shown in " mathematic(al) representation 3 ".Yet matrix M n is the matrix of 3 * n, makes directly to obtain its inverse matrix.

Japanese Patent Application Laid-Open (JP-A.) No.6-261332 discloses by using six primary colors to show the method for the color of a scope, and the color of this scope can not be shown by the trichromatic existing-quality television machine of RGB.According to first example of JP-A.No.6-261332, the picture signal that is transmitted is converted into rgb signal, and then, it is converted into the XY chromaticity coordinate, so that acquisition XY chromaticity coordinate is positioned at the position on the xy chromatic diagram.When Show Color, from six primary colors, select four kinds of three primary colors combinations that do not overlap each other in advance.This chromatic diagram by Figure 11 illustrates, and determines which in four triangles be color to be shown belong to, and uses the three primary colors that form the affiliated triangular apex of this color to show this color.

In addition, determine that by providing color to be shown is positioned at the device in which zone of the three-dimensional color space that can be shown by four primaries, convert the tristimulus values of input to color picture signal as disclosed system among the JP-A.No.2000-338950.Under the situation of four primaries, can reproduce the color in the graphics shown in Figure 10 A.In JP-A.No.2000-338950, determine that color to be shown is comprised in which graphics of Figure 10 B in the 10E, use the hexahedral apex coordinate that surrounds this color, obtain the value of each primary colors by the calculating identical with " mathematic(al) representation 2 ".By using the coefficient of each primary colors of " mathematic(al) representation 2 " calculating chart 12B in the 12E, and check that all coefficients whether are all covered by 0 to 1 scope, should determine thereby carry out.

In JP-A.No.2004-152737, as the method that tristimulus values is converted to color picture signal, example by using pseudo inverse matrix to obtain the method for 3 * 4 inverse of a matrix conversion.

In addition, at collected papers of color forum JAPAN ' 97 (1997, a kind of method has been described the 13-16 page or leaf), wherein calculate the ratio of the coefficient of each corresponding primary colors, so that they have maximum brightness (its can by representing with the display that color to be shown has an identical xy chromaticity coordinate), so that multiply by this value, thereby obtain required brightness with each coefficient.

Summary of the invention

The general pattern signal is by three kinds of signal determined pixel colors.Particularly, rgb signal is stipulated a color of pixel by R signal, G signal and B signal.In addition, the YCrCb signal is specified a color of pixel by Y-signal, Cr signal and Cb signal.YIQ signal and YUV signal are by color of pixel of three signal regulations.In addition, the XYZ signal that is known as tristimulus values is also by three kinds of signals, and promptly X signal, Y-signal and Z signal are specified a color of pixel.In this application, one group is used for specifying three signals of a color of pixel to be known as " picture element signal ".Parallel or serially input form three signals of a picture element signal.Can form each signal in three signals by analog signal or digital signal.Under the situation of digital signal, can use the digital signal of two or more bit numbers.Can serial or parallel ground input have each bit of a signal of two or more bit numbers.After this, three signals that are used to specify a color of pixel are also referred to as " trichromatic signal ".In addition, in this application, not only determine a color by colourity, this color also has brightness as its attribute.In other words, even color has identical colourity, also different colors when they have different brightness.

In trichromatic conventional display, a pixel is made up of three sub-pixels of different colours, so that each signal level of three sub-pixels can be determined from the three primary colors of input.In this case, can come to determine uniquely the signal level (intensity of the color of each sub-pixel) of three sub-pixels according to the tricolor signal of being imported.Under the situation that a pixel is made up of the sub-pixel of four or more different colours, not separating when calculating the signal level of four or more sub-pixels from the tricolor signal of input always can be determined uniquely.The present inventor finds, thereby constituting in the display of pixel acquisition image by the sub-pixel of layout in a zone corresponding to different colours, the existence of the sub-pixel of not lighted may cause the vision in the display to disturb (visual interception).Then, they find, can prevent the vision interference by more sub-pixels of lighting in the pixel.In addition, in each sub-pixel, its characteristic is lighted history according to it and is changed.The difference (for example luminance difference when same signal driven element pixel) of the characteristic between this sub-pixel that can cause always lighting the sub-pixel of time length and lighting the time weak point.The present inventor finds, by showing the color of being come appointment by the input signal of lighting more sub-pixels, is not easy to cause the difference of the characteristic between the sub-pixel in long-time.Each sub-pixel is driven by the signal of the intensity of the color of specifying sub-pixel, thereby feasible can the acquisition disturbs the signal of the intensity of specifying each color to be not easy to become 0 advantage by carrying out signal processing reduction vision, has the advantage of property difference in perhaps obtaining to prevent for a long time.

To achieve these goals, the invention provides a kind of signal processing method, this signal processing method comprises the steps:

Import three signals, these three signals are specified a color of pixel; And

Produce four signals from three signals of input, each signal indication in wherein said four signals is used for showing by colour mixture the intensity of four kinds of corresponding a kind of colors of different colours of a color of pixel,

Wherein said generation step comprises:

First switch process, two signals of the intensity of two kinds of colors of the four kinds of colors of three conversion of signals one-tenth expressions that are used for to import, and the signal of intensity of expression blend color, wherein this blend color be by mix (a) these four kinds of colors or (b) the multiple color in these four kinds of colors obtain; And

Second switch process, the conversion of signals that is used for the intensity of this expression blend color is a plurality of signals, these a plurality of signal indications comprise the intensity of the multiple color of other the two kind colors different with these two kinds of colors at least.

Description of drawings

Fig. 1 shows the formation example according to hardware of the present invention;

Fig. 2 shows other formation examples according to hardware of the present invention;

Fig. 3 shows another other formation examples according to hardware of the present invention;

Fig. 4 is the xy chromatic diagram of the xy chromaticity coordinate of expression first embodiment;

Fig. 5 is the xy chromatic diagram of the xy chromaticity coordinate of expression second embodiment;

Fig. 6 is the view that the color region of the 4th embodiment is shown by three-dimensional vector;

Fig. 7 is the block diagram according to the data converting circuit of this embodiment;

Fig. 8 is the block diagram according to the television equipment of this embodiment;

Fig. 9 is the view that shows the color region of three primary display by three-dimensional vector;

Figure 10 is an xy chromatic diagram of representing the color region of three primary display by three-dimensional vector;

Figure 11 is the xy chromatic diagram of the color region of disclosed first example among the expression JP-A.No.6-261332; And

Figure 12 is a view of representing the color region of JP-A.No.2000-261332 by three-dimensional vector.

Embodiment

With reference to the accompanying drawings, below will be used to carry out optimal mode of the present invention by illustrating to describe in detail.Yet scope of the present invention is not limited thereto tolerance, material, shape and the relative position thereof etc. of the parts of describing among the embodiment, except as otherwise noted.In addition, in the following description, identical or corresponding element is endowed identical Reference numeral.

(embodiment of television equipment)

At first, can use television equipment of the present invention with reference to figure 8 descriptions.Fig. 8 is the block diagram according to television equipment of the present invention.Television equipment disposes set-top box (STB) 501 and image-display units 502.

Set-top box (STB) 501 has receiving circuit 503 and I/F part 504.Receiving circuit 503 is made up of tuner and decoder etc., and it receives TV signal and data broadcasting such as satellite broadcasting and surface wave by network etc., and to the view data of I/F part 504 output decoders.I/F part 504 is converted to the display format of image-display units 502 with view data, so that view data is outputed in the image-display units 502.

Image-display units 502 has display panel 200, control circuit 505 and drive circuit 506.The image processing that included control circuit 505 will be suitable for image display 200 in the image-display units 502 is for example revised and is applied to input image data, and view data and various control signal are outputed to drive circuit 506.As an example of control circuit 505, can consider the timing generator circuit 404 among Fig. 7.Drive circuit 506 outputs to display panel 200 based on input image data with drive signal, and this makes television image be presented on the display panel 200.As the example of drive circuit 506, can consider modulation circuit 402 or scanning circuit 403 among Fig. 7.As the example of display panel 200, as shown in Figure 7, in following examples, can consider multiple electron source 401.As multiple electron source 401, for example can use such as various display panels such as FED, PDP, LCD display, LED and EL displays.

In addition, receiving circuit 503 can be used as set-top box (STB) 501 with I/F part 504 and leaves in the chassis different with the chassis of image-display units 502, and perhaps it can leave in the identical chassis with image-display units 502.

As shown in Figure 7, the drive circuit that is used to drive multiple electron source 401 comprises modulation circuit 402, scanning circuit 403, timing generator circuit 404, data converting circuit 405, multiple electron source 406 and scanning power circuit 407.The part of the image displaying part in this drive circuit composing images display unit.

Multiple electron source 401 has surface conductive type electronic emitter element 1001 as display element.At this, use surface conductive type electronic emitter element as display element, yet, as display element, can use such as the electronic emitter element of Spindt type and the various elements of electroluminescence electronics.Under the situation of electronic emitter element of using such as surface conductive type electronic emitter element,, electronic emitter element electrons emitted produces light by being shone fluorophor as display element.Because this light and display image.Can be by control the brightness of this light in the scheduled time from the exposure of the electronics of electronic emitter element.Exposure from the electronics of electronic emitter element can be controlled by the size and the time width of the voltage that will be applied to the electronic emitter element.Thereby poor between the electromotive force that can be by the gated sweep signal and the electromotive force of modulation signal and at the application time of the time frame internal modulation signal that is used to apply sweep signal obtains required exposure.According to present embodiment, a pixel is made of red sub-pixel, blue subpixels, green sub-pixels and cyan sub-pixel.In addition, a sub-pixel in the present embodiment is made up of one or more electronic emitter elements and a luminous element, when electronics when these electronic emitter elements are launched, this luminous element emission is red, green, blue, the light of any color in the cyan.

Multiple electron source 401 has a plurality of scanning lines 1002 and a plurality of modulation wiring 1003, and they connect a plurality of display elements, so that by a matrix driving.Sweep signal is applied to these scanning lines 1002, and modulation signal is applied to modulation wiring 1003.

Modulation circuit 402 is the circuit that generate modulation signal according to the modulating data of input.Modulation circuit 402 serves as the modulating device that the modulation signal that will modulate based on the modulating data of importing from data converting circuit 405 offers row mode (column-wise) wiring that will be connected to a plurality of electron sources respectively.

Scanning circuit 403 connects in the line mode wiring of multiple electron source 401, and serves as and will select signal (sweep signal) to offer the circuit of scanning lines, and the display element that be driven by the output of modulation circuit 402 is connected to this scanning lines.In general, carry out the linear precedence scanning sequentially select delegation successively, however present embodiment be not limited thereto, also can carry out interlacing scan, multirow is selected and the zone is selected.In other words, scanning circuit 403 serves as such choice device: in the given time, selected electromotive force is offered the wiring of line mode, wherein the wiring of this line mode is connecting in a plurality of electron sources that comprised in the multiple electron source 401 and to want driven a plurality of electron sources, other times then provide non-selected electromotive force, and select delegation.

Timing generator circuit 404 is the circuit that are used to generate the timing signal of modulation circuit 402, scanning circuit 403 and data converting circuit 405.

Data converting circuit 405 is the circuit that the tricolor signal of input are converted to the four primaries signal.The four primaries signal is the set of four signals, shows a color of pixel in order to the intensity of stipulating four different colours so that pass through blend color.Owing to these four signals, stipulated the negative load condition of the sub-pixel of four kinds of different colours.According to present embodiment, the intensity of color is equivalent to photoemissive intensity in this color.Photoemissive intensity can be by will being applied to display element the wave height value size of driven waveform and the duration of driven waveform control.In addition, data converting circuit 405 is a kind of like this circuit, it carries out data transaction, with gradient (gradation) data (brightness data) that will represent the outside brightness that multiple electron source 401 is required be converted to be fit to modulation circuit 402 be driven the Wave data form.

＜the first embodiment 〉

In the display that uses present embodiment, a pixel is made up of mutually different four kinds of colors (four sub-pixels).At this, each color is R (redness), G (green), C (cyan) and B (blueness).Yet every kind of color of sub-pixel is not limited to these color combinations.After this, every kind of sub-pixel color is called " primary colors ".In the XYZ chromaticity coordinate under the maximum brightness of every kind of primary colors, R be defined as (XR, YR, ZR), G be defined as (XG, YG, ZG), C be defined as (XC, YC, ZC), B be defined as (XB, YB, ZB).By with a kind of blending ratio (k, l, m, n) synthetic four kinds of primary colors and the blend color that obtains are defined as A (ZA), and this blend color are by " mathematic(al) representation 5 " definition (corresponding to " linear combination " of the present invention) for XA, YA.Blend color A is converted into a plurality of primary colors by " mathematic(al) representation 10 ".Therefore, blend color A is preferably by mixing all four kinds of colors that primary colors obtains.In other words, blending ratio is preferably 0＜k, l, m, n≤1.

Blending ratio can be set in advance in the form, as the predetermined mix ratio that obtains to be used for the value that the best watches, perhaps the combination of a plurality of coefficients can be set in the form, makes blending ratio dynamically to change according to the size of each component of the tricolor signal of input.In addition, blending ratio is set for to make the luminance difference of each pixel reduce be preferred.

＜mathematic(al) representation 5 〉

$\left\{\begin{array}{c}A=k\&times;R+l\&times;G+m\&times;C+n\&times;B\\ X_A=k\&times;X_R+l\&times;X_G+m\&times;X_C+n\&times;X_B\\ Y_A=k\&times;Y_R+l\&times;Y_G+m\&times;Y_C+n\&times;Y_B\\ Z_A=k\&times;Z_R+l\&times;Z_G+m\&times;Z_C+n\&times;Z_B\end{array}\right.$

Fig. 4 shows four primaries R, G, C and B according to present embodiment and blend color A by the xy chromatic diagram.In Fig. 4, by the square RGCB area surrounded color region that is display.In this case, the xy chromaticity coordinate of blend color A is positioned at the color region of display.

Suppose the user wish will by the random color D of the tricolor signal indication of input (XD, YD, ZD) be converted to will by four primaries represent by the indicated color D of four primaries signal (four primaries R, G, C and B).

At first, each combination (RGA for four kinds of combinations of two kinds of primary colors in the four primaries and blend color A, GCA, CBA and RBA) carry out matrix computations, so that obtain to be used for the coefficient of two kinds of primary colors by three kinds of color showing color D and the coefficient (mathematic(al) representation 6 to 9) of blend color A.The step that obtains the coefficient of these two kinds of primary colors and blend color is equal to according to first switch process of the present invention.The coefficient of blend color A can obtain in all four kinds of combinations.

＜mathematic(al) representation 6 〉

$\left(\begin{array}{c}{r}_{11}\\ g_{11}\\ a_{11}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_A\\ Y_R& Y_G& Y_A\\ Z_R& Z_G& Z_A\end{array}\right)}^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 7 〉

$\left(\begin{array}{c}{g}_{12}\\ c_{12}\\ a_{12}\end{array}\right)={\left(\begin{array}{ccc}{X}_G& X_C& X_A\\ Y_G& Y_C& Y_A\\ Z_G& Z_C& Z_A\end{array}\right)}^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 8 〉

$\left(\begin{array}{c}{c}_{13}\\ b_{13}\\ a_{13}\end{array}\right)={\left(\begin{array}{ccc}{X}_C& X_B& X_A\\ Y_C& Y_B& Y_A\\ Z_C& Z_B& Z_A\end{array}\right)}^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 9 〉

$\left(\begin{array}{c}{r}_{14}\\ b_{14}\\ a_{14}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_B& X_A\\ Y_R& Y_B& Y_A\\ Z_R& Z_B& Z_A\end{array}\right)}^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

Coefficient r11 wherein, g11 and a11 are respectively the coefficient of two kinds of primary colors R and G and the coefficient of blend color A.Specifically, r11 represents to be used to indicate the signal of red intensity, and g11 represents to be used to indicate the signal of green intensity, and a11 represents to be used to indicate the signal of the intensity of the blend color that has wherein mixed four primaries.In Fig. 4, color D is included among the region R GA.Say respectively, coefficient g12, c12 and a12 are the coefficient of two kinds of primary colors G and C and the coefficient of blend color A, coefficient c13, b13 and a13 are the coefficient of two kinds of primary colors C and B and the coefficient of blend color A, and coefficient r14, b14 and a14 are the coefficient of two kinds of primary colors R and B and the coefficient of blend color A.When the value of the coefficient of every kind of primary colors was zero, the light of this primary colors extinguished, and on duty be to represent maximum brightness intensity at 1 o'clock.At this, the value of supposing each coefficient is got the value in from 0 to 1 scope; Yet, be preferred by this signal of Digital Signal Processing.For example, this signal by bit number be 8 or the digital signal of more bits (promptly in binary digit, get from 0 to 255 or the signal of the value of bigger scope) to handle be preferred.

Suppose that color D to be shown is positioned at (inside of the triangle RGA on the xy chromatic diagram) on the xy position shown in Figure 4.In this case, all coefficient r11, g11, the a11 that represents color D " mathematic(al) representation 6 " by two kinds of primary colors R and G and blend color A is for just.In the another kind combination, the value of any coefficient is for negative.The coefficient of the coefficient of two kinds of primary colors and blend color A has all been indicated color D for the positive fact can be by these three kinds of color showings.Therefore, select this combination.

Blend color A can be represented by four primaries R, G, C and B shown in " mathematic(al) representation 5 ".In other words, be used for showing that by positive coefficient a11 coefficient rA, gA, cA and the bA of four primaries R, G, C and B of blend color A is shown in " mathematic(al) representation 10 ".In " mathematic(al) representation 10 ", blend color is converted into four primaries (signal of the intensity of four kinds of colors of expression composition blend color) according to blending ratio.This conversion is equal to according to second switch process of the present invention.Because in the signal of the intensity of the four kinds of colors of indication that obtain by this second switch process, indicated the signal of the intensity of color C and color B in first switch process, not obtain, therefore will this signal and first switch process in the signal that obtains synthesize.Therefore, the signal that obtains in second switch process can be maintained the original state output to the back level.Yet to color R and the color G in four kinds of signals that obtain in second switch process, owing to also obtain useful signal in first switch process, therefore the signal that obtains in the signal that obtains in first switch process and second switch process synthesizes.This synthetic can realization by the phase Calais simply.Yet this is not limited to simple addition.For example, also carrying out in the configuration of predetermined computation for four signals, can be by carrying out predetermined computation and addition additional object signal in advance.As mentioned above, also can obtain to be used for coefficient rD, gD, cD and the bD (mathematic(al) representation 11) of four primaries R, G, C and the B of display-object color D.At this,, also can obtain coefficient rD, gD, cD and the bD of four primaries R, G, C and the B shown in the mathematic(al) representation 11 even the coefficient k of rA in the mathematic(al) representation 10 and gA and l are zero.In other words, blend color can be by mixing at least two kinds of colors that primary colors obtains in the four primaries.For example, if use color on the straight line that connects color C and color B in the chromatic diagram of Fig. 4 as blend color A, then blend color A only is divided into color C and color B.Thereby, can be used as four signals of intensity that indication is used for showing by blend color four kinds of colors of a color of pixel to the signal of color C that obtains in the signal of color R that obtains in first switch process and color G and second switch process and color B, and not carry out synthesis step.In addition, also have a kind of method, the method for the size of the component of the tricolor signal of its use input comprises the method for the coefficient combination of any zero coefficient as selection.For example, the size of any component (for example surpasses predetermined value in the tricolor signal of input, predetermined value " 192 " in the scope from minimum " 0 " to peak " 255 "), the coefficient that then can select wherein to surpass the component of predetermined value from table is zero coefficient combination.

＜mathematic(al) representation 10 〉

$\left\{\begin{array}{c}{r}_A=k\&times;a_{11}\\ g_A=l\&times;a_{11}\\ c_A=m\&times;a_{11}\\ b_A=n\&times;a_{11}\end{array}\right.$

＜mathematic(al) representation 11 〉

$\left\{\begin{array}{c}{r}_D={\mathrm{<figure-callout\; id="11"\; label="r"\; filenames="C20061015177400321.png"\; state="\{\{state\}\}">r</figure-callout>}}_{11}+r_A={\mathrm{<figure-callout\; id="11"\; label="r"\; filenames="C20061015177400321.png"\; state="\{\{state\}\}">r</figure-callout>}}_{11}+k\&times;a_{11}\\ g_D={\mathrm{<figure-callout\; id="11"\; label="g"\; filenames="C20061015177400321.png"\; state="\{\{state\}\}">g</figure-callout>}}_{11}+g_A={\mathrm{<figure-callout\; id="11"\; label="g"\; filenames="C20061015177400321.png"\; state="\{\{state\}\}">g</figure-callout>}}_{11}+l\&times;a_{11}\\ c_D=c_A\\ b_D=b_A\end{array}\right.$

When color D belongs to other when zone, the coefficient of two primary colors that selection can Show Color D and the coefficient of blend color A be on the occasion of combination, and calculate in the same manner, can obtain the coefficient of four primaries.

According to present embodiment, when the four primaries signal that tricolor signal is converted to by four kinds of former colour specifications, tricolor signal is converted into three kinds of colors that comprise blend color, makes coefficient calculations become simple.In other words, when the signal number that will be transfused to is identical with the signal number that will obtain in a switch process, obtain easily to separate, in addition, if in advance inverse matrix is stored in memory etc., then in the calculating of the coefficient shown in the mathematic(al) representation 6 to 10, can only carry out addition and multiply each other.In addition, the coefficient of four primaries be on the occasion of, unless color is positioned on farthest the profile (outline).As a result, just become owing to represent each signal component of the four primaries of four primaries signal, so can light whole four sub-pixels.

＜the second embodiment 〉

To describe the example according to the display of present embodiment below, in the present embodiment, a pixel is made up of four primaries R, G, C and B.Suppose in the XYZ chromaticity coordinate, R be (XR, YR, ZR), G be (XG, YG, ZG), C be (XC, YC, ZC), and B be (XB, YB, ZB).

At this, using four primaries to show that (XD, YD ZD) under the situation of the random color D in, will make up for all three primary colors in the four primaries XYZ chromaticity coordinate, and promptly (RCB RGB) carries out matrix computations for RGC, GCB.For each combination in four kinds of combinations, acquisition is used for three coefficients (mathematic(al) representation 12 to 15) by three primary colors Show Color D.Thereby, can obtain different trichromatic four kinds of combinations.

＜mathematic(al) representation 12 〉

$\left(\begin{array}{c}{r}_{21}\\ g_{21}\\ c_{21}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_C\\ Y_R& Y_G& Y_C\\ Z_R& Z_G& Z_C\end{array}\right)}^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 13 〉

$\left(\begin{array}{c}{g}_{22}\\ c_{22}\\ b_{22}\end{array}\right)={\left(\begin{array}{ccc}{X}_G& X_C& X_B\\ Y_G& Y_C& Y_B\\ Z_G& Z_C& Z_B\end{array}\right)}^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 14 〉

$\left(\begin{array}{c}{r}_{23}\\ c_{23}\\ b_{23}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_C& X_B\\ Y_R& Y_C& Y_B\\ Z_R& Z_C& Z_B\end{array}\right)}^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 15 〉

$\left(\begin{array}{c}{r}_{24}\\ g_{24}\\ b_{24}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_B\\ Y_R& Y_G& Y_B\\ Z_R& Z_G& Z_B\end{array}\right)}^{-1}\&CenterDot;\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

Wherein coefficient r21, g21 and c21 are respectively the coefficients of three primary colors R, G and C.Coefficient r24, g24 and b24 are respectively the coefficients of three primary colors R, G and B.In Fig. 5, color D is included among region R GC and the region R GB.Coefficient g22, c22 and b22 and coefficient r23, c23 and b23 are respectively the coefficient of three primary colors R, G and C and the coefficient of three primary colors R, C and B.When the value of the coefficient of each primary colors was " zero ", this primary colors was extinguished, and when its value is 1, the photoemissive maximum brightness intensity of this former colour specification.

When color D to be shown was positioned at xy position shown in Figure 5, the xy chromaticity coordinate of color D was arranged within the region R GC and region R GB of chromatic diagram.In other words, show by three primary colors R, G and C coefficient r21, the g21 of " mathematic(al) representation 12 " of color D and each coefficient among the c21 all get on the occasion of, and show by three primary colors R, G and B coefficient r24, the g24 of " mathematic(al) representation 15 " of color D and each coefficient among the b24 all get on the occasion of.In other combinations, the value of any coefficient is all got negative value.All three primary colors get on the occasion of the fact mean that color D can be shown by these three kinds of colors, and will select this combination.

Therefore, all coefficients that will select to make Show Color D from the four kinds of combinations (mathematic(al) representation 12 to 15) that are used for Show Color D on the occasion of two kinds of combinations.

Coefficient rD, the gD, cD and the bD that are used for four primaries R, G, C and the B of display-object color D will be weighted on average (to synthesize) and obtain (mathematic(al) representation 16) by each the value of coefficient to three primary colors R, the G of selected two kinds of combinations and C and three primary colors R, G and B.

Therefore, by using six coefficients relevant shown in mathematics expression formula 16, these values to be weighted with average with selected two kinds of combinations, coefficient rD, gD, cD and the bD that can synthesize four primaries R, G, C and B prevent that simultaneously the colourity of each combination of selected two kinds of combinations from significantly changing.As a result, the tricolor signal of input can be converted to the four primaries signal, and the colourity of selected two kinds of combinations does not significantly change before conversion and afterwards.In other words, can synthesize the corresponding tricolor signal of two kinds of combinations that show same color D, keep colourity simultaneously.

＜mathematic(al) representation 16 〉

$\left\{\begin{array}{c}{r}_D=s\&times;r_{21}+t\&times;r_{24}\\ g_D=s\&times;g_{21}+t\&times;g_{24}\\ c_D=s\&times;c_{21}\\ b_D=t\&times;b_{24}\\ s+t=1,(s.t>0)\end{array}\right.$

In addition, when color D is arranged in other zones, select three primary colors all have on the occasion of two kinds of combinations, the coefficient of every kind of primary colors can be weighted and be average.Except weighted average, can utilize arithmetic average, weighted arithmetic mean, geometric average or weighted geometric mean, so that keep colourity and synthetic three primary colors (predetermined synthetic the processing).

The scope that is used for " maintenance colourity " according to present embodiment is the human scope that visually can not identify change color.Specifically, define the scope of " maintenance colourity " by the colour-difference of u ' v ' colourity of calculating according to xy colourity, this scope is preferably the scope (scope that keeps colourity substantially) of " Δ u ' v '＜=0.015 ".

To obtain u ' and v ' as described below according to the XYZ tristimulus values:

That is,

u′＝4X/(X+15Y+3Z)

v′＝9Y/(X+15Y+3Z)

Perhaps, according to the xy chromaticity coordinate,

u′＝4X/(-2X+12Y+3)

v′＝9Y/(-2X+12Y+3)

At this, suppose that the colourity when three signals that obtained in by a combination in two combinations the preceding come display pixel is (u ' 1, v ' 1); Colourity when three signals being obtained come display pixel in by another combination in these two combinations is (u ' 2, v ' 2); And the colourity when coming display pixel by four signals that obtained as synthetic result be (u ', v '), obtain Δ u ' v '={ (u '-u ' 1) 2+ (v '-v ' 1) 2} (1/2) and Δ u ' v '={ (u '-u ' 2) 2+ (v '-v ' 2) 2} (1/2).

In these equations any all can illustrate and be not more than 0.015 value.

Particularly, when in " mathematic(al) representation 16 ", having set up s=t=1/2, can reach this requirement easily.

According to present embodiment, under the situation that tricolor signal is converted to the four primaries signal of being represented by four primaries, the three primary colors of tricolor signal are converted to the three primary colors in the four primaries, make the calculating of coefficient become simple.In addition, if in advance inverse matrix is stored in memory etc., then in the calculating of the coefficient shown in the mathematic(al) representation 12 to 15, only carry out addition and multiplication.In addition, by synthetic six positive coefficients, can obtain the coefficient of four primaries R, G, C and B about trichromatic two kinds of combinations.Thereby, the coefficient of four primaries be on the occasion of, unless color is positioned at profile farthest.As a result, because it is positive to represent that each signal component of the four primaries of four primaries signal becomes, can be lighted so form all four sub-pixels of a pixel.

＜the three embodiment 〉

According to first and second embodiment, depend on the value of blend color A and the value of color D, any one coefficient among four primaries R, G, C and the B can surpass 1.In this case, seek 1 with the value that surpasses 1 coefficient between difference and by other former colour specifications this is poor, the coefficient of all primary colors can be got from 0 to 1 value.For example, when the value of the coefficient of primary colors R is " 1.1 ", then the difference between " 1.1 " and " 1 " promptly " 0.1 " will replace by other trichromatic coefficients.

Obtain the coefficient of the primary colors when each primary colors is represented by other three primary colors at first, in advance." mathematic(al) representation 17 " is the mathematic(al) representation when R is represented by G, C and B; " mathematic(al) representation 18 " is the mathematic(al) representation when G is represented by R, C and B; " mathematic(al) representation 19 " is the mathematic(al) representation when C is represented by R, G and B; " mathematic(al) representation 20 " is the mathematic(al) representation when B is represented by R, G and C.

＜mathematic(al) representation 17 〉

$\left(\begin{array}{c}{g}_R\\ c_R\\ b_R\end{array}\right)={\left(\begin{array}{ccc}{X}_G& X_C& X_B\\ Y_G& Y_C& Y_B\\ Z_G& Z_C& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_R\\ Y_R\\ Z_R\end{array}\right)$

＜mathematic(al) representation 18 〉

$\left(\begin{array}{c}{r}_G\\ c_G\\ b_G\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_C& X_B\\ Y_R& Y_C& Y_B\\ Z_R& Z_C& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_G\\ Y_G\\ Z_G\end{array}\right)$

＜mathematic(al) representation 19 〉

$\left(\begin{array}{c}{r}_C\\ g_C\\ b_C\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_B\\ Y_R& Y_G& Y_B\\ Z_R& Z_G& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_C\\ Y_C\\ Z_C\end{array}\right)$

＜mathematic(al) representation 20 〉

$\left(\begin{array}{c}{r}_B\\ g_B\\ c_B\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_C\\ Y_R& Y_G& Y_C\\ Z_R& Z_G& Z_C\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_B\\ Y_B\\ Z_B\end{array}\right)$

Wherein coefficient (gR, cR, bR), coefficient (rG, cG, bG), coefficient (rC, gC, bC) and coefficient (cB) in each all is the coefficient when primary colors R, primary colors G, primary colors C and primary colors B are represented by other three primary colors respectively for rB, gB.Because XR, YR, ZR, XG, YG, ZG, XC, YC, ZC, XB, YB and ZB are fixed values, so the member on " mathematic(al) representation 17 " to " mathematic(al) representation 20 " right side also becomes fixed value.

For example, when the value of coefficient rD, gD, cD and the bD of each primary colors R, G, C and the B shown in " mathematic(al) representation 11 " or " mathematic(al) representation 16 " surpasses 1, suppose that the difference between these values and 1 is not rO, gO, cO and bO, then poor rO, gO, cO and bO are respectively rO=rD-1, gO=gD-1, cO=cD-1, and bO=bD-1.Be used for other trichromatic coefficients, shown in " mathematic(al) representation 21 " to " mathematic(al) representation 24 " that obtain from following " mathematic(al) representation 17 " to " mathematic(al) representation 20 " by this difference of other former colour specifications.

＜mathematic(al) representation 21 〉

$\left\{\begin{array}{c}{g}_{\mathrm{OR}}=g_R\&times;r_O\\ c_{\mathrm{OR}}=c_R\&times;r_O\\ b_{\mathrm{OR}}=b_R\&times;r_O\end{array}\right.$

＜mathematic(al) representation 22 〉

$\left\{\begin{array}{c}{r}_{\mathrm{OG}}=r_G\&times;g_O\\ c_{\mathrm{OG}}=c_G\&times;g_O\\ b_{\mathrm{OG}}=b_G\&times;g_O\end{array}\right.$

＜mathematic(al) representation 23 〉

$\left\{\begin{array}{c}{r}_{\mathrm{OC}}=r_C\&times;c_O\\ g_{\mathrm{OC}}=g_C\&times;c_O\\ b_{\mathrm{OC}}=b_C\&times;c_{\text{O}}\end{array}\right.$

＜mathematic(al) representation 24 〉

$\left\{\begin{array}{c}{r}_{\mathrm{OB}}=r_B\&times;b_O\\ g_{\mathrm{OB}}=g_B\&times;b_O\\ c_{\mathrm{OB}}=c_B\&times;b_O\end{array}\right.$

For example, when the coefficient of the primary colors R that obtains among first embodiment or second embodiment surpass as the peak among the R 1 the time, obtain the difference between the value and 1 of R to be fitted on the coefficient of three primary colors G, C and B by use " mathematic(al) representation 21 ".Then, in the coefficient that is added to each primary colors by gOR, the cOR that will obtain and bOR, obtain the final coefficient (rD ', gD ', cD ', bD ') (mathematic(al) representation 25) of four primaries R, G, C, B.

＜mathematic(al) representation 25 〉

$\left\{\begin{array}{c}{r}_D^{\&prime;}=1\\ g_D^{\&prime;}=g_D+g_{\mathrm{OR}}=g_D+g_R\&times;r_O=g_D+g_R\&times;(r_D-1)\\ c_D^{\&prime;}=c_D+c_{\mathrm{OR}}=c_D+c_R\&times;r_O=c_D+c_R\&times;(r_D-1)\\ b_D^{\&prime;}=b_D+b_{\mathrm{OR}}=b_D+b_R\&times;r_O=b_D+b_R\&times;(r_D-1)\end{array}\right.$

In an identical manner, when the coefficient of primary colors G, C and B surpasses 1 the coefficient of final four primaries R, G, C and B shown in " mathematic(al) representation 26 " to " mathematic(al) representation 28 ".

＜mathematic(al) representation 26 〉

$\left\{\begin{array}{c}{r}_D^{\&prime;}=r_D+r_{\mathrm{OG}}=r_D+r_G\&times;g_O=r_D+r_G\&times;(g_D-1)\\ g_D^{\&prime;}=1\\ c_D^{\&prime;}=c_D+c_{\mathrm{OG}}=c_D+c_G\&times;g_O=c_D+c_G\&times;(g_D-1)\\ b_D^{\&prime;}=b_D+b_{\mathrm{OG}}=b_D+b_G\&times;g_O=b_D+b_G\&times;(g_D-1)\end{array}\right.$

＜mathematic(al) representation 27 〉

$\left\{\begin{array}{c}{r}_D^{\&prime;}=r_D+r_{\mathrm{OC}}=r_D+r_C\&times;c_O=r_D+r_C\&times;(c_D-1)\\ g_D^{\&prime;}=g_D+g_{\mathrm{OC}}=g_D+g_C\&times;c_O=g_D+g_C\&times;(c_D-1)\\ c_D^{\&prime;}=1\\ b_D^{\&prime;}=b_D+b_{\mathrm{OC}}=b_D+b_C\&times;c_O=b_D+b_C\&times;(c_D-1)\end{array}\right.$

＜mathematic(al) representation 28 〉

$\left\{\begin{array}{c}{r}_D^{\&prime;}=r_D+r_{\mathrm{OB}}=r_D+r_B\&times;b_O=r_D+r_B\&times;(b_D-1)\\ g_D^{\&prime;}=g_D+g_{\mathrm{OB}}=g_D+g_B\&times;b_O=g_D+g_B\&times;(b_D-1)\\ c_D^{\&prime;}=c_D+c_{\mathrm{OB}}=c_D+c_B\&times;b_O=c_D+c_B\&times;(b_D-1)\\ b_D^{\&prime;}=1\end{array}\right.$

＜the four embodiment 〉

In the display according to present embodiment, a pixel is made up of four kinds of primary colors, and to make each primary colors be R, G, C and B.Each XYZ chromaticity coordinate of these primary colors is as follows respectively: R be (XR, YR, ZR), G be (XG, YG, ZG), C be (XC, YC, ZC), B be (XB, YB, ZB).

The color region that can be shown by this display is such zone, and (Fig. 6) can be represented by the linear combination of each primary vector (being equal to " base vector " of the present invention) in this zone.

Suppose the user wish by four primaries show random color D (XD, YD, ZD).

About using the three primary colors combination in the four primaries, that is, and RGC (Fig. 6 B), GCB (Fig. 6 C), RCB (Fig. 6 D) and RGB (Fig. 6 E); And the combination of coefficient that comprises other color of combinations thereof and peak 1, be RGC+B (Fig. 6 F), GCB+R (Fig. 6 G), RCB+G (Fig. 6 H) and RGB+C (Fig. 6 I), will obtain the coefficient of four primaries R, G, C and the B of expression color D by using " mathematic(al) representation 29 " to " mathematic(al) representation 36 ".For following combination, promptly RGC+B (Fig. 6 F), GCB+R (Fig. 6 G), RCB+G (Fig. 6 H) and RGB+C (Fig. 6 I) will obtain four signals from three signals.Yet,, should obtain three signals by calculating according to three input signals in each switch process because four signals that will obtain comprise the signal of fixed value 1.Therefore, can easily obtain these combinations in the same manner with the 3rd embodiment.

＜mathematic(al) representation 29 〉

$\left(\begin{array}{c}{r}_{31}\\ g_{31}\\ c_{31}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_C\\ Y_R& Y_G& Y_C\\ Z_R& Z_G& Z_C\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 30 〉

$\left(\begin{array}{c}{g}_{32}\\ c_{32}\\ b_{32}\end{array}\right)={\left(\begin{array}{ccc}{X}_G& X_C& X_B\\ Y_G& Y_C& Y_B\\ Z_G& Z_C& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 31 〉

$\left(\begin{array}{c}{r}_{33}\\ c_{33}\\ b_{33}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_C& X_B\\ Y_R& Y_C& Y_B\\ Z_R& Z_C& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 32 〉

$\left(\begin{array}{c}{r}_{34}\\ g_{34}\\ b_{34}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_B\\ Y_R& Y_G& Y_B\\ Z_R& Z_G& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_D\\ Y_D\\ Z_D\end{array}\right)$

＜mathematic(al) representation 33 〉

$\left(\begin{array}{c}{r}_{35}\\ g_{35}\\ c_{35}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_C\\ Y_R& Y_G& Y_C\\ Z_R& Z_G& Z_C\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_D-X_B\\ Y_D-Y_B\\ Z_D-Z_B\end{array}\right)$

＜mathematic(al) representation 34 〉

$\left(\begin{array}{c}{g}_{36}\\ c_{36}\\ b_{36}\end{array}\right)={\left(\begin{array}{ccc}{X}_G& X_C& X_B\\ Y_G& Y_C& Y_B\\ Z_G& Z_C& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_D-X_R\\ Y_D-Y_R\\ Z_D-Z_R\end{array}\right)$

＜mathematic(al) representation 35 〉

$\left(\begin{array}{c}{r}_{37}\\ c_{37}\\ b_{37}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_C& X_B\\ Y_R& Y_C& Y_B\\ Z_R& Z_C& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_D-X_G\\ Y_D-Y_G\\ Z_D-Z_G\end{array}\right)$

＜mathematic(al) representation 36 〉

$\left(\begin{array}{c}{r}_{38}\\ g_{38}\\ b_{38}\end{array}\right)={\left(\begin{array}{ccc}{X}_R& X_G& X_B\\ Y_R& Y_G& Y_B\\ Z_R& Z_G& Z_B\end{array}\right)}^{-1}\left(\begin{array}{c}{X}_D-X_C\\ Y_D-Y_C\\ Z_D-Z_C\end{array}\right)$

All trichromatic coefficients be on the occasion of the fact mean that color D can be by these three kinds of color showings, and will select this combination.To " mathematic(al) representation 36 ", only there are three value on the left sides to illustrate from " mathematic(al) representation 33 " respectively.Yet the combination of separating comprises and is the value of fixed value 1 one by one, and this causes three input signals to be converted into three signals as three parameters, and the signal of the intensity of four kinds of colors being made up of a signal that is a fixed value of expression.

At this, for example under color D is positioned at when the coefficient of primary colors B is 1 situation on the hexahedron of being represented by the combination of the combination of three primary colors RGB and three primary colors RGC, " mathematic(al) representation 32 " to the value of all coefficients of " mathematic(al) representation 33 " all be on the occasion of.By selecting these combinations, and the coefficient value of average each primary colors of weighted sum, obtain to be used for coefficient rD, gD, cD and the bD (mathematic(al) representation 37) of the four primaries RGCB of display-object color D.

＜mathematic(al) representation 37 〉

$\left\{\begin{array}{c}{r}_D=s\&times;{\mathrm{<figure-callout\; id="34"\; label="r"\; filenames="C20061015177400341.png"\; state="\{\{state\}\}">r</figure-callout>}}_{34}+t\&times;r_{35}\\ g_D=s\&times;{\mathrm{<figure-callout\; id="34"\; label="g"\; filenames="C20061015177400341.png"\; state="\{\{state\}\}">g</figure-callout>}}_{34}+t\&times;g_{35}\\ c_D=t\&times;c_{35}\\ b_D=s\&times;{\mathrm{<figure-callout\; id="34"\; label="b"\; filenames="C20061015177400341.png"\; state="\{\{state\}\}">b</figure-callout>}}_{34}+t\&times;1\\ s+t=1,(s.t>0)\end{array}\right.$

If color D is positioned at other zones, select all trichromatic coefficients on the occasion of two kinds of combinations, can weighted sum the coefficient of average each primary colors.

According to the present invention, owing to, therefore can light all four primaries as much as possible by using trichromatic two kinds of combinations to obtain the four primaries of RGCB.

＜the five embodiment 〉

Fig. 1 shows by the example of hardware realization according to the handling procedure of the first and the 3rd embodiment.In this accompanying drawing, Reference numeral 1 to 4 expression is used for trichromatic input signal is converted to the transducer of the blend color A that obtains by two kinds of primary signals that synthesize four primaries and four primaries; Whether device is determined in Reference numeral 5 to 8 expression, be used for determining from all outputs of transducer 1 to 4 all for just; Reference numeral 9 presentation selectors are used for selecting all to be output as positive combination according to the definite result who determines device 5 to 8, and export this combination; Reference numeral 10 expression distributors (divider) are used for the conversion of signals of blend color A is become the four primaries signal; Reference numeral 11 expression synthesizers are used for two kinds of primary signals will exporting from selector 9 and the four primaries signal plus of exporting from distributor 10; Reference numeral 12 expression (excess) processor that overflows is used for carrying out and handles, and makes when comprising among the output result of synthesizer 11 that when being not less than 1 value, peak becomes 1.

In the present embodiment, identical up to the processing of synthesizer 11 with first embodiment, and processing the 3rd embodiment of the processor 12 that overflows is identical.

At first, the signal of X, Y and Z is input to respectively in the transducer 1 to 4.In transducer 1 to 4, carry out calculating, and export two kinds of primary signals and blend color signal respectively according to " mathematic(al) representation 6 " to " mathematic(al) representation 9 " of first embodiment.Output from transducer 1 to 4 is imported in selector 9 and the definite device 5 to 8.Determine that device can determine from all outputs of transducer whether all for just, and it can definite result output to selector 9.Based on the definite result who determines device 5 to 8, selector 9 can be exported the result that all values is positive combination.In the output of selector 9, the value of two kinds of primary colors is input in the synthesizer 11 in the four primaries, and the value of blend color A is input in the distributor 10.Distributor 10 can be carried out first embodiment's the calculating of " mathematic(al) representation 10 ", and the result can be outputed to synthesizer 11.Synthesizer 11 can be carried out first embodiment's the calculating of " mathematic(al) representation 11 ", and the result can be outputed to the processor 12 that overflows.If there is the output valve of synthesizer 11 to surpass peak, the processor 12 that then overflows can be carried out the processing of the 3rd embodiment, and the signal of exportable four primaries.If do not surpass the output valve of peak, the processor 12 that then overflows can in statu quo be exported the output valve of synthesizer 11.

＜the six embodiment 〉

Fig. 2 shows by hardware and realizes other examples of the present invention.In the figure, Reference numeral 13 to 16 is represented transducers, is used for trichromatic input signal is converted to the trichromatic value of four primaries; Device is determined in Reference numeral 17 to 20 expression, be used for determining from all outputs of transducer 13 to 16 whether all for just, and if all export all to just the output valve of output translator then; Reference numeral 21 expression synthesizers are used for the output result that weighted sum is on average determined device; And Reference numeral 22 represents to overflow processor, is used for carrying out and handles, and makes that peak becomes 1 when comprising the value that is not less than peak among the output result of synthesizer 22.

In the present embodiment, meet second embodiment up to the processing of synthesizer 21, and the processing of the processor 22 that overflows meets the 3rd embodiment.

Originally, the signal of X, Y and Z is input to transducer 13 to 16 respectively.In transducer 13 to 16, carry out calculating according to " mathematic(al) representation 12 " to " mathematic(al) representation 15 " of second embodiment, and the output tricolor signal.Output from transducer 13 to 16 is input to definite device 17 to 20.Determine that device can determine from all output results of this transducer whether all for just.Then, when all the output results from this transducer are timing, determine the device output result of output translator in statu quo, when comprising any negative value among the output result of transducer, it does not export the result.Synthesizer 21 can use second embodiment's " mathematic(al) representation 16 " synthetic output result from judgment means 17 to 20, and it can be exported.If when having the output valve of synthesizer 21 to surpass peak, the processor 22 that then overflows can be carried out the processing of the 3rd embodiment, and exportable four primaries signal.If there is not output valve to surpass peak, the processor 22 that then overflows can in statu quo be exported the output valve of synthesizer 21.

＜the seven embodiment 〉

Fig. 3 shows by hardware and realizes other examples of the present invention.In this accompanying drawing, Reference numeral 23 to 30 is represented transducers, is used for trichromatic input signal is converted to the trichromatic value of four primaries; Device is determined in Reference numeral 31 to 38 expression, be used for determining from all outputs of transducer 23 to 30 whether all for just, and if all export all to just the output valve of output translator then; Reference numeral 39 expression synthesizers are used for the output result that weighted sum is on average determined device.

The operation of present embodiment is identical with the 4th embodiment.

At first, the signal of X, Y and Z is input to transducer 23 to 30 respectively.In transducer 23 to 30, carry out calculating according to " mathematic(al) representation 29 " to " mathematic(al) representation 36 " of the 4th embodiment, and the output tricolor signal.Output from transducer 23 to 30 is imported in the judgment means 31 to 38.Whether judgment means can be judged from all output results of transducer all for just.Then, when from this transducer all output results all be timing, judgment means is the output result of output translator in statu quo, and when comprising any negative value among the output result of judgment means, it does not export the result.Synthesizer 39 can use the 4th embodiment's " mathematic(al) representation 37 " synthetic output result from judgment means 31 to 38, and it can be exported.

In embodiment 1 to 7, use CIE 1931 color coordinatess system to be as color coordinates; Yet, also can use other color coordinates system.

In addition, in embodiment 5 to 7, use X, Y and Z as the color signal that will import; Yet, can use the color signal that comes other color coordinates system of designated color by three signals such as R, G and B.For example, also can directly change R, G and B signal, and after R, G and B conversion of signals are X, Y and Z signal, carry out conversion according to above-mentioned each embodiment.

In addition, in embodiment 5 to 7, show the example of hardware configuration; Yet as long as can implement the present invention, hardware configuration is not limited to these embodiment.

Further, can use such as L ^*a ^*b ^*Other color space that the space is such.

In addition, as the color of the sub-pixel of display, preferably can adopt the structure of using red sub-pixel, blue subpixels, green sub-pixels and cyan sub-pixel; Yet the color of sub-pixel is not limited to this embodiment.If display is a self-emitting display, then can come any chooser color of pixel by the material of selecting luminous element.In addition, if display is configured to select concrete wavelength from output from the light of light source by filter,, then can set the color of sub-pixel arbitrarily by the optical characteristics of setting filter as LCD.For example, using under the situation of red sub-pixel, needn't make the colourity of redness of sub-pixel identical with the red color that NTSC defines.This also is applicable to other color of sub-pixel.

According to present embodiment, owing to use two kinds of primary colors having mixed in the four primaries and a mixed signal and three kinds of colors of four primaries that tristimulus values are converted to three kinds of colors by (1), so that convert blend color to four kinds of colors; The perhaps average a plurality of three primary colors combinations of (2) weighted sum can be lighted all four primaries except that profile farthest, therefore can improve picture quality, and prevent the vision interference.In addition, can realize a kind of signal processing method,, can improve processing speed by not using the straightforward procedure of cutting apart (division) by this signal processing method.

Claims (16)

1. signal processing method, this method comprises the steps:

Three signals of a color of pixel of input regulation; And

Generate four signals from three signals of input, each signal indication in wherein said four signals is used for showing by colour mixture the intensity of four kinds of corresponding a kind of colors of different colours of a color of pixel,

Wherein said generation step comprises:

First switch process, three conversion of signals of input are become two signals of the intensity of two kinds of colors in four kinds of colors of expression, and the signal of intensity of expression blend color, wherein this blend color be by mix (a) these four kinds of colors or (b) the multiple color in these four kinds of colors obtain; And

Second switch process is a plurality of signals with the conversion of signals of representing the intensity of blend color, and these a plurality of signal indications comprise the intensity of the multiple color of other the two kind colors different with these two kinds of colors at least.

2. signal processing method as claimed in claim 1,

Wherein said blend color is a kind of like this color, and it obtains by mixing described other two kinds of colors at least.

3. signal processing method as claimed in claim 1 or 2,

Wherein said blend color is a kind of like this color, and it is to obtain by the multiple color of mixing with the predetermined mix ratio in described four kinds of colors or the described four kinds of colors; And

In described second switch process, represent that the signal of the intensity of described blend color is converted into the signal of representing the intensity of described four kinds of colors or described multiple color according to described blending ratio.

4. signal processing method as claimed in claim 1 or 2,

Wherein said blend color is by one of mixing in described two kinds of colors at least and described other two kinds of colors that color obtains;

The signal of the intensity of a kind of color in the described two kinds of colors in the described multiple color that described method also comprises the steps: to be obtained in described second switch process of synthetic expression, and the signal of the intensity of the described a kind of color in described two kinds of colors of representing to be obtained in described first switch process.

5. signal processing method as claimed in claim 1 or 2,

Wherein in each combination of two kinds of different color combination, carry out described first switch process respectively, so that obtain to be used for the signal of every kind of combination; And

Based on the signal of the intensity of the described two kinds of colors of the expression of described first switch process and represent that all values of signal of the intensity of described blend color is positive result all, carry out described second switch process.

6. signal processing method as claimed in claim 1, this method comprises:

Replacement step is used for the difference between described value and the described peak being replaced with the signal of the intensity of other three kinds of colors of expression when any value of four signals of described generation surpasses the peak that sets.

7. color signal processing method, this method comprises the steps:

Three signals of a color of pixel of input regulation; And

Generate four signals from three signals of described input, each signal indication in wherein said four signals is used for showing by colour mixture the intensity of four kinds of corresponding a kind of colors of different colours of a color of pixel,

Wherein said generation step comprises:

First switch process is used for three signals with the intensity of three kinds of colors among three described four kinds of colors of conversion of signals one-tenth expression of described input;

Second switch process is used for three signals of intensity that three conversion of signals with described input become three kinds of colors of the expression combination different with described three kinds of color combinations; And

The signal of the intensity of the same color in three signals that obtain in the synthesis step, the signal that is used for three signals that described first switch process is obtained and described second switch process of expression synthesizes.

8. color signal processing method as claimed in claim 7, this method comprises:

Replacement step is used for the difference between described value and the described peak being replaced with the signal of the intensity of other three kinds of colors of expression when any value of four signals of described generation surpasses the peak that sets.

9. color signal processing method as claimed in claim 7,

Wherein said synthesis step composite signal is so that meet the following conditions

(u '-u ' 1) * 2+ (v '-v ' 1) * 2} * (1/2)≤0.015, and

{(u′-u′2)×2+(v′-v′2)×2)×(1/2)≤0.015，

Wherein, the colourity of the u ' v ' by using the pixel that three signals obtaining in described first switch process show is (u ' 1, v ' 1); The colourity of u ' v ' by using the pixel that three signals obtaining in described second switch process show is (u ' 2, v ' 2); And the colourity of the u ' v ' by using the pixel that four signals obtaining as synthetic result show is (u ', v ').

10. color signal processing method, this method comprises the steps:

Three signals of a color of pixel of input regulation; And

Generate four signals from three signals of described input, each signal indication in wherein said four signals is used for showing by colour mixture the intensity of four kinds of corresponding a kind of colors of different colours of a color of pixel,

Wherein said generation step comprises:

First switch process, be used for three or four signals of intensity that three conversion of signals with described input become three kinds or four kinds colors of first kind of combination of eight kinds of combinations of expression, these eight kinds of combinations comprise: (i) get four kinds of combinations of three kinds of colors from described four kinds of colors, and (ii) make the value of any color in described four kinds of colors be fixed as four kinds of combinations of peak;

Second switch process is used for three or four signals of intensity that three conversion of signals with described input become three kinds or four kinds colors of second kind of combination of expression, and wherein this second kind of combination is different with the described first kind of combination in described eight kinds of combinations; And

Synthesis step is used for the signal of the intensity of the same color in three of described second kind of combination of obtaining in signal and described second switch process of expression of three or four signals of described first kind of combination that synthetic described first switch process obtains or four signals.

11. color signal processing method as claimed in claim 10, this method comprises:

Replacement step is used for the difference between described value and the described peak being replaced with the signal of the intensity of other three kinds of colors of expression when any value of four signals of described generation surpasses the peak that sets.

12. a signal processing method is used for the point on the three-dimensional color space is converted to point on the four-dimensional color space of being made up of four base vectors, this method comprises:

First step is used for calculating the value that the coefficient of the point on the three-dimensional color space is represented in two base vectors being used for by described four base vectors and the linear combination of the primary vector of being represented by the linear combination of described four base vectors;

Second step is used for the value of the coefficient of the primary vector that calculates according to described first step, calculates the value of the coefficient of four base vectors; And

According to the value of the coefficient of four base vectors that obtain in the value of the coefficient of two base vectors that obtain in the described first step and described second step, calculate the step of value that is used for representing the coefficient of the point on the four-dimensional color space by the linear combination of four base vectors.

13. a signal processing method is used for the point on the three-dimensional color space is converted to point on the four-dimensional color space of being made up of four base vectors, this method comprises:

First step, calculating is used for representing by the linear combination of three base vectors of four base vectors the value of the coefficient of the point on the three-dimensional color space;

Second step is calculated the value that the coefficient of this point on the three-dimensional color space is represented in the linear combination be used for three base vectors by other combinations different with the combination of described three base vectors of described first step; And

Third step according to the value of the coefficient that calculates in the value of the coefficient that calculates in the first step and second step, calculates the value that is used for representing by the linear combination of four base vectors the coefficient of the point on the four-dimensional color space.

14. a signal processing method is used for the point on the three-dimensional color space is converted to point on the four-dimensional color space of being made up of four base vectors, this method comprises:

First step, calculating is used for representing by the linear combination of three base vectors of a kind of combination of selecting from eight kinds of combinations the value of the coefficient of the point on the three-dimensional color space, wherein these eight kinds of combinations comprise four kinds of combinations of getting three base vectors from described four base vectors, and make the value of the coefficient of any one base vector in described four kinds of base vectors be fixed as four kinds of combinations of peak;

Second step is calculated and to be used for by representing the value of the coefficient of this point on the three-dimensional color space with described a kind of linear combination of making up three base vectors of other different combinations; And

Third step according to the value of the coefficient that calculates in the value of the coefficient that calculates in the first step and second step, calculates the value that is used for representing by the linear combination of four base vectors the coefficient of the point on the four-dimensional color space.

15. an image display, this image display comprises:

Data converting circuit is used for by using any one described color signal processing method of signal processing method according to claim 1 or claim 7 and 10, is described four signals with three conversion of signals to be imported;

Drive circuit is used for based on described four signal output drive signals; And

Display element, being used for basis will be from the drive signal display image of described drive circuit output.

16. a television equipment, this television equipment comprises:

Image display according to claim 15; And

Receiving circuit is used for by received television signal view data being offered described image display.

Images