CN104795052A - RGBW (Red, Green, Blue and White) signal conversion method and system - Google Patents

Abstract

The invention relates to the technical field of display and discloses an RGBW (Red, Green, Blue and White) signal conversion method. The RGBW signal conversion method comprises the following steps: judging a signal of an absent sub pixel X of a pixel on a display panel, wherein X represents one of R, G, B and W; calculating respective gray-scale values Rout, Gout, Bout and Wout in an output signal according to gray-scale values Rin, Gin and Bin in an input signal; resetting a gray-scale value Xout corresponding to the X and generating an output signal of which the gray-scale value Xout is zero, wherein the Xout represents one of the Rout, the Gout, the Bout and the Wout. The invention further discloses an RGBW signal conversion system. According to the RGBW signal conversion method and the RGBW signal conversion system disclosed by the invention, the number of sub pixels is not increased, and the conversion of RGBW signals for displaying the resolution ratio can also be kept.

Description

RGBW signal conversion method and system

Technical field

The present invention relates to display technique field, particularly a kind of RGBW signal conversion method and system.

Background technology

Along with current display panel resolution is more and more higher, PPI (Pixels Per Inch) is more and more higher, makes the transmitance of panel more and more lower, significantly increases the manufacturing cost of panel.So RGBW algorithm obtains applying more and more widely.

Traditional RGBW signal conversion method the rgb signal conversion RGBW data of input exports, and on display panel, the many W sub-pixs of each pixel, cause the sub-pix number of display panel to become original 4/3 times.Namely traditional RGBW method is that each pixel has four sub-pixs, be respectively R G B W, have the situation of three sub-pixs (R/G/B) relative to each pixel, to maintain same resolution, just need the number increasing sub-pix, panel size can become large; If on the panel of same size, resolution will reduce.

In another approach, optionally can delete some RGBW sub-pixels, although this kind of framework can avoid the problems referred to above, distortion during display can be brought, reduce display quality.

Summary of the invention

(1) technical matters that will solve

The technical problem to be solved in the present invention is: realize a kind of RGBW signal conversion method neither increasing sub-pix number and can keep again display resolution.

(2) technical scheme

For solving the problems of the technologies described above, the invention provides a kind of RGBW signal conversion method, comprising:

To the pixel of on display panel, judge the sub-pix X that lacks, X represent R, G, B and W one of them;

Press as shown in the formula (1) according to grey decision-making R respective in input signal _in, G _inand B _incalculate grey decision-making R respective in output signal _out, G _out, B _outand W _out:

$\left\{\begin{array}{c}{R}^{,}=\mathrm{\α}{R}_{\mathrm{in}},G^{,}=\mathrm{\α}{G}_{\mathrm{in}},B^{,}=\mathrm{\α}{B}_{\mathrm{in}}\\ W^{,}=\mathrm{Min}(R^{,},G^{,},B^{,})\\ W_{\mathrm{out}}=\mathrm{\β\λ}{W}^{,}\\ R_{\mathrm{out}}=\mathrm{\λ}(R^{,}-W^{,}),G_{\mathrm{out}}=\mathrm{\λ}(G^{,}-W^{,}),B_{\mathrm{out}}=\mathrm{\λ}(B^{,}-W^{,})\end{array}\right.---\left(1\right)$

Wherein, α is the scale amplifying factor, and λ is the luminance raising factor, and β is white light compensating factor, and Min is for getting minimum value function, and W ' is intermediate variable;

By X corresponding for described X _outgrey decision-making resets, and generates described X _outgrey decision-making is the output signal of 0, described X _outrepresent R _out, G _out, B _outand W _outone of them.

Wherein, R is calculated _out, G _out, B _outand W _outafterwards, described X _outgrey decision-making also comprises before resetting:

Judging X _outwhen grey decision-making is not 0, by the X of described pixel _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by predetermined allocation rule _out.

Wherein, described predetermined allocation rule is as shown in formula (2):

$\left\{\begin{array}{c}{X}_{\mathrm{out}1}=(2/3)X_{\mathrm{out}11}+(1/3)X_{\mathrm{out}}\\ X_{\mathrm{out}2}=(2/3)X_{\mathrm{out}22}+(1/3)X_{\mathrm{out}}\end{array}---\left(2\right)\right.$

Wherein, X _out11for distributing the output grey decision-making of the sub-pix X of front first neighbor, X _out1for distributing the output grey decision-making of the sub-pix X of rear first neighbor, X _out22for distributing the output grey decision-making of the sub-pix X of front second neighbor, X _out2for distributing the output grey decision-making of the sub-pix X of rear second neighbor.

Wherein, sub-pix shape is rectangle, described by the X of described pixel _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by described predetermined allocation rule _outspecifically comprise: if adjacent two pixels in described pixel left and right all comprise sub-pix X, then by the X of described pixel _outgrey decision-making distributes to the X of the sub-pix X with left and right in adjacent two pixels by described predetermined allocation rule _out, otherwise distribute to the X of the sub-pix X in neighbouring two pixels _out, wherein, left and right is adjacent is defined as the adjacent of direction, sub-pix minor face straight line place, is neighbouringly defined as the adjacent of direction, straight line place, sub-pix long limit.

Wherein, time the grey decision-making W ' of described intermediate variable is less than GTG threshold value M, α <1, in time inputting grey decision-making and be greater than M, α >1.

Wherein, described λ value is: 1< λ < (2 ⁿ-1)/Max (R '-W ', G '-W ', B '-W '), wherein Max is for getting max function, and described n is the bit depth representing color.

Wherein, the value of described β is: 1< β < (2 ⁿ-1)/λ W ', wherein, described n is the bit depth representing color.

Present invention also offers a kind of RGBW signal translating system, comprising:

Sub-pix judging unit, for the pixel of on display panel, judges the sub-pix X lacked, X represent R, G, B and W one of them;

Grey decision-making computing unit, for pressing as shown in the formula (1) according to grey decision-making R respective in input signal _in, G _inand B _incalculate grey decision-making R respective in output signal _out, G _out, B _outand W _out:

$\left\{\begin{array}{c}{R}^{,}=\mathrm{\&alpha;}{R}_{\mathrm{in}},G^{,}=\mathrm{\&alpha;}{G}_{\mathrm{in}},B^{,}=\mathrm{\&alpha;}{B}_{\mathrm{in}}\\ W^{,}=\mathrm{Min}(R^{,},G^{,},B^{,})\\ W_{\mathrm{out}}=\mathrm{\&beta;\&lambda;}{W}^{,}\\ R_{\mathrm{out}}=\mathrm{\&lambda;}(R^{,}-W^{,}),G_{\mathrm{out}}=\mathrm{\&lambda;}(G^{,}-W^{,}),B_{\mathrm{out}}=\mathrm{\&lambda;}(B^{,}-W^{,})\end{array}\right.---\left(1\right)$

Wherein, α is the scale amplifying factor, and λ is the luminance raising factor, and β is white light compensating factor, and Min is for getting minimum value function, and W ' is intermediate variable;

Output signal generation unit, for by X corresponding for described X _outgrey decision-making resets, and generates and does not comprise described X _outthe output signal of grey decision-making, described X _outrepresent R _out, G _out, B _outand W _outone of them.

Wherein, also comprise:

Grey decision-making allocation units, for judging X _outby the X of described pixel when grey decision-making is not 0 _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by predetermined allocation rule _out.

Wherein, described predetermined allocation rule is as shown in formula (2):

$\left\{\begin{array}{c}{X}_{\mathrm{out}1}=(2/3)X_{\mathrm{out}11}+(1/3)X_{\mathrm{out}}\\ X_{\mathrm{out}2}=(2/3)X_{\mathrm{out}22}+(1/3)X_{\mathrm{out}}\end{array}---\left(2\right)\right.$

Wherein, X _out11for distributing the output grey decision-making of the sub-pix X of front first neighbor, X _out1for distributing the output grey decision-making of the sub-pix X of rear first neighbor, X _out22for distributing the output grey decision-making of the sub-pix X of front second neighbor, X _out2for distributing the output grey decision-making of the sub-pix X of rear second neighbor.

Wherein, sub-pix shape is rectangle, if described grey decision-making allocation units all comprise sub-pix X, then by the X of described pixel specifically for two pixels that described pixel left and right is adjacent _outgrey decision-making distributes to the X of the sub-pix X with left and right in adjacent two pixels by described predetermined allocation rule _out, otherwise distribute to the X of the sub-pix X in neighbouring two pixels _out, wherein, left and right is adjacent is defined as the adjacent of direction, sub-pix minor face straight line place, is neighbouringly defined as the adjacent of direction, straight line place, sub-pix long limit.

Wherein, time the grey decision-making W ' of described intermediate variable is less than GTG threshold value M, α <1, in time inputting grey decision-making and be greater than M, α >1.

Wherein, described λ value is: 1< λ < (2 ⁿ-1)/Max (R '-W ', G '-W ', B '-W '), wherein Max is for getting max function, and described n is the bit depth representing color.

Wherein, the value of described β is: 1< β < (2 ⁿ-1)/λ W ', wherein, described n is the bit depth representing color.

(3) beneficial effect

The pixel comprising any three color sub-pixs of R, G, B and W that RGBW signal conversion method of the present invention and system are come on corresponding display panel by the rgb signal of input being converted to the signal comprising any three colors of R, G, B and W, thus achieve and neither increase sub-pix number the RGBW signal of display resolution can be kept again to change.

Accompanying drawing explanation

In Fig. 1, (a) is traditional RGB sub-pixel structure pel array schematic diagram, and (b) is the pel array schematic diagram comprising the RGBW wherein sub-pix of three colors;

Fig. 2 is a kind of RGBW signal conversion method process flow diagram of the embodiment of the present invention;

Fig. 3 is a kind of RGBW signal translating system structural representation of the embodiment of the present invention.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.

As shown in Figure 1, wherein (a) is traditional RGB sub-pixel structure pel array schematic diagram, b () is the pel array schematic diagram comprising the RGBW wherein sub-pix of three colors, as the first row pixel comprises pixel RGB, WRG, BWR and GBW respectively.B () this array structure had both included W sub-pix, do not reduce total number of pixels again, and resolution can not be affected.The invention provides a kind of signal rgb signal being converted to the display panel shown in (b) in adaptation Fig. 1.Therefore, RGBW signal conversion method of the present invention is the signal rgb signal of input being converted to WRG, BWR and GBW, and its idiographic flow as shown in Figure 2, comprising:

Step S210, to the pixel of on display panel, judges the signal of sub-pix X lacked, X represent R, G, B and W one of them.As converted GBW signal to, then X represents R.Which sub-pix can be comprised according to obtaining in the parameter of display panel itself current pixel during judgement, arranging relevant with scanning sequency and panel RGBW.That is in this panel of Fig. 1 (b), that the 4th (i-1)+1 Lieque for the first row is few is W, that the 4th (i-1)+2 Lieques are few is B, that the 4th (i-1)+3 Lieques are few is G, that the 4th (i-1)+4 Lieques are few is R, i=1,2,3 ...That the 4th (i-1)+1 Lieque for the second row is few is G, and that the 4th (i-1)+2 Lieques are few is R, and that the 4th (i-1)+3 Lieques are few is W, and that the 4th (i-1)+4 Lieques are few is B.Two row one-periods, circulate to the last a line successively.

Step S220, presses as shown in the formula (1) according to grey decision-making R respective in input signal _in, G _inand B _incalculate grey decision-making R respective in output signal _out, G _out, B _outand W _out:

$\left\{\begin{array}{c}{R}^{,}=\mathrm{\&alpha;}{R}_{\mathrm{in}},G^{,}=\mathrm{\&alpha;}{G}_{\mathrm{in}},B^{,}=\mathrm{\&alpha;}{B}_{\mathrm{in}}\\ W^{,}=\mathrm{Min}(R^{,},G^{,},B^{,})\\ W_{\mathrm{out}}=\mathrm{\&beta;\&lambda;}{W}^{,}\\ R_{\mathrm{out}}=\mathrm{\&lambda;}(R^{,}-W^{,}),G_{\mathrm{out}}=\mathrm{\&lambda;}(G^{,}-W^{,}),B_{\mathrm{out}}=\mathrm{\&lambda;}(B^{,}-W^{,})\end{array}\right.---\left(1\right)$

Wherein, α is the scale amplifying factor, and λ is the luminance raising factor, and β is white light compensating factor, and Min is for getting minimum value function, and W ' is intermediate variable.

Step S230, by X corresponding for described X _outgrey decision-making resets, and generates X _outgrey decision-making is the output signal of 0, described X _outrepresent R _out, G _out, B _outand W _outone of them.As converted GBW signal to, if the grey decision-making R of R in the rgb signal of input _inminimum, then by formula (1) known R _outbe 0, just by G _out, B _outand W _outgenerate GBW signal.

The pixel (as: WRG, BWR and GBW) comprising any three color sub-pixs of R, G, B and W that RGBW signal conversion method of the present invention comes on corresponding display panel by the rgb signal of input being converted to the signal comprising any three colors of R, G, B and W, thus achieve and neither increase sub-pix number the RGBW signal of display resolution can be kept again to change.

After generating respective output GTG by formula (1), X _outgrey decision-making may not be 0, as converted GBW signal to, but the final R calculated _outbe not 0, can be understood as this pixel needs the comparison of ingredients of the red color of display large, and the pixel of GBW does not have corresponding R sub-pix, if now by R _outreset, then display color can be affected.Therefore, further, R is being calculated _out, G _out, B _outand W _outafterwards, X _outalso comprise before clearing: judging X _outby the X of described pixel when grey decision-making is not 0 _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by predetermined allocation rule _out.Namely by suitably increasing the X Show Color with X sub-pix around, to reduce the impact on display color.

In the present embodiment, predetermined allocation rule comprises: as shown in formula (2):

$\left\{\begin{array}{c}{X}_{\mathrm{out}1}=(2/3)X_{\mathrm{out}11}+(1/3)X_{\mathrm{out}}\\ X_{\mathrm{out}2}=(2/3)X_{\mathrm{out}22}+(1/3)X_{\mathrm{out}}\end{array}---\left(2\right)\right.$

Wherein, X _out11for distributing the output grey decision-making of the sub-pix X of front first neighbor, X _out1for distributing the output grey decision-making of the sub-pix X of rear first neighbor, X _out22for distributing the output grey decision-making of the sub-pix X of front second neighbor, X _out2for distributing the output grey decision-making of the sub-pix X of rear second neighbor.

Further, described by the X of described pixel _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by predetermined allocation rule _outspecifically comprise: if adjacent two pixels in described pixel left and right all comprise sub-pix X, then by the X of described pixel _outgrey decision-making distributes to the X of the sub-pix X with left and right in adjacent two pixels by predetermined allocation rule _out, otherwise distribute to the X of the sub-pix X in neighbouring two pixels _out, wherein, left and right is adjacent is defined as the adjacent of direction, sub-pix minor face straight line place, is neighbouringly defined as the adjacent of direction, straight line place, sub-pix long limit.Sub-pix is rectangle, short side direction human eye is not easy to the borrow of identification colors.

Wherein, time the grey decision-making W ' of described intermediate variable is less than GTG threshold value M, α=A, in time inputting grey decision-making and be greater than M, α=B, A<1, B>1.M can be predetermined to be 50, namely 50 GTGs, and the value of M, A and B all can by the adjustment of actual panel situation, and object is to adjust contrast, reduces low gray-scale intensity, improves high gray brightness.

Wherein, described λ value is: 1< λ < (2 ⁿ-1)/Max (R '-W ', G '-W ', B '-W '), wherein Max is for getting max function, and described n is the bit depth representing color.

Wherein, the value of described β is: 1< β < (2 ⁿ-1)/λ W ', wherein, described n is the bit depth representing color.

If above-mentioned RGB turns in the example of GBW, be B in its input signal _inminimum, by formula (1), B _outbe then 0, now, can by above-mentioned allocation rule: X _out1=(2/3) X _out11+ (1/3) X _out, X _out2=(2/3) X _out22+ (1/3) X _out, from the B of neighbor _outobtain the B of this pixel _out.

For the rgb pixel in display panel, also can change by the mode of the embodiment of the present invention, by the W changed out the rgb signal of input _outreset.Also can by above-mentioned allocation rule by W before certain clearing _outdistribute to the W of neighbor _out.

Present invention also offers a kind of RGBW signal translating system, as indicated at 3, comprising:

Sub-pix judging unit 310, for the pixel of on display panel, judges the signal of the sub-pix X lacked, X represent R, G, B and W one of them.

Grey decision-making computing unit 330, for pressing as shown in the formula (1) according to grey decision-making R respective in input signal _in, G _inand B _incalculate grey decision-making R respective in output signal _out, G _out, B _outand W _out:

$\left\{\begin{array}{c}{R}^{,}=\mathrm{\&alpha;}{R}_{\mathrm{in}},G^{,}=\mathrm{\&alpha;}{G}_{\mathrm{in}},B^{,}=\mathrm{\&alpha;}{B}_{\mathrm{in}}\\ W^{,}=\mathrm{Min}(R^{,},G^{,},B^{,})\\ W_{\mathrm{out}}=\mathrm{\&beta;\&lambda;}{W}^{,}\\ R_{\mathrm{out}}=\mathrm{\&lambda;}(R^{,}-W^{,}),G_{\mathrm{out}}=\mathrm{\&lambda;}(G^{,}-W^{,}),B_{\mathrm{out}}=\mathrm{\&lambda;}(B^{,}-W^{,})\end{array}\right.---\left(1\right)$

Wherein, α is the scale amplifying factor, and λ is the luminance raising factor, and β is white light compensating factor, and Min is function of minimizing, and W ' is intermediate variable.

Output signal generation unit 330, for by X corresponding for described X _outgrey decision-making resets, and generates described X _outgrey decision-making is the output signal of 0, described X _outrepresent R _out, G _out, B _outand W _outone of them.

Further, described system also comprises:

Grey decision-making allocation units 340, for judging X _outby the X of described pixel when grey decision-making is not 0 _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by pre-defined rule _out.

Wherein, described predetermined allocation rule comprises: as shown in formula (2):

$\left\{\begin{array}{c}{X}_{\mathrm{out}1}=(2/3)X_{\mathrm{out}11}+(1/3)X_{\mathrm{out}}\\ X_{\mathrm{out}2}=(2/3)X_{\mathrm{out}22}+(1/3)X_{\mathrm{out}}\end{array}---\left(2\right)\right.,$

Wherein, X _out11for distributing the output grey decision-making of the sub-pix X of front first neighbor, X _out1for distributing the output grey decision-making of the sub-pix X of rear first neighbor, X _out22for distributing the output grey decision-making of the sub-pix X of front second neighbor, X _out2for distributing the output grey decision-making of the sub-pix X of rear second neighbor.

Wherein, if described grey decision-making allocation units all comprise sub-pix X, then by the X of described pixel specifically for two pixels that described pixel left and right is adjacent _outgrey decision-making distributes to the X of the sub-pix X with left and right in adjacent two pixels by predetermined allocation rule _out, otherwise distribute to the X of the sub-pix X in neighbouring two pixels _out, wherein, left and right is adjacent is defined as the adjacent of direction, sub-pix minor face straight line place, is neighbouringly defined as the adjacent of direction, straight line place, sub-pix long limit.

Wherein, time the grey decision-making W ' of described intermediate variable is less than M, α <1, in time inputting GTG and be greater than M, α >1.

Wherein, described λ value is: 1< λ < (2 ⁿ-1)/Max (R '-W ', G '-W ', B '-W '), wherein Max is for getting max function, and described n is the bit depth representing color.

Wherein, the value of described β is: 1< β < (2 ⁿ-1)/λ W ', wherein, described n is the bit depth representing color.

Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (14)

1. a RGBW signal conversion method, is characterized in that, comprising:

To the pixel of on display panel, judge the sub-pix X that lacks, X represent R, G, B and W one of them;

Press as shown in the formula (1) according to grey decision-making R respective in input signal _in, G _inand B _incalculate grey decision-making R respective in output signal _out, G _out, B _outand W _out:

$\left\{\begin{array}{c}{R}^{,}={\mathrm{\&alpha;R}}_{\mathrm{in}},G^{,}={\mathrm{\&alpha;G}}_{\mathrm{in}},B^{,}={\mathrm{\&alpha;B}}_{\mathrm{in}}\\ W^{,}=\mathrm{Min}(R^{,},G^{,},B^{,})\\ W_{\mathrm{out}}={\mathrm{\&beta;\&lambda;W}}^{,}\\ R_{\mathrm{out}}=\mathrm{\&lambda;}(R^{,}-W^{,}),G_{\mathrm{out}}=\mathrm{\&lambda;}(G^{,}-W^{,}),B_{\mathrm{out}}=\mathrm{\&lambda;}(B^{,}-W^{,})\end{array}\right.---\left(1\right)$

Wherein, α is the scale amplifying factor, and λ is the luminance raising factor, and β is white light compensating factor, and Min is minimum value function, and W ' is intermediate variable;

By X corresponding for described X _outgrey decision-making resets, and generates described X _outgrey decision-making is the output signal of 0, described X _outrepresent R _out, G _out, B _outand W _outone of them.

2. RGBW signal conversion method as claimed in claim 1, is characterized in that, calculate R _out, G _out, B _outand W _outafterwards, described X _outgrey decision-making also comprises before resetting:

Judging X _outwhen grey decision-making is not 0, by the X of described pixel _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by predetermined allocation rule _out.

3. RGBW signal conversion method as claimed in claim 2, it is characterized in that, described predetermined allocation rule is as shown in formula (2):

$\left\{\begin{array}{c}{X}_{\mathrm{out}1}=(2/3)X_{\mathrm{out}11}+(1/3)X_{\mathrm{out}}\\ X_{\mathrm{out}2}=(2/3)X_{\mathrm{out}22}+(1/3)X_{\mathrm{out}}\end{array}\right.---\left(2\right)$

Wherein, X _out11for distributing the output grey decision-making of the sub-pix X of front first neighbor, X _out1for distributing the output grey decision-making of the sub-pix X of rear first neighbor, X _out22for distributing the output grey decision-making of the sub-pix X of front second neighbor, X _out2for distributing the output grey decision-making of the sub-pix X of rear second neighbor.

4. RGBW signal conversion method as claimed in claim 2, it is characterized in that, sub-pix shape is rectangle, described by the X of described pixel _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by described predetermined allocation rule _outspecifically comprise: if adjacent two pixels in described pixel left and right all comprise sub-pix X, then by the X of described pixel _outgrey decision-making distributes to the X of the sub-pix X with left and right in adjacent two pixels by described predetermined allocation rule _out, otherwise distribute to the X of the sub-pix X in neighbouring two pixels _out, wherein, left and right is adjacent is defined as the adjacent of direction, sub-pix minor face straight line place, is neighbouringly defined as the adjacent of direction, straight line place, sub-pix long limit.

5. the RGBW signal conversion method according to any one of Claims 1 to 4, it is characterized in that, time the grey decision-making W ' of described intermediate variable is less than GTG threshold value M, α <1, in time inputting grey decision-making and be greater than M, α >1.

6. the RGBW signal conversion method according to any one of Claims 1 to 4, is characterized in that, described λ value is: 1< λ < (2 ⁿ-1)/Max (R '-W ', G '-W ', B '-W '), wherein Max is for getting max function, and described n is the bit depth representing color.

7. the RGBW signal conversion method according to any one of Claims 1 to 4, is characterized in that, the value of described β is: 1< β < (2 ⁿ-1)/λ W ', wherein, described n is the bit depth representing color.

8. a RGBW signal translating system, is characterized in that, comprising:

Sub-pix judging unit, for the pixel of on display panel, judges the sub-pix X lacked, X represent R, G, B and W one of them;

Grey decision-making computing unit, for pressing as shown in the formula (1) according to grey decision-making R respective in input signal _in, G _inand B _incalculate grey decision-making R respective in output signal _out, G _out, B _outand W _out:

$\left\{\begin{array}{c}{R}^{,}={\mathrm{\&alpha;R}}_{\mathrm{in}},G^{,}={\mathrm{\&alpha;G}}_{\mathrm{in}},B^{,}={\mathrm{\&alpha;B}}_{\mathrm{in}}\\ W^{,}=\mathrm{Min}(R^{,},G^{,},B^{,})\\ W_{\mathrm{out}}={\mathrm{\&beta;\&lambda;W}}^{,}\\ R_{\mathrm{out}}=\mathrm{\&lambda;}(R^{,}-W^{,}),G_{\mathrm{out}}=\mathrm{\&lambda;}(G^{,}-W^{,}),B_{\mathrm{out}}=\mathrm{\&lambda;}(B^{,}-W^{,})\end{array}\right.---\left(1\right)$

Wherein, α is the scale amplifying factor, and λ is the luminance raising factor, and β is white light compensating factor, and Min is for getting minimum value function, and W ' is intermediate variable;

Output signal generation unit, for by X corresponding for described X _outgrey decision-making resets, and generates and does not comprise described X _outthe output signal of grey decision-making, described X _outrepresent R _out, G _out, B _outand W _outone of them.

9. RGBW signal translating system as claimed in claim 8, is characterized in that, also comprise:

Grey decision-making allocation units, for judging X _outby the X of described pixel when grey decision-making is not 0 _outgrey decision-making distributes to the X of the sub-pix X in two pixels adjacent with described pixel by predetermined allocation rule _out.

10. RGBW signal translating system as claimed in claim 9, it is characterized in that, described predetermined allocation rule is as shown in formula (2):

$\left\{\begin{array}{c}{X}_{\mathrm{out}1}=(2/3)X_{\mathrm{out}11}+(1/3)X_{\mathrm{out}}\\ X_{\mathrm{out}2}=(2/3)X_{\mathrm{out}22}+(1/3)X_{\mathrm{out}}\end{array}\right.---\left(2\right)$

Wherein, X _out11for distributing the output grey decision-making of the sub-pix X of front first neighbor, X _out1for distributing the output grey decision-making of the sub-pix X of rear first neighbor, X _out22for distributing the output grey decision-making of the sub-pix X of front second neighbor, X _out2for distributing the output grey decision-making of the sub-pix X of rear second neighbor.

11. RGBW signal translating systems as claimed in claim 9, it is characterized in that, sub-pix shape is rectangle, if described grey decision-making allocation units all comprise sub-pix X, then by the X of described pixel specifically for two pixels that described pixel left and right is adjacent _outgrey decision-making distributes to the X of the sub-pix X with left and right in adjacent two pixels by described predetermined allocation rule _out, otherwise distribute to the X of the sub-pix X in neighbouring two pixels _out, wherein, left and right is adjacent is defined as the adjacent of direction, sub-pix minor face straight line place, is neighbouringly defined as the adjacent of direction, straight line place, sub-pix long limit.

12. RGBW signal translating systems according to any one of claim 8 ~ 11, it is characterized in that, time the grey decision-making W ' of described intermediate variable is less than GTG threshold value M, α <1, in time inputting grey decision-making and be greater than M, α >1.

13. RGBW signal translating systems according to any one of claim 8 ~ 11, it is characterized in that, described λ value is: 1< λ < (2 ⁿ-1)/Max (R '-W ', G '-W ', B '-W '), wherein Max is for getting max function, and described n is the bit depth representing color.

14. RGBW signal translating systems according to any one of claim 8 ~ 11, it is characterized in that, the value of described β is: 1< β < (2 ⁿ-1)/λ W ', wherein, described n is the bit depth representing color.