CN101895770B - Uniformity correcting method for separating brightness and chromaticity of LED display screen - Google Patents

Abstract

The invention relates to a uniformity correcting method for separating brightness and chromaticity of an LED display screen, which comprises the following steps of: detecting the chromaticity parameter of any pixel in each module in the LED display screen as a chromaticity coordinate of the module of the pixel; collecting brightness parameters of all display pixels; determining reference chromaticity coordinates and reference brightness of each reference color of the display screen; separating the parameters of the brightness and the chromaticity; forming a brightness correcting coefficient table aiming at any pixel in each module; forming a module chromaticity space transformation parameter matrix for any one module; obtaining corrected real-time driving display data by using the brightness correcting coefficient table and the module chromaticity space transformation parameter matrix; and driving the display screen by the real-time driving display data. By the method, the uniformity correcting problem of the chromaticity of the LED display screen is effectively solved, and the collecting efficiency of the chromaticity parameters is high.

Description

The LED display uniformity correcting method for separating brightness and chromaticity

Technical field

The invention belongs to the dull and stereotyped video display technology of light-emitting diode field, relate to and a kind of flat-panel monitor image displaying quality, display color and the uniformity are carried out to improved LED display uniformity correcting method for separating brightness and chromaticity.

Background technology

For the LED panel display screen, its luminescent panel by several ten thousand, even up to a million groups independently colour light-emitting diode (being designated hereinafter simply as the LED pipe) or the LED display module formed by the LED pipe form.Because self physical characteristic that is subject to the LED semiconductor device and production technology thereof etc. affect, cause in the LED display module and there is inconsistency in intermodule, make brightness and the Colour inequality of LED panel display screen.

Showing as each display module of screen (minimum can arrive display pixel) is different at the distributing position of chrominance space, the brightness showed when showing identical demonstration data and color are also fully different, can cause the color data of same color can produce the colourity disperse on display, and different color data can show same color (probability is less) on display sometimes, most situation is misalignment.Certainly, if just to LED display, take the screen intensity unification to proofread and correct, after proofreading and correct, still can present certain colour inhomogeneous.

(the patent No. 03127037.9 that the Chinese patent communique discloses a kind of " a kind of panel display screen chroma space modification method "; Hereinafter to be referred as patent 03127037.9), the method is according to the correlation theory of colorimetry, propose a kind of panel display screen chroma space modification method, it utilizes chroma space to complete primary colours explicit function characteristic is color space convert between color space convert and the diverse variety classes display screen of primary colours explicit function characteristic between nonlinear same class display screen; Introduce the benchmark colourity space criteria of supposition simultaneously, obtain respectively it to the corresponding conversion coefficient table of benchmark chrominance space for different display modules, corresponding display module (display pixel) is revised, set up unified benchmark chrominance space on display screen, overcome panel display screen colourity that the same panel display screen drives the difference of display characteristic to cause due to the chrominance space characteristic of each display module (display pixel) and primary colours and the problem of Luminance Distribution inequality, guaranteed the demonstration of high-quality video image.

In fact this chroma space correction is exactly a process of rationally utilizing " aberration " problem existed on the concept elimination display screen of " color tolerance ".According to the additive color process principle, to a certain proportion of other two kinds of primary colours of a certain mix of basic colors that has " aberration " problem, the secondary colour chromaticity coordinates is reached unanimity, its difference is controlled in " color tolerance " of human eye, thereby fundamentally solve LED display uniformity of chromaticity problem.

For the operation of actual display chroma space, more complicated, here for for simplicity, the primary colours explicit function characteristic of supposing the display screen that each need to carry out color space convert is all linear relationship, and linear coefficient is 1; Basic principle according to colorimetry, for some display systems, can mean the shades of colour that this display system can show according to primary colours X, the Y, the Z that meet human eye vision of colorimetry definition, these colors be integrated into X, Y, the certain subspace of Z volume exclusion, this sub-color space (abbreviation chrominance space) is expressed as:

$\left\{\begin{array}{c}X=X_{r}R+X_{g}G+X_{b}B\\ Y=Y_{r}R+Y_{g}G+Y_{b}B\\ Z=Z_{r}R+Z_{g}G+Z_{b}B\end{array}\right.---\left(1\right)$

Wherein, X _r, Y _rAnd Z _rMean to meet in primary colours R in this display system primary colours X, the Y of human eye vision, the component coefficient that Z occupies respectively; X _g, Y _gAnd Z _gMean to meet in primary colours G in this display system primary colours X, the Y of human eye vision, the component coefficient that Z occupies respectively; X _b, Y _bAnd Z _bMean to meet in primary colours B in this display system primary colours X, the Y of human eye vision, the component coefficient that Z occupies respectively; Main determining factor for chrominance space that a panel display screen more clearly is described can expand into (1) formula:

$\left\{\begin{array}{c}X=C_r{x}_{r}R+C_g{x}_{g}G+G_b{x}_{b}B\\ Y=C_r{y}_{r}R+C_g{y}_{g}G+C_b{y}_{b}B\\ Z=C_r{z}_{r}R+C_g{z}_{g}G+C_b{z}_{b}B\end{array}\right.---\left(2\right)$

C in formula _r, C _g, C _bMean the allocation of parameters between each primary colours, x _r, y _rAnd z _rThe chromaticity coordinate that means red primary, x _g, y _gAnd z _gThe chromaticity coordinate that means green primary, x _b, y _bAnd z _bThe chromaticity coordinate that means blue primary; From formula (2), can see, in a display system, if the colorimetric properties x of its primary colours _r, y _r, z _r, x _g, y _g, z _g, x _b, y _bAnd z _b, the allocation of parameters C between light characteristic (maximum of primary colours R, G, B) and primary colours _r, C _g, C _bOnce determine, its chrominance space has been determined with regard to unique so.

Illustrated in this patent document and made two different display systems there is the chroma conversion method of identical chrominance space.Its principle is mainly: when two display systems adopt same group to show data, R, G, B that their adopt are identical, due to the chromaticity coordinate x of each primary colours between them _r, y _r, z _r, x _g, y _g, z _g, x _b, y _bAnd z _bAll different, the allocation of parameters C between primary colours in addition _r, C _g, C _bAlso different, so be difficult to guarantee that color X, Y, the Z of current demonstration are identical; Under the effect of different demonstration data R, G, B, two shown color X, Y, Z of display system can not be consistent; The conversion method adopted in the method is using a display system as standard, the real-time operation that another display system is shown to the data aspect is processed, to guarantee this system in the situation that R, G, B on the same group not shows that the shades of colour of image can be consistent with the standard display system.

Detailed process is:

The chrominance space parameter of established standards display system is: x _Rref1, y _Rref1, z _Rref1, x _Gref1, y _Gref1, z _Gref1, x _Bref1, y _Bref1, z _Bref1, C _Rref1, C _Gref1, C _Bref1And the chrominance space parameter of another display system is: x _Rref2, y _Rref2, z _Rref2, x _Gref2, y _Gref2, z _Gref2, x _Bref2, y _Bref2, z _Bref2, C _Rref2, C _Gref2, C _Bref2The chrominance space of standard display system can be expressed as so:

$\left\{\begin{array}{c}X=C_{\mathrm{rref}1}{x}_{\mathrm{rref}1}{R}_{\mathrm{ref}1}+C_{\mathrm{gref}1}{x}_{\text{<figure-callout id="1" label="gref1 G ref" filenames="HSA00000179605500041.png,HSA00000179605500072.png" state="{{state}}">gref1</figure-callout>}}{G}_{\mathrm{ref}}{1}_{}+C_{\mathrm{bref}1}{x}_{\mathrm{bref}1}{B}_{\mathrm{ref}1}\\ Y=C_{\mathrm{rref}1}{y}_{\mathrm{rref}1}{R}_{\mathrm{ref}1}+C_{\mathrm{gref}1}{y}_{\mathrm{gref}1}{G}_{\mathrm{ref}1}+C_{\mathrm{bref}1}{y}_{\mathrm{bref}1}{B}_{\mathrm{ref}1}\\ Z=C_{\mathrm{rref}1}{z}_{\mathrm{rref}1}{R}_{\mathrm{ref}1}+C_{\mathrm{gref}1}{z}_{\mathrm{gref}1}{G}_{\mathrm{ref}1}+C_{\mathrm{bref}1}{z}_{\mathrm{bref}1}{B}_{\mathrm{ref}1}\end{array}\right.---\left(3\right)$

The chrominance space of another display system is:

$\left\{\begin{array}{c}X=C_{\mathrm{rref}2}{x}_{\mathrm{rref}2}{R}_{\mathrm{ref}2}+C_{\mathrm{gref}2}{x}_{\text{gref2}}{G}_{\mathrm{ref}2}+C_{\mathrm{bref}2}{x}_{\mathrm{bref}2}{B}_{\mathrm{ref}2}\\ Y=C_{\mathrm{rref}2}{y}_{\mathrm{rref}2}{R}_{\mathrm{ref}2}+C_{\mathrm{gref}2}{y}_{\mathrm{gref}2}{G}_{\mathrm{ref}2}+C_{\mathrm{bref}2}{y}_{\mathrm{bref}2}{B}_{\mathrm{ref}2}\\ Z=C_{\mathrm{rref}2}{z}_{\mathrm{rref}2}{R}_{\mathrm{ref}2}+C_{\mathrm{gref}2}{z}_{\mathrm{gref}2}{G}_{\mathrm{ref}2}+C_{\mathrm{bref}2}{z}_{\mathrm{bref}2}{B}_{\mathrm{ref}2}\end{array}\right.---\left(4\right)$

Obviously, the chrominance space of these two display systems only in the situation that identical being only of chrominance space parameter be equal to fully.And, under other condition, all there is aberration in two display screens when showing the color of appointment.

For the above-mentioned situation of better explanation, chrominance space parameter and demonstration data is separate, and (3) and (4) can be expressed as:

$\left[\begin{array}{c}{X}_1\\ Y_1\\ {\mathrm{<figure-callout\; id="1"\; label="Z"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">Z</figure-callout>}}_1\end{array}\right]=\left[\begin{array}{ccc}{C}_{\mathrm{rref}1}{x}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{x}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{x}_{\mathrm{bref}1}\\ C_{\mathrm{rref}1}{y}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{y}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{y}_{\mathrm{bref}1}\\ C_{\mathrm{rref}1}{z}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{z}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{z}_{\mathrm{bref}1}\end{array}\right]\left[\begin{array}{c}{R}_{\mathrm{ref}1}\\ G_{\mathrm{ref}1}\\ B_{\mathrm{ref}1}\end{array}\right]---\left(5\right)$

$\left[\begin{array}{c}{X}_2\\ Y_2\\ Z_2\end{array}\right]=\left[\begin{array}{ccc}{C}_{\mathrm{rref}2}{x}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{x}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{x}_{\mathrm{bref}2}\\ C_{\mathrm{rref}2}{y}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{y}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{y}_{\mathrm{bref}2}\\ C_{\mathrm{rref}2}{z}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{z}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{z}_{\mathrm{bref}2}\end{array}\right]\left[\begin{array}{c}{R}_{\mathrm{ref}2}\\ G_{\mathrm{ref}2}\\ B_{\mathrm{ref}2}\end{array}\right]---\left(6\right)$

For the 1st and the 2nd display system, substantially all consistent by the chrominance space parameter of each pixel in the inner, be respectively: x _Rref1, y _Rref1, z _Rref1, x _Gref1, y _Gref1, z _Gref1, x _Bref1, y _Bref1, z _Bref1, C _Rref1, C _Gref1, C _Bref1x _Rref2, y _Rref2, z _Rref2, x _Gref2, y _Gref2, z _Gref2, x _Bref2, y _Bref2, z _Bref2, C _Rref2, C _Gref2, C _Bref2When if two display systems are shown separately, no matter adopt anything to show data, because the chrominance space parameter of display system interior pixels is all consistent, the uniformity of image is guaranteed fully, under same demonstration data qualification, picture also be can't see notable difference; But, when two display systems being put together when will cause a larger display, problem has just produced.Herein, order

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="R\; ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">R</figure-callout>}}_{\mathrm{ref}}=R_{\mathrm{ref}2}=\mathrm{<figure-callout\; id="1"\; label="R\; G\; ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">R</figure-callout>}& \\ G_{\mathrm{ref}}{1}_{}=G_{\mathrm{ref}2}=\mathrm{<figure-callout\; id="1"\; label="G\; B\; ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">G</figure-callout>}& \\ B_{\mathrm{ref}}{1}_{}=B_{\mathrm{ref}2}=B\end{array}\right.---\left(7\right)$

(5) and (6) be

$\left[\begin{array}{c}{X}_1\\ Y_1\\ {\mathrm{<figure-callout\; id="1"\; label="Z"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">Z</figure-callout>}}_1\end{array}\right]=\left[\begin{array}{ccc}{C}_{\mathrm{rref}1}{x}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{x}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{x}_{\mathrm{bref}1}\\ C_{\mathrm{rref}1}{y}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{y}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{y}_{\mathrm{bref}1}\\ C_{\mathrm{rref}1}{z}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{z}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{z}_{\mathrm{bref}1}\end{array}\right]\left[\begin{array}{c}R\\ G\\ B\end{array}\right]---\left(8\right)$

$\left[\begin{array}{c}{X}_2\\ Y_2\\ Z_2\end{array}\right]=\left[\begin{array}{ccc}{C}_{\mathrm{rref}2}{x}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{x}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{x}_{\mathrm{bref}2}\\ C_{\mathrm{rref}2}{y}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{y}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{y}_{\mathrm{bref}2}\\ C_{\mathrm{rref}2}{z}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{z}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{z}_{\mathrm{bref}2}\end{array}\right]\left[\begin{array}{c}R\\ G\\ B\end{array}\right]---\left(9\right)$

Obviously, there is aberration in the color that these two display systems show, for picture quality, brings obvious impact.In order to address this problem, using the 1st display system as standard, the method for the demonstration data by the 2nd display system of real-time processing, keep two display system consistencies of colour.e.g.

$\left[\begin{array}{c}{X}_2\\ Y_2\\ Z_2\end{array}\right]=\left[\begin{array}{c}{X}_1\\ Y_1\\ Z_1\end{array}\right]---\left(10\right)$

So just have

$\left[\begin{array}{ccc}{C}_{\mathrm{rref}2}{x}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{x}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{x}_{\mathrm{bref}2}\\ C_{\mathrm{rref}2}{y}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{y}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{y}_{\mathrm{bref}2}\\ C_{\mathrm{rref}2}{z}_{\mathrm{rref}2}& C_{\mathrm{gref}2}{z}_{\mathrm{gref}2}& C_{\mathrm{bref}2}{z}_{\mathrm{bref}2}\end{array}\right]\left[\begin{array}{c}{R}_{\mathrm{ref}2}\\ G_{\mathrm{ref}2}\\ B_{\mathrm{ref}2}\end{array}\right]=\left[\begin{array}{ccc}{C}_{\mathrm{rref}1}{x}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{x}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{x}_{\mathrm{bref}1}\\ C_{\mathrm{rref}1}{y}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{y}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{y}_{\mathrm{bref}1}\\ C_{\mathrm{rref}1}{z}_{\mathrm{rref}1}& C_{\mathrm{gref}1}{z}_{\mathrm{gref}1}& C_{\mathrm{bref}1}{z}_{\mathrm{bref}1}\end{array}\right]\left[\begin{array}{c}R\\ G\\ B\end{array}\right]---\left(11\right)$

Abbreviation by (11), obtain

$\left[\begin{array}{c}{R}_{\mathrm{ref}2}\\ G_{\mathrm{ref}2}\\ B_{\mathrm{ref}2}\end{array}\right]=\left[\begin{array}{ccc}{C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{rr}}& {C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{rg}}& {C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{rb}}\\ {C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{gr}}& {C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{gg}}& {C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{gb}}\\ {C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{br}}& {C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{bg}}& {C_{\mathrm{ref}2-\mathrm{<figure-callout\; id="1"\; label="ref"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">ref</figure-callout>}1}}^{\mathrm{bb}}\end{array}\right]\left[\begin{array}{c}R\\ G\\ B\end{array}\right]---\left(12\right)$

In formula

Be the chromaticity space transformation parameter matrix of the 2nd display system to the 1st display system.

Shown color [the X corresponding to any demonstration data [RGB] of the 1st display system ₁Y ₁Z ₁], the 2nd the demonstration data [R that display system produces by real-time chromaticity space transformation parameter matrix _Ref2G _Ref2B _Ref2], guarantee to demonstrate with the 1st the same [X of display system color the 2nd display system ₁Y ₁Z ₁].

This patent document has provided the concrete explanation of the chroma conversion course of work and real time data processing schematic diagram.This patent is according to the principle of above-mentioned chroma conversion simultaneously, for the chrominance space characteristic of each display module of same panel display screen (display pixel) and the different situations of primary colours explicit function characteristic, determine the chrominance space parameter of a reference system, carry out again the real-time transform of the coefficient data of corresponding display module (display pixel), allow the color of whole display screen reach unanimity, improve the uniformity of panel display screen colourity and brightness.

When adopting the method to carry out the uniformity of chromaticity conversion to the LED panel display screen, the first problem faced is exactly the collecting efficiency problem, the LED luminescent panel by several ten thousand, even up to a million groups independently colour light-emitting diode (being designated hereinafter simply as the LED pipe) or the LED display module formed by the LED pipe form.Because self physical characteristic that is subject to the LED semiconductor device and production technology thereof etc. affect, cause in the LED display module and there is the inconsistency of different light tone degree in intermodule, make brightness and the Colour situation complexity of LED panel display screen.The concrete form of its distribution below is described.

(1) module distribution form.As shown in Figure 1, mean that the LED panel display screen chrominance space parameter differences distribution situation occurs with modular form;

Can see, the colourity difference of the LED panel display screen in figure occurs with modular form, and a total M * N module, be the 1_1 module in upper left module, and the module on its right side is the 1_2 module, and following module is the 2_1 module.Wherein any one module all comprises three kinds of primary colours, and the colorimetric parameter of each primary colours has [x, y, z, C], means respectively chromaticity coordinate and the allocation of parameters of this color; As the colorimetric parameter of red primary is [x _r, y _r, z _r, C _r]; The colorimetric parameter of green primary is [x _g, y _g, z _g, C _g]; The colorimetric parameter of blue primary is [x _b, y _b, z _b, C _b].

The colorimetric parameter of such display module is [x _r, y _r, z _r, x _g, y _g, z _g, x _b, y _b, z _b, C _r, C _g, C _b]; For upper left 1_1 module, its colorimetric parameter is [x _{R1_1}, y _{R1_1}, z _{R1_1}, x _{G1_1}, y _{G1_1}, z _{G1_1}, x _{B1_1}, y _{B1_1}, z _{B1_1}, C _{R1_1}, C _{G1_1}, C _{B1_1}]; For the 1_2 module, its colorimetric parameter is [x _{R1_2}, y _{R1_2}, z _{R1_2}, x _{G1_2}, y _{G1_2}, z _{G1_2}, x _{B1_2}, y _{B1_2}, z _{B1_2}, C _{R1_2}, C _{G1_2}, C _{B1_2}]; Can be expressed as the m_n module for any one module, its colorimetric parameter is [x _{Rm_n}, y _{Rm_n}, z _{Rm_n}, x _{Gm_n}, y _{Gm_n}, z _{Gm_n}, x _{Bm_n}, y _{Bm_n}, z _{Bm_n}, C _{Rm_n},, C _{Gm_n}, C _{Bm_n}].

If the colorimetric parameter of each display module is identical, the quantity of type of modules is 1 so; The colorimetric parameter of each display module is not identical, and the quantity of type of modules is M * N; The numerical value of type of modules 1 and M * N between.Although the quantity of module is quite a few, adopting traditional method of measurement is to complete above-mentioned surveying work.

(2) pixel distribution form.As shown in Figure 2, also not identical words between the pixel colorimetric parameter comprised in each display module, now mean that LED panel display screen chrominance space parameter differences has occurred with pixel form, also can be understood as each display module and only comprise a display pixel, the chrominance space parameter of each module is different, and the quantity of type of modules is the quantity that whole display screen comprises pixel to the maximum.Shown in accompanying drawing 2, mean that the LED panel display screen chrominance space parameter differences distribution situation occurs with pixel form;

Can see, the colourity difference of the LED panel display screen in figure occurs with pixel form, a total M * N module, and each module comprises I * J pixel (being 8 * 8 pixels in figure); In upper left module, be the 1_1 module, the module on its right side is the 1_2 module, and following module is the 2_1 module, and any one module can be expressed as the m_n module.In the 1_1 module, upper left pixel is the 1_1 pixel, and any one pixel is expressed as the i_j pixel; Pixel in each module is not always the case and distributes and mark.Each pixel comprises three kinds of primary colours, is expressed as respectively R _{[m, n] [i, j]}, G _{[m, n] [i, j]}, B _{[m, n] [i, j]}, wherein subscript [m, n] represents the module position of screen, and [i, j] means the position of this pixel in this module, same, and the colorimetric parameter of each primary colours in pixel is had to [x, y, z, C], means respectively chromaticity coordinate and the allocation of parameters of this color; Colorimetric parameter R as red primary _{[m, n] [i, j]}For [x _{R_[m, n] [i, j]}, y _{R_[m, n] [i, j]}, z _{R_[m, n]] i, j]}, C _{R_[m, n] [i, j]}]; The colorimetric parameter G of green primary _{[m, n] [i, j]}For [x _{G_[m, n] [i, j]}, y _{G_[m, n] [i, j]}, z _{G_[m, n] [i, j]}, C _{G_[m, n] [i, j]}]; The colorimetric parameter B of blue primary _{[m, n] [i, j]}For [x _{B_[m, n] [i, j]}, y _{B_[m, n] [i, j]}, z _{B_[m, n] [i, j]}, C _{B_[m, n] [i, j]}].

The colorimetric parameter of such display pixel is [x _{R_[m, n] [i, j]}, y _{R_[m, n] [i, j]}, z _{R_[m, n] [i, j]}, x _{G_[m, n] [i, j]}, y _{G_[m, n] [i, j]}, z _{G_[m, n] [i, j]}, x _{B_[m, n] [i, j]}, y _{B_[m, n] [i, j]}, z _{B_[m, n] [i, j]}, C _{R_[m, n] [i, j]}, C _{G_[m, n] [i, j]}, C _{B_[m, n] [i, j]}]; For the 1_1 pixel of upper left 1_1 module, its colorimetric parameter is [x _{R_[1,1] [1,1]}, y _{R_[1,1] [1,1]}, z _{R_[1,1] [1,1]}, x _{G_[1,1] [1,1]}, y _{G_[1,1] [1,1]}, z _{G_[1,1] [1,1]}, x _{B_[1,1] [1,1]}, y _{B_[1,1] [1,1]}, z _{B_[1,1] [1,1]}, C _{R_[1,1] [1,1]}, C _{G_[1,1] [1,1]}, C _{B_[1,1] [1,1]}]; For the 1_1 pixel of 1_2 module, its colorimetric parameter is [x _{R_[1,2] [1,1]}, y _{R_[1,2] [1,1]}, z _{R_[1,2] [1,1]}, x _{G_[1,2] [1,1]}, y _{G_[1,2] [1,1]}, z _{G_[1,2] [1,1]}, x _{B_[1,2] [1,1]}, y _{B_[1,2] [1,1]}, z _{B_[1,2] [1,1]}, C _{R_[1,2] [1,1]}, C _{G_[1,2] [1,1]}, C _{B_[1,2] [1,1]}]; For the i_j pixel of m_n module, its colorimetric parameter is [x _{R_[m, n] [i, j]}, y _{R_[m, n] [i, j]}, z _{R_[m, n] [i, j]}, x _{G_[m, n] [i, j]}, y _{G_[m, n] [i, j]}, z _{G_[m, n] [i, j]}, x _{B_[m, n] [i, j]}, y _{B_[m, n] [i, j]}, z _{B_[m, n] [i, j]}, C _{R_[m, n] [i, j]}, C _{G_[m, n] [i, j]}, C _{B_[m, n] [i, j]}].

If all pixel colorimetric parameters of each display module are identical, and the colorimetric parameter of each display module is identical, the quantity of pixel kind is 1 so; Pixel colorimetric parameter in each display module is not identical, and the quantity of type of modules is M * N * I * J; The numerical value of type of modules 1 and M * N * I * J between.Concerning the latter, the colorimetric parameter that adopts traditional method of measurement to obtain whole screen pixels is very difficult, there is no much realistic meanings.

While adopting the method to carry out the uniformity of chromaticity conversion to each display module of display screen (display pixel), basic step is

(1) determine flat panel display screen reference colours degree space according to each display module (display pixel) colorimetric parameter and primary colours explicit function property difference situation; (2) obtain the corresponding chromaticity space transformation parameter matrix of each display module (display pixel) to the benchmark chrominance space:

$\left[\begin{array}{ccc}{C_{\mathrm{rnd}-\min }}^{\mathrm{rr}}& {C_{\mathrm{rnd}-\min }}^{\mathrm{rg}}& {C_{\mathrm{rnd}-\min }}^{\mathrm{rb}}\\ {C_{\mathrm{rnd}-\min }}^{\mathrm{gr}}& {C_{\mathrm{rnd}-\min }}^{\mathrm{gg}}& {C_{\mathrm{rnd}-\min }}^{\mathrm{gb}}\\ {C_{\mathrm{rnd}-\min }}^{\mathrm{br}}& {C_{\mathrm{rnd}-\min }}^{\mathrm{bg}}& {C_{\mathrm{rnd}-\min }}^{\mathrm{bb}}\end{array}\right]---\left(13\right)$

(3) determine benchmark chrominance space primary colours explicit function characteristic and concrete display module primary colours drive characteristic;

(4) under controlling, control logic shows that data are by the primary colours explicit function converter of benchmark chrominance space, input concrete display module to the corresponding conversion coefficient of benchmark chrominance space simultaneously, then carry out computing by the color space convert array, the real time output data result allows the color of whole display screen reach unanimity.

According to above-mentioned requirements, at first each display module (display pixel) colorimetric parameter must be provided, if the colorimetric parameter of LED display is inconsistent by module distribution, than being easier to, operate comparatively speaking, according to pixels distribute and colorimetric parameter is inconsistent, substantially can't process by this patented method.It should be noted that, the method front illustrates, for for simplicity, each the primary colours explicit function characteristic that need to carry out the display screen of color space convert is all linear relationship, and linear coefficient is 1; Primary colours explicit function property difference situation is not done description here.

Therefore, need to be restudied the chrominance space conversion method, be obtained being suitable for the uniformity of chromaticity bearing calibration of LED display.

Summary of the invention

The technical problem that the present invention will solve is to provide the problem that a kind of uniformity of chromaticity correction aspect that can effectively solve LED display exists, and the high LED display uniformity correcting method for separating brightness and chromaticity of colorimetric parameter collecting efficiency.

In order to solve the problems of the technologies described above, LED display uniformity correcting method for separating brightness and chromaticity of the present invention comprises the steps:

1) each pixel colorimetric parameter in the set and display module all equates,, for the i_j pixel of m_n module wherein, has:

$\left\{\begin{array}{c}{x}_{r\_[m,n][i,j]}=x_{r\_[m,n]}\\ y_{r\_[m,n][i,j]}=y_{r\_[m,n]}\\ x_{g\_[m,n][i,j]}=x_{g\_[m,n]}\\ y_{g\_[m,n][i,j]}=y_{g\_[m,n]}\\ x_{b\_[m,n][i,j]}=x_{b\_[m,n]}\\ y_{b\_[m,n][i,j]}=y_{b\_[m,n]}\end{array}\right.---\left(14\right)$

Wherein m, n are respectively the capable ordinal sum row ordinal number of the display module at pixel place, and i, j are respectively the capable ordinal sum row ordinal number at pixel place in display module; Utilize light tone degree detector to obtain the colorimetric parameter x of arbitrary pixel in LED display m_n module _{R_[m, n] [i, j]}, y _{R_[m, n] [i, j]}, x _{G_[m, n] [i, j]}, y _{G_[m, n] [i, j]}, x _{B_[m, n] [i, j]}, y _{B_[m, n] [i, j]}Chromaticity coordinate x as the m_n module _{R_[m, n]}, y _{R_[m, n]}, x _{G_[m, n]}, y _{G_[m, n]}, x _{B_[m, n]}, y _{B_[m, n]}

Each display pixel on display screen is carried out to the brightness collection; Obtain the luminance parameter [B of each display pixel _{R_[m, n] [i, j]}, B _{G_[m, n] [i, j]}, B _{B_[m, n] [i, j]}];

2) determine the minimal color triangle coverage that on display screen, the chromaticity coordinate of all display pixels surrounds, the chromaticity coordinate [x on this leg-of-mutton each summit of minimal color _{R_min}, y _{R_min}, x _{G_min}, y _{G_min}, x _{B_min}, y _{B_min}] be each primary colours benchmark chromaticity coordinate of whole display screen;

Determine the Benchmark brightness [B of each primary colours _{R_min}, B _{G_min}, B _{B_min}], i.e. the primary color space inscribe minimum brightness numerical value of benchmark chrominance space;

3) parameter of YC is done to separation, be directed to the coefficient table that any one pixel [m, n] [i, j] in each module all forms a gamma correction

$K_{\mathrm{pix}\_[m,n][i,j]}=\left[\begin{array}{ccc}{k}_1& 0& 0\\ 0& k_2& 0\\ 0& 0& k_3\end{array}\right]=\left[\begin{array}{ccc}{B}_{r\_\min }/B_{r\_[m,n][i,j]}& 0& 0\\ 0& B_{g\_\min }/B_{g\_[m,n][i,j]}& 0\\ 0& 0& B_{b\_\min }/B_{b\_[m,n][i,j]}\end{array}\right]---\left(86\right)$

K wherein _{Pix_[m, n] [i, j]}Brightness correction coefficients for pixel [m, n] [i, j]; K ₁, K ₂, K ₃Be respectively the red, green, blue brightness correction coefficients of pixel [m, n] [i, j];

4), for any one module [m, n], form the module chromaticity space transformation parameter matrix

$M_{G\_[m,n]}=\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}\end{array}\right]---\left(87\right)$

Wherein the every element of matrix is

5) utilize step 3) brightness correction coefficients table and step 4) the Real Time Drive of module chromaticity space transformation parameter matrix after being proofreaied and correct show data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}]:

$\left[\begin{array}{c}{R}_{[m,n][i,j]}\\ G_{[m,n][i,j]}\\ B_{[m,n][i,j]}\end{array}\right]=K_{\mathrm{pix}\_[m,n][i,j]}{M}_{G\_[m,n]}\left[\begin{array}{c}R\\ G\\ B\end{array}\right]$

Wherein R, G, B are respectively red, green, blue input demonstration data;

6) utilize step 5) Real Time Drive that obtains shows data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}] the driving display screen.

The primary colours explicit function characteristic of supposing the display screen that need to carry out color space convert is all linear relationship, and linear coefficient is 1; Only need the real-time input of each display pixel is shown to data, each pixel red, green, blue Real Time Drive after utilizing formula (93) to be adjusted shows data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}], make all display pixels of whole display screen demonstrate the basically identical [X of same benchmark colourity spatial color _{Min_[m, n] [i, j]}Y _{Min_[m, n] [i, j]}Z _{Min_[m, n] [i, j]}], its color distortion all, within " color tolerance " scope, reaches the purpose of LED display correction of color uniformity.

Described step 5), in, utilize step 3) brightness correction coefficients table and step 4) the Real Time Drive of module chromaticity space transformation parameter matrix after being proofreaied and correct show data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}] method as follows:

At first utilizing step 3) the brightness correction coefficients table that obtains revised the brightness of each pixel of display screen, the brightness number M after being proofreaied and correct _{T[m, n] [i, j]}:

$M_{T_{[m,n][i,j]}}=\left[\begin{array}{c}R\\ G\\ B\end{array}\right]\left[\begin{array}{ccc}{k}_1& k_2& k_3\end{array}\right]=\left[\begin{array}{ccc}{B}_{r\_\min }/B_{r\_[m,n][i,j]}R& B_{g\_\min }/B_{g\_[m,n][i,j]}R& B_{b\_\min }/B_{b\_[m,n][i,j]}R\\ B_{r\_\min }{/B}_{r\_[m,n][i,j]}G& B_{g\_\min }/B_{g\_[m,n][i,j]}G& B_{b\_\min }/B_{b\_[m,n][i,j]}G\\ B_{r\_\min }/B_{r\_[m,n][i,j]}B& B_{g\_\min }{/B}_{g\_[m,n][i,j]}B& B_{b\_\min }/B_{b\_[m,n][i,j]}B\end{array}\right]---\left(91\right)$

Then utilize the brightness number M after proofreading and correct _{T[m, n] [i, j]}And step 4) the module chromaticity space transformation parameter matrix obtained obtains the chromaticity space transformation parameter matrix of each pixel of display screen:

$M_{T_{[m,n][i,j]}}^c=M_{G\_[m,n]}{M}_{T_{[m,n][i,j]}}$

$=\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}\end{array}\right]\left[\begin{array}{ccc}{B}_{r\_\min }/B_{r\_[m,n][i,j]}R& B_{g\_\min }/B_{g\_[m,n][i,j]}R& B_{b\_\min }/B_{b\_[m,n][i,j]}R\\ B_{r\_\min }/B_{r\_[m,n][i,j]}G& B_{g\_\min }{B}_{g\_[m,n][i,j]}G& B_{b\_\min }/B_{b\_[m,n][i,j]}G\\ B_{r\_\min }/B_{r\_[m,n][i,j]}B& B_{g\_\min }/B_{g\_[m,n][i,j]}B& B_{b\_\min }/B_{b\_[m,n][i,j]}B\end{array}\right]---\left(92\right)$

Finally utilize each pixel chromaticity space transformation parameter matrix to complete the Color correction of modules, obtain each pixel Real Time Drive and show data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}]:

$\left[\begin{array}{c}{R}_{[m,n][i,j]}\\ G_{[m,n][i,j]}\\ B_{[m,n][i,j]}\end{array}\right]=\left[\begin{array}{c}{M}_{T_{[m,n][i,j]}}^c\left(\mathrm{1,1}\right)\\ M_{T_{[m,n][i,j]}}^c\left(\mathrm{2,2}\right)\\ M_{T_{[m,n][i,j]}}^c\left(\mathrm{3,3}\right)\end{array}\right]---\left(93\right)$

$M_{T[m,n][i,j]}^C\left(\mathrm{1,1}\right)={\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}(B_{r\_\min }/B_{r\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}(B_{r\_\min }/B_{r\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}\left(B_{r\_\min }{/B}_{r\_[m,n][i,j]}\right)B$

$M_{T[m,n][i,j]}^C\left(\mathrm{2,2}\right)={\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}(B_{g\_\min }/B_{g\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}(B_{g\_\min }/B_{g\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}\left(B_{g\_\min }{/B}_{g\_[m,n][i,j]}\right)B$

$M_{T[m,n][i,j]}^C\left(\mathrm{3,3}\right)={\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}(B_{b\_\min }/B_{b\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}(B_{b\_\min }/B_{b\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}\left(B_{g\_\min }{/B}_{g\_[m,n][i,j]}\right)B$

The said method characteristics are: utilize luminance and chrominance separately-acquiring comparatively fast to obtain effective light tone degree parameter, further the parameter of YC is done to separation, be directed to any one the pixel [m in each module, n] [i, j] all form the coefficient table of a gamma correction, for any one module [m, n], according to the method for chromaticity correction, form the module chromaticity space transformation parameter matrix; The mode of pursuing the module correction by colourity after above-mentioned first brightness pointwise correction correctly completes the correction of LED display light tone degree uniformity.For comprising M * N display module, the display screen that each display module comprises I * J pixel, the brightness correction coefficients of each pixel primary colours is 3 * M * N * I * J memory cell, and the chromaticity space transformation parameter matrix unit of each display module have 9 * M * N memory cell.

Described step 5), in, utilize step 3) brightness correction coefficients table and step 4) the Real Time Drive of module chromaticity space transformation parameter matrix after being proofreaied and correct show data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}] method can also adopt following steps:

At first utilize the module chromaticity space transformation parameter matrix to carry out Color correction to the display screen modules, obtain revised demonstration data [R _{[m, n]}, G _{[m, n]}, B _{[m, n]}]:

$\left[\begin{array}{c}{R}_{[m,n]}\\ G_{[m,n]}\\ B_{[m,.n]}\end{array}\right]=M_{G\_[m,n]}\left[\begin{array}{c}R\\ G\\ B\end{array}\right]=\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}R& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}R& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}R\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}G& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}G& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}G\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}B& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}B& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}B\end{array}\right]$

Then utilize step 3) the brightness correction coefficients table that obtains and revise and show data [R _{[m, n]}, G _{[m, n]}, B _{[m, n]]}Complete the correction of each pixel intensity, the Real Time Drive that obtains each pixel of display screen shows data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}];

$\left[\begin{array}{c}{R}_{[m,n][i,j]}\\ G_{[m,n][i,j]}\\ B_{[m,n][i,j]}\end{array}\right]=K_{\mathrm{pix}\_[m,n][i,j]}\left[\begin{array}{c}{R}_{[m,n]}\\ G_{[m,n]}\\ B_{[m,n]}\end{array}\right]$

$=\left[\begin{array}{ccc}{B}_{r\_\min }/B_{r\_[m,n][i,j]}& 0& 0\\ 0& B_{g\_\min }/B_{g\_[m,n][i,j]}& 0\\ 0& 0& B_{b\_\min }/B_{b\_[m,n][i,j]}\end{array}\right]\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}R& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}R& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}R\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}G& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}G& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}G\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}B& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}B& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}B\end{array}\right]$

$=\left[\begin{array}{c}{M}_{T_{[m,n][i,j]}}^c\left(\mathrm{1,1}\right)\\ M_{T_{[m,n][i,j]}}^c\left(\mathrm{2,2}\right)\\ M_{T_{[m,n][i,j]}}^c\left(\mathrm{3,3}\right)\end{array}\right]$

$M_{T[m,n][i,j]}^C\left(\mathrm{1,1}\right)={\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}(B_{r\_\min }/B_{r\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}(B_{r\_\min }/B_{r\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}\left(B_{r\_\min }{/B}_{r\_[m,n][i,j]}\right)B$

$M_{T[m,n][i,j]}^C\left(\mathrm{2,2}\right)={\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}(B_{g\_\min }/B_{g\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}(B_{g\_\min }/B_{g\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}\left(B_{g\_\min }{/B}_{g\_[m,n][i,j]}\right)B$

$M_{T[m,n][i,j]}^C\left(\mathrm{3,3}\right)={\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}(B_{b\_\min }/B_{b\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}(B_{b\_\min }/B_{b\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}\left(B_{g\_\min }{/B}_{g\_[m,n][i,j]}\right)B$

Said method is mainly the color distortion between first adjusting module, unifies to control again the brightness situation of each pixel after adjusting color, now owing to not relating to color conversion, proofreaies and correct and becomes relatively easy.

The method characteristics mainly are, utilize luminance and chrominance separately-acquiring comparatively fast to obtain effective light tone degree parameter, be directed to any one the pixel [m in each module, n] [i, j] all form the coefficient table of a gamma correction, for any one module [m, n], according to the method for chromaticity correction, form the module chromaticity space transformation parameter matrix; Complete the correction of LED display light tone degree uniformity by first colourity by the mode of brightness pointwise correction after the module correction.The brightness correction coefficients of each pixel primary colours is 3 * M * N * I * J memory cell, and the chromaticity space transformation parameter matrix unit of each display module have 9 * M * N memory cell, and control flow is simple, is that more effectively the light tone degree separates the scheme of proofreading and correct.

The step of wherein determining each primary colours benchmark chromaticity coordinate of display screen is as follows:

A, according to the chromaticity coordinate [x of each display pixel _{R_[m, n]}, y _{R_[m, n]}], [x _{G_[m, n]}, y _{G_[m, n]}] and [x _{B_[m, n}, y _{B_[m, n]}], indicate its position on colorimetric plane figure;

B, set up the linear equation line_rg between red primary and green primary _{[m, n]}, the linear equation line_rb between red primary and blue primary _{[m, n]}, the linear equation line_gb between green primary and blue primary _{[m, n]}Obtain 3 straight lines bunch, be respectively red green straight line bunch, red blue straight line bunch and turquoise straight line bunch;

C, at red green straight line bunch and red blue straight line bunch, locate the straight intersection point set of shape, therefrom select apart from reference white field chromaticity coordinate [x _w, y _w] the shortest point of distance is as red primary benchmark chromaticity coordinate [x _{R_min}, y _{R_min]}]; Locate the straight intersection point set of shape at red green straight line bunch with turquoise straight line bunch, therefrom select apart from reference white field chromaticity coordinate [x _w, y _w] the shortest point of distance is as green primary benchmark chromaticity coordinate [x _{G_min}, y _{G_min]}]; Locate the straight intersection point set of shape at turquoise straight line bunch with red blue straight line bunch, therefrom select apart from reference white field chromaticity coordinate [x _w, y _w] the shortest point of distance is as blue primary benchmark chromaticity coordinate [x _{B_min}, y _{B_min]}];

Wherein determine the Benchmark brightness [B of each primary colours _{R_min}, B _{G_min}, B _{B_min}] concrete steps as follows:

A, mistake red primary benchmark chromaticity coordinate [x _{R_min}, y _{R_min]}] point, the green primary benchmark chromaticity coordinate [x at place _{G_min}, y _{G_min]}] point and the blue primary benchmark chromaticity coordinate [x at place _{B_min}, y _{B_min]}] point at place does the straight line perpendicular to colorimetric plane, usings these 3 straight lines as benchmark colourity georeferencing line;

B, each pixel colourity space coordinates point [x _{R_[m, n]}, y _{R_[m, n]}, B _{R_[m, n] [i, j]}], [x _{G_[m, n]}, y _{G_[m, n]}, B _{G_[m, n] [i, j]}] and [x _{B_[m, n}, y _{B_[m, n]}, B _{B_[m, n] [i, j]}] the plane plane_rgb that forms _{[m, n] [i, j]}Intersect with 3 benchmark colourity georeferencing lines, obtain 3 groups of space coordinates point set, they are distributed on 3 benchmark colourity georeferencing lines, and brightness number is respectively [B _{R_[m, n] [i, j] _ min}], [B _{G_[m, n] [i, j] _ min}] and [B _{B_[m, n] [i, j] _ min}]; At space coordinates point set [x _{R_min}, y _{R_min}, B _{R_[m, n] [i, j] _ min}] in choose [B _{R_[m, n] [i, j] _ min}] minimum chrominance space point, the Benchmark brightness B using the brightness of this spatial point as red primary _{R_min}At space coordinates point set [x _{G_min}, y _{G_min}, B _{G_[m, n] [i, j] _ min}] in choose [B _{G_[m, n] [i, j] _ min}] minimum chrominance space point, the Benchmark brightness B using the brightness of this spatial point as green primary _{G_min}At space coordinates point set [x _{B_min}, y _{B_min}, B _{B_[m, n] [i, j] _ min}] in choose [B _{B_[m, n] [i, j] _ min}] minimum chrominance space point, the Benchmark brightness B using the brightness of this spatial point as blue primary _{B_min}.

The accompanying drawing explanation:

Fig. 1 is that the LED panel display screen chrominance space parameter differences schematic diagram occurs with modular form.

Fig. 2 is that the LED panel display screen chrominance space parameter differences schematic diagram occurs with pixel form.

Fig. 3 is that each benchmark primary colours chromaticity coordinate of LED panel display screen is determined schematic diagram.

The control system structural representation of realizing the LED display uniformity correcting method for separating brightness and chromaticity that Fig. 4 is embodiment 1.

The control system structural representation of realizing the LED display uniformity correcting method for separating brightness and chromaticity of Fig. 5 embodiment 2.

The control system structural representation of realizing the LED display uniformity correcting method for separating brightness and chromaticity that Fig. 6 is embodiment 3.

Fig. 7 is the red color demonstration situation schematic diagram of panel display screen through the correction of colourity module.

Fig. 8 be the correction of panel display screen colourity module again the red color after the brightness pointwise correction show the situation schematic diagram.

The control system structural representation of realizing the LED display uniformity correcting method for separating brightness and chromaticity that Fig. 9 is embodiment 4.

Embodiment:

Embodiment 1:

1) (comprise that M is capable, N row display module for LED display, comprise in each display module that I is capable, J row pixel), in view of the colourity difference in display module can be ignored, colourity in display module is considered as identical, utilize light tone degree detector to obtain the chromaticity coordinate of M * N module of LED display, the chromaticity coordinate of all like this display pixels is determined.So have:

$\left\{\begin{array}{c}{x}_{r\_[m,n][i,j]}=x_{r\_[m,n]}=x_{r_{m\_n}}\\ y_{r\_[m,n][i,j]}=y_{r\_[m,n]}=y_{r_{m\_n}}\\ x_{g\_[m,n][i,j]}=x_{g\_[m,n]}=x_{g_{m\_n}}\\ y_{g\_[m,n][i,j]}=y_{g\_[m,n]}=y_{g_{m\_n}}\\ x_{b\_[m,n][i,j]}=x_{b\_[m,n]}\text{=}{x}_{b_{m\_n}}\\ y_{b\_[m,n][i,j]}=y_{b\_[m,n]}=y_{b_{m\_n}}\end{array}\right.---\left(14\right)$

X _{R_[m, n]}, y _{R_[m, n]}, x _{G_[m, n]}, y _{G_[m, n]}, x _{B_[m, n]}, y _{B_[m, n]}The red primary X chromaticity coordinate, red primary Y chromaticity coordinate, green primary X chromaticity coordinate, green primary Y chromaticity coordinate, blue primary X chromaticity coordinate, the blue primary Y chromaticity coordinate that mean respectively the m_n module; For these chromaticity coordinates of easier expression, can be designated as

(2) gather the luminance parameter of each display pixel, obtain the luminance parameter [B of each display pixel _{R_[m, n] [i, j]}, B _{G_[m, n] [i, j]}, B _{B_[m, n] [i, j]}].

(3) like this for the i_j pixel of m_n module, its chroma parameter set is combined into [x _{R_[m, n]}, y _{R_[m, n]}, x _{G_[m, n]}, y _{G_[m, n]}, x _{B_[m, n}, y _{B_[m, n]}, B _{R[m, n] [i, j]}, B _{G_[m, n] [i, j]}, B _{B_[m, n] [i, j]}].

(4) determine the minimal color triangle coverage that the chromaticity coordinate of all display pixels surrounds, the chromaticity coordinate on this leg-of-mutton each summit of minimal color is each benchmark primary colours chromaticity coordinate of whole screen [x _{R_min}, y _{R_min]}], [x _{G_min}, y _{G_min]}], [x _{B_min}, y _{B_min]}] and the Benchmark brightness [B of each primary colours _{R_min}, B _{G_min}, B _{B_min}].

(5) parameter of YC is done to separation, be directed to the coefficient table that any one pixel [m, n] [i, j] in each module all forms a gamma correction

$K_{\mathrm{pix}\_[m,n][i,j]}=\left[\begin{array}{ccc}{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">k</figure-callout>}}_1& 0& 0\\ 0& k_2& 0\\ 0& 0& k_3\end{array}\right]=\left[\begin{array}{ccc}{B}_{r\_\min }/B_{r\_[m,n][i,j]}& 0& 0\\ 0& B_{g\_\min }/B_{g\_[m,n][i,j]}& 0\\ 0& 0& B_{b\_\min }/B_{b\_[m,n][i,j]}\end{array}\right]---\left(86\right)$

(6), for any one module [m, n], form the module chromaticity space transformation parameter matrix

$M_{G\_[m,n]}=\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{rr}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{rg}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{rb}}\\ {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{gr}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{gg}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{gb}}\\ {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{br}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{bg}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{bb}}\end{array}\right]=\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}\end{array}\right]$

Be the chroma conversion matrix parameter of m_n module for the standard colorimetric space, in order to mean better the Color correction method of brightness, chrominance separation, shield the parameter of each pixel and modules difference corresponding standard colorimetric space transition matrix simultaneously for differential display, thereby the transition matrix parameter of modules can be designated as

Wherein the every element of matrix is

The primary colours explicit function characteristic of supposing the display screen that need to carry out color space convert is all linear relationship, and linear coefficient is 1, and input shows that data R, G, B are original input and show data.Only need the original real-time input of each display pixel is shown to data, utilize formula (91), can complete the gamma correction of each pixel of display screen:

$M_{T_{[m,n][i,j]}}=\left[\begin{array}{c}R\\ G\\ B\end{array}\right]\left[\begin{array}{ccc}{k}_1& k_2& k_3\end{array}\right]\left[\begin{array}{cccccc}{B}_{r\_\min }{/B}_{r\_[m,n][i,j]}R& & B_{g\_\min }/B_{g\_[m,n][i,j]}R& & B_{b\_\min }/B_{b\_[m,n][i,j]}R& \\ B_{r\_\min }/B_{r\_[m,n][i,j]}G& & B_{g\_\min }/B_{g\_[m,n][i,j]}G& & B_{b\_\min }/B_{b\_[m,n][i,j]}G& \\ B_{r\_\min }/B_{r\_[m,n][i,j]}G& & B_{g\_\min }/B_{g\_[m,n][i,j]}G& & B_{b\_\min }/B_{b\_[m,n][i,j]}G& \end{array}\right]---\left(91\right)$

(7) then complete the Color correction of modules

$M_{T_{[m,n][i,j]}}^c=M_{G\_[m,n]}{M}_{T_{[m,n][i,j]}}$

$=\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}\end{array}\right]\left[\begin{array}{ccc}{B}_{r\_\min }/B_{r\_[m,n][i,j]}R& B_{g\_\min }/B_{g\_[m,n][i,j]}R& B_{b\_\min }/B_{b\_[m,n][i,j]}R\\ B_{r\_\min }/B_{r\_[m,n][i,j]}G& B_{g\_\min }{B}_{g\_[m,n][i,j]}G& B_{b\_\min }/B_{b\_[m,n][i,j]}G\\ B_{r\_\min }/B_{r\_[m,n][i,j]}B& B_{g\_\min }/B_{g\_[m,n][i,j]}B& B_{b\_\min }/B_{b\_[m,n][i,j]}B\end{array}\right]---\left(92\right)$

Utilize the chromaticity space transformation parameter matrix of display pixel to carry out real-time operation, the Real Time Drive that can obtain after each display pixel is adjusted shows data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}];

$\left[\begin{array}{c}{R}_{[m,n][i,j]}\\ G_{[m,n][i,j]}\\ B_{[m,n][i,j]}\end{array}\right]=\left[\begin{array}{c}{M}_{T_{[m,n][i,j]}}^c\left(\mathrm{1,1}\right)\\ M_{T_{[m,n][i,j]}}^c\left(\mathrm{2,2}\right)\\ M_{T_{[m,n][i,j]}}^c\left(\mathrm{3,3}\right)\end{array}\right]---\left(93\right)$

Utilize the Real Time Drive after adjusting to show data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}] make all display pixels of whole display screen demonstrate the basically identical [X of same benchmark colourity spatial color _{Min_[m, n] [i, j]}Y _{Min_[m, n] [i, j]}Z _{Min_[m, n] [i, j]}], its color distortion all, within " color tolerance " scope, reaches the purpose of LED display correction of color uniformity.

Realize the device of LED display uniformity correcting method for separating brightness and chromaticity in the present embodiment as shown in Figure 4, chrominance space real time data Correction and Control system comprises that the red primary input shows that recording controller 1, green primary input show that recording controller 2, blue primary input show recording controller 3, master control logic 4, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rr ^{[m, n]}buffer 5, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rg ^{[m, n]}buffer 6, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rb ^{[m, n]}buffer 7, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gr ^{[m, n]}buffer 8, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gg ^{[m, n]}buffer 9, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gb ^{[m, n]}buffer 10, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _br ^{[m, n]}buffer 11, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _bg ^{[m, n]}buffer 12, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _bb ^{[m, n]}buffer 13, the current red primary brightness correction parameter B that carries out the display pixel of computing _{r_min}/ B _{r_[m, n] [i, j]}buffer 47, the current green primary brightness correction parameter B that carries out the display pixel of computing _{g_min}/ B _{g_[m, n] [i, j]}buffer 48, the current blue primary brightness correction parameter B that carries out the display pixel of computing _{b_min}/ B _{b_[m, n] [i, j]}buffer 49, red primary operational multiplier 14, 15, 16, green primary operational multiplier 17, 18, 19, blue primary operational multiplier 20, 21, 22, red primary computing adder 23, green primary computing adder 24, blue primary computing adder 25, red primary drives and shows data 26, green primary drives and shows data 27, blue primary drives and shows data 28, the red primary input shows data buffer 29, the green primary input shows data buffer 30, the blue primary input shows data buffer 31, the driving that current display pixel red primary has converted shows data buffer 32, the driving that current display pixel green primary has converted shows data buffer 33, the driving that current display pixel blue primary has converted shows data buffer 34, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rr ^{[m, n]}memory 35, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rg ^{[m, n]}memory 36, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rb ^{[m, n]}memory 37, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gr ^{[m, n]}memory 38, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gg ^{m, n]}memory 39, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gb ^{[m, n]}memory 40, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _br ^{[m, n]}memory 41, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _bg ^{[m, n]}memory 42, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _bb ^{[m, n]}memory 43, the red primary brightness correction parameter B of all display pixels of display screen _{r_min}/ B _{r_[m, n] [i, j]}memory 44, the green primary brightness correction parameter B of all display pixels of display screen _{g_min}/ B _{g_[m, n] [i, j]}memory 45, the blue primary brightness correction parameter B of all display pixels of display screen _{b_min}/ B _{b_[m, n] [i, j]}memory 46, be directed to the red primary brightness pointwise correction multiplier 50 of red primary colourity multiplying, be directed to the green primary brightness pointwise correction multiplier 53 of red primary colourity multiplying, be directed to the blue primary brightness pointwise correction multiplier 56 of red primary colourity multiplying, be directed to the red primary brightness pointwise correction multiplier 51 of green primary colourity multiplying, be directed to the green primary brightness pointwise correction multiplier 54 of green primary colourity multiplying, be directed to the blue primary brightness pointwise correction multiplier 57 of green primary colourity multiplying, be directed to the red primary brightness pointwise correction multiplier 52 of blue primary colourity multiplying, be directed to the green primary brightness pointwise correction multiplier 55 of blue primary colourity multiplying, be directed to the blue primary brightness pointwise correction multiplier 58 of blue primary colourity multiplying, the quick-reading flow sheets of controlling is: master control logic 4 produces the basic clock signal of control circuit, red primary input demonstration recording controller 1, green primary input show that recording controller 2, blue primary input show that continuous each display pixel of input of recording controller 3 each primary colours in this moment show data in real time, under the signal controlling of master control logic 4, the current chromaticity space transformation parameter matrix element buffer 5,6,7,8,9,10,11,12,13 that carries out the display pixel of computing can be obtained the display pixel chromaticity space transformation parameter matrix element [ξ that this moment needs to participate in computing from corresponding memory 35,36,37,38,39,40,41,42,43 simultaneously _rr ^{[m, n]}ξ _rg ^{[m, n]}ξ _rb ^{[m, n]}ξ _gr ^{[m, n]}ξ _gg ^{[m, n]}ξ _gb ^{[m, n]}ξ _br ^{[m, n]}ξ _bg ^{[m, n]}ξ _bb ^{[m, n]}], current each luminance primary correction parameter buffer 47,48,49 that carries out the display pixel of computing can be obtained the display pixel brightness correction parameter [B that this moment needs to participate in the computing of brightness pointwise correction from corresponding memory 44,45,46 _{r_min}/ B _{r_[m, n] [i, j]}B _{g_min}/ B _{g_[m, n] [i, j]}B _{b_min}/ B _{b_[m, n] [i, j]}], the red primary brightness pointwise correction multiplier 50, green primary brightness pointwise correction multiplier 53, the blue primary brightness pointwise correction multiplier 56 that are directed to the multiplying of red primary colourity complete the brightness point by point correction of each front pixel of red primary colourity multiplying, the red primary brightness pointwise correction multiplier 51, green primary brightness pointwise correction multiplier 54, the blue primary brightness pointwise correction multiplier 57 that are directed to the multiplying of green primary colourity complete the brightness point by point correction of each front pixel of green primary colourity multiplying, the red primary brightness pointwise correction multiplier 52, green primary brightness pointwise correction multiplier 55, the blue primary brightness pointwise correction multiplier 58 that are directed to the multiplying of blue primary colourity complete the brightness point by point correction of each front pixel of blue primary colourity multiplying, red primary operational multiplier 14,15,16 has been used for the matrix multiplication operation of red primary, green primary operational multiplier 17,18,19 has been used for the matrix multiplication operation of green primary, blue primary operational multiplier 20,21,22 has been used for the matrix multiplication operation of blue primary, red primary computing adder 23 is used for forming the red primary driving demonstration data that respective display pixel has finally converted, green primary computing adder 24 is used for forming the green primary driving demonstration data that respective display pixel has finally converted, blue primary computing adder 25 is used for forming the blue primary driving demonstration data that respective display pixel has finally converted, red primary shows that data buffer 29 is used for the input of buffer memory red primary and shows that data prepare to carry out computing, green primary shows that data buffer 30 is used for the input of buffer memory green primary and shows that data prepare to carry out computing, blue primary shows that data buffer 31 is used for the input of buffer memory blue primary and shows that data prepare to carry out computing, red primary has converted and has shown that data buffer 32 is used for the buffer memory red primary and drives and show that data prepare output, green primary has converted and has shown that data buffer 33 is used for the buffer memory green primary and drives and show that data prepare output, blue primary has converted and has shown that data buffer 34 is used for the buffer memory blue primary and drives and show that data prepare output.

Each display pixel for each display frame of display screen constantly carries out aforesaid operations, until complete the conversion of the whole pixel datas of a whole frame video image; Carry out same operation at the next frame video image, completed the correction of the full screen light tone degree unification of LED display, guaranteed the demonstration of high-quality video image.

The method characteristics mainly are, utilize luminance and chrominance separately-acquiring comparatively fast to obtain effective light tone degree parameter, further the parameter of YC is done to separation, be directed to the coefficient table that any one pixel [m, n] [i, j] in each module all forms a gamma correction, for any one module [m, n], according to the method for chromaticity correction, form the module chromaticity space transformation parameter matrix; The mode of pursuing the module correction by colourity after above-mentioned first brightness pointwise correction correctly completes the correction of LED display light tone degree uniformity.The brightness correction coefficients of each pixel primary colours is 3 * M * N * I * J memory cell, and the chromaticity space transformation parameter matrix unit of each display module have 9 * M * N memory cell.In the present embodiment, because the display characteristic of LED is unanimous on the whole, so do not relate to the conversion of explicit function aspect in Linear Transformation, still the display characteristic due to LED is not exclusively also linear, so also have in the specific implementation some concrete schemes.

Embodiment 2

Consider that the display characteristic of LED is not exclusively for linear, need to be converted into linear data when advancing the line brightness/chrominance correction carries out real-time operation, also will carry out the output of data after computing sometimes completes, so also need once reverse.

The explicit function characteristic of supposing each primary colours of LED herein, is:

$\left\{\begin{array}{c}{R}_L={\mathrm{\&Phi;}}_R\left(R\right)\\ G_L={\mathrm{\&Phi;}}_G\left(G\right)\\ B_L={\mathrm{\&Phi;}}_B\left(B\right)\end{array}\right.---\left(95\right)$

Wherein [R G B] is that original input shows data, [R _LG _LB _L] be to show the display brightness of the corresponding primary colours of data, [Φ through the input of explicit function conversion _R(R) Φ _G(G) Φ _B(B)] the explicit function of corresponding corresponding primary colours, this explicit function is the corresponding relation function of display data and display brightness, is generally Φ _R(R)=R ^γIndex show, the general range of γ from 1 to 2.8 does not wait, and depending on the concrete condition of display, determines, this point has detailed explanation in patent 03127037.9, just exceeds description herein.If the result after proofreading and correct directly applies to demonstration, do not need reverseization; But sometimes need the LED controller that offers other to use, for the output of data after convenient the correction, suppose

$\left\{\begin{array}{c}{\mathrm{\&psi;}}_R\left(R_L\right)={{\mathrm{\&Phi;}}^{-1}}_R\left(R_L\right)\\ {\mathrm{\&psi;}}_G\left(G_L\right)={{\mathrm{\&Phi;}}^{-1}}_G\left(G_L\right)\\ {\mathrm{\&psi;}}_B\left(B_L\right)={{\mathrm{\&Phi;}}^{-1}}_B\left(B_L\right)\end{array}\right.---\left(96\right)$

For the demonstration inverse function expression formula of each primary colours of LED, wherein [R _LG _LB _L] be the display brightness of corresponding primary colours, [Φ _R ^-1(R _L) Φ _G ^-1(G _L) Ф _B ^-1(B _L)] inverse function of the explicit function of corresponding corresponding primary colours, [ψ _R(R _L) ψ _G(G _L) ψ _B(B _L)] be the reverseization function.

As shown in Figure 5: after the first brightness pointwise correction of the embodiment of the present invention 2, colourity is as follows by the separate type homogeneity correction course of work of module correction:

The same manner as in Example 1, consider the requirement of the conversion aspect of light tone degree correction front and back data, the present embodiment will show that respectively data buffer and conversion complete the demonstration data buffer and change explicit function converter and reverseization functional converter into, its concise and to the point composition as shown in Figure 5, comprise that the red primary input shows that recording controller 1, green primary input show that recording controller 2, blue primary input show recording controller 3, master control logic 4, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rr ^{[m, n]}buffer 5, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rg ^{[m, n]}buffer 6, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rb ^{[m, n]}buffer 7, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gr ^{[m, n]}buffer 8, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gg ^{[m, n]}buffer 9, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gb ^{[m, n]}buffer 10, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _br ^{[m, n]}buffer 11, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _bg ^{[m, n]}buffer 12, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _bb ^{[m, n]}buffer 13, the current red primary brightness correction parameter B that carries out the display pixel of computing _{r_min}/ B _{r_[m, n] [i, j]}buffer 47, the current green primary brightness correction parameter B that carries out the display pixel of computing _{g_min}/ B _{g_[m, n] [i, j]}buffer 48, the current blue primary brightness correction parameter B that carries out the display pixel of computing _{b_min}/ B _{b_[m, n] [i, j]}buffer 49, red primary operational multiplier 14, 15, 16, green primary operational multiplier 17, 18, 19, blue primary operational multiplier 20, 21, 22, red primary computing adder 23, green primary computing adder 24, blue primary computing adder 25, red primary drives and shows data 26, green primary drives and shows data 27, blue primary drives and shows data 28, red primary explicit function converter 29 ', green primary explicit function converter 30 ', blue primary explicit function converter 31 ', reverse functional converter 32 after current display pixel red primary has converted ', reverse functional converter 33 after current display pixel green primary has converted ', reverse functional converter 34 after current display pixel blue primary has converted ', the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rr ^{[m, n]}memory 35, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rg ^{[m, n]}memory 36, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rb ^{[m, n]}memory 37, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gr ^{[m, n]}memory 38, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gg ^{m, n]}memory 39, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gb ^{[m, n]}memory 40, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _br ^{[m, n]}memory 41, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _bg ^{[m, n]}memory 42, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _bb ^{[m, n]}memory 43, the red primary brightness correction parameter B of all display pixels of display screen _{r_min}/ B _{r_[m, n] [i, j]}memory 44, the green primary brightness correction parameter B of all display pixels of display screen _{g_min}/ B _{g_[m, n] [i, j]}memory 45, the blue primary brightness correction parameter B of all display pixels of display screen _{b_min}/ B _{b_[m, n] [i, j]}memory 46, be directed to the red primary brightness pointwise correction multiplier 50 of red primary colourity multiplying, be directed to the green primary brightness pointwise correction multiplier 53 of red primary colourity multiplying, be directed to the blue primary brightness pointwise correction multiplier 56 of red primary colourity multiplying, be directed to the red primary brightness pointwise correction multiplier 51 of green primary colourity multiplying, be directed to the green primary brightness pointwise correction multiplier 54 of green primary colourity multiplying, be directed to the blue primary brightness pointwise correction multiplier 57 of green primary colourity multiplying, be directed to the red primary brightness pointwise correction multiplier 52 of blue primary colourity multiplying, be directed to the green primary brightness pointwise correction multiplier 55 of blue primary colourity multiplying, be directed to the blue primary brightness pointwise correction multiplier 58 of blue primary colourity multiplying.

The course of work is: master control logic 4 produces data strobe signal and sends the red primary input to by control line a and shows that recording controller 1, green primary input show that recording controller 2, blue primary input show recording controller 3 in the cycle at each display pixel, make red primary input show data by data wire e input to red primary explicit function converter 29 ', green primary input show data by data wire f input to green primary explicit function converter 30 ', the blue primary input show data by data wire g input to blue primary explicit function converter 31 ', make the red primary transform data input to the red primary brightness pointwise correction multiplier 50 that is directed to the multiplying of red primary colourity by data wire u, be directed to the red primary brightness pointwise correction multiplier 51 of green primary colourity multiplying, be directed to the red primary brightness pointwise correction multiplier 52 of blue primary colourity multiplying, the green primary transform data inputs to the green primary brightness pointwise correction multiplier 53 that is directed to the multiplying of red primary colourity by data wire v, be directed to the green primary brightness pointwise correction multiplier 54 of green primary colourity multiplying, be directed to the green primary brightness pointwise correction multiplier 55 of blue primary colourity multiplying, the blue primary transform data inputs to the blue primary brightness pointwise correction multiplier 56 that is directed to the multiplying of red primary colourity by data wire w, be directed to the blue primary brightness pointwise correction multiplier 57 of green primary colourity multiplying, be directed to the blue primary brightness pointwise correction multiplier 58 of blue primary colourity multiplying, meanwhile, control logic 4 produces current display pixel brightness correction parameter gating signal by address wire b ₁send the red primary brightness correction parameter memory 44 of display screen display pixel to, green primary brightness correction parameter memory 45, blue primary brightness correction parameter memory 46, and send current each luminance primary correction parameter that participates in computing that needs to current red primary brightness correction parameter buffer 47, green primary brightness correction parameter buffer 48, the blue primary brightness correction parameter buffer 49 that carries out computing by data wire B1, B2, B3, by data wire B4, corresponding bright correction parameter data are transported to respectively again to the red primary brightness pointwise correction multiplier 50 of red primary colourity multiplying, the red primary brightness pointwise correction multiplier 53 of green primary colourity multiplying, the red primary brightness pointwise correction multiplier 56 of blue primary colourity multiplying, by data wire B5, corresponding bright correction parameter data are transported to respectively to the red primary brightness pointwise correction multiplier 51 of green primary colourity multiplying, the green primary brightness pointwise correction multiplier 54 of green primary colourity multiplying, the blue primary brightness pointwise correction multiplier 57 of green primary colourity multiplying, by data wire B6, corresponding bright correction parameter data are transported to respectively to the red primary brightness pointwise correction multiplier 52 of blue primary colourity multiplying, the green primary brightness pointwise correction multiplier 55 of blue primary colourity multiplying, in the blue primary brightness pointwise correction multiplier 58 of blue primary colourity multiplying, control logic 4 produces current display module chromaticity transformation parameter gating signal simultaneously and sends the chromaticity space transformation parameter matrix element memory 35,36,37,38,39,40,41,42,43 of display module by address wire b to, and passes through data wire h1, i1, j 1, k1, l1, m1, n1, p1, q1 by the current display module chromaticity space transformation parameter matrix element [ξ that needs to participate in computing _rr ^{[m, n]}ξ _rg ^{[m, n]}ξ _rb ^{[m, n]}ξ _gr ^{[m, n]}ξ _gg ^{[m, n]}ξ _gb ^{[m, n]}ξ _br ^{[m, n]}ξ _bg ^{[m, n]}ξ _bb ^{[m, n]}] send the current chromaticity space transformation parameter matrix element buffer 5,6,7,8,9,10,11,12,13 that carries out the display pixel of computing to, make corresponding data send red primary operational multiplier 14,15,16 to by data wire h, i, j, k, l, m, n, p, q, green primary operational multiplier 17,18,19, blue primary operational multiplier 20,21,22, then the signal that control logic 4 produces the brightness pointwise correction passes through b ₂be sent to each luminance primary pointwise correction multiplier 50,51,52,53,54,55,56,57,58, the result that computing completes also sends respectively red primary operational multiplier 14,15,16 to by data wire, green primary operational multiplier 17,18,19, blue primary operational multiplier 20,21,22.Then control logic 4 produces the computing signal and sends red primary operational multiplier 14,15,16 to by control line c, green primary operational multiplier 17,18,19, blue primary operational multiplier 20,21,22; The intermediate object program produced is sent into red primary computing adder 23, green primary computing adder 24 and blue primary computing adder 25 by data wire r1, r2, r3, g1, g2, g3, b1, b2, b3.Under the control signal effect transmitted by control line d in control logic 4, red primary computing adder 23, green primary computing adder 24 and blue primary computing adder 25 produce the operation result of each primary colours actual quantity of current display pixel; This operation result send into respectively reverse functional converter 32 after current display pixel red primary has converted ', the reverse functional converter 33 after current display pixel green primary has converted ' and the reverse functional converter 34 of current display pixel blue primary after having converted '; Under the control signal effect transmitted by control line y in control logic 4, red primary drive characteristic inverse converter 32 ', the final operation result of green primary drive characteristic inverse converter 33 ' and blue primary drive characteristic inverse converter 34 ' produce.

Each display pixel for each display frame of display screen constantly carries out aforesaid operations, until complete the conversion of the whole pixel datas of a whole frame video image; Carry out same operation at the next frame video image, completed the correction of the full screen light tone degree unification of LED display, guaranteed the demonstration of high-quality video image.

Embodiment 3:

First colourity is by the separate type uniformity adjusting method of brightness pointwise correction after the module correction

Embodiment 1,2 adopts and first carries out each pixel intensity correction, then carries out the method for module colourity adjustment display screen is advanced to the line brightness/chrominance correction, although saved a large amount of memory spaces, its control flow is comparatively complicated.The present embodiment adopts the method for first colourity by brightness pointwise correction after the module correction, and purpose is on the basis of saving memory space, simplifies the control flow of proofreading and correct as far as possible.

The specific implementation step is as follows:

(1) in view of the colourity difference in display module, can ignore, the colourity in display module is considered as identical, utilizes light tone degree detector to obtain the chromaticity coordinate of M * N module of LED display, and the chromaticity coordinate of all like this display pixels is determined.

(2) gather the luminance parameter of each display pixel, obtain the luminance parameter [B of each display pixel _{R_[m, n] [i, j]}, B _{G_[m, n] [i, j]}, B _{B_[m, n] [i, j]}].

(3) like this for the i_j pixel of m_n module, its chroma parameter set is combined into [x _{R_[m, n]}, y _{R_[m, n]}, x _{G_[m, n]}, y _{G_[m, n]}, x _{B_[m, n}, y _{B_[m, n]}, B _{R_[m, n] [i, j]}, B _{G_[m, n] [i, j]}, B _{B_[m, n] [i, j]}].

(4) determine the minimal color triangle coverage that the chromaticity coordinate of all display pixels surrounds, the chromaticity coordinate on this leg-of-mutton each summit of minimal color is each benchmark primary colours chromaticity coordinate of whole screen [x _{R_min}, y _{R_min]}], [x _{G_min}, y _{G_min]}], [x _{B_min}, y _{B_min]}], determine the Benchmark brightness [B of each primary colours _{R_min}, B _{G_min}, B _{B_min}].

(5) parameter of YC is done to separation, be directed to the coefficient table that any one pixel [m, n] [i, j] in each module all forms a gamma correction

$K_{\mathrm{pix}\_[m,n][i,j]}=\left[\begin{array}{ccc}{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HSA00000179605500041.png,HSA00000179605500072.png"\; state="\{\{state\}\}">k</figure-callout>}}_1& 0& 0\\ 0& k_2& 0\\ 0& 0& k_3\end{array}\right]=\left[\begin{array}{ccc}{B}_{r\_\min }/B_{r\_[m,n][i,j]}& 0& 0\\ 0& B_{g\_\min }/B_{g\_[m,n][i,j]}& 0\\ 0& 0& B_{b\_\min }/B_{b\_[m,n][i,j]}\end{array}\right]---\left(86\right)$

(6), for any one module [m, n], form the module chromaticity space transformation parameter matrix

$M_{G\_[m,n]}=\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{rr}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{rg}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{rb}}\\ {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{gr}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{gg}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{gb}}\\ {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{br}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{bg}}& {\mathrm{\&zeta;}}_{[m,n]}^{\mathrm{bb}}\end{array}\right]=\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}\end{array}\right]---\left(87\right)$

Wherein the expressed content in the every element cotype of matrix (88)～(90) is identical; Utilize the module chromaticity space transformation parameter matrix to carry out Color correction to the display screen modules, obtain revised demonstration data [R _{[m, n]}, G _{[m, n]}, B _{[m, n]}]:

$\left[\begin{array}{c}{R}_{[m,n]}\\ G_{[m,n]}\\ B_{[m,n]}\end{array}\right]=M_{G\_[m,n]}\left[\begin{array}{c}R\\ G\\ B\end{array}\right]=\begin{array}{c}\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}R& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}R& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}R\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}G& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}G& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}G\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}B& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}B& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}B\end{array}\right]---\left(94\right)\end{array}$

The correction that the brightness correction coefficients table that utilizes step (3) to obtain and step (6) obtain shows data [R _{[m, n]}, G _{[m, n]}, B _{[m, n]}] completing the correction of each pixel intensity, the Real Time Drive that obtains each pixel of display screen shows data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}]:

$\left[\begin{array}{c}{R}_{[m,n][i,j]}\\ G_{[m,n][i,j]}\\ B_{[m,n][i,j]}\end{array}\right]=K_{\mathrm{pix}\_[m,n][i,j]}\left[\begin{array}{c}{R}_{[m,n]}\\ G_{[m,n]}\\ B_{[m,n]}\end{array}\right]$

$=\left[\begin{array}{ccc}{B}_{r\_\min }/B_{r\_[m,n][i,j]}& 0& 0\\ 0& B_{g\_\min }/B_{g\_[m,n][i,j]}& 0\\ 0& 0& B_{b\_\min }/B_{b\_[m,n][i,j]}\end{array}\right]\left[\begin{array}{ccc}{\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}R& {\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}R& {\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}R\\ {\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}G& {\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}G& {\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}G\\ {\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}B& {\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}B& {\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}B\end{array}\right]$

$\left[\begin{array}{c}{R}_{[m,n][i,j]}\\ G_{[m,n][i,j]}\\ B_{[m,n][i,j]}\end{array}\right]=\left[\begin{array}{c}{M}_{T_{[m,n][i,j]}}^c\left(\mathrm{1,1}\right)\\ M_{T_{[m,n][i,j]}}^c\left(\mathrm{2,2}\right)\\ M_{T_{[m,n][i,j]}}^c\left(\mathrm{3,3}\right)\end{array}\right]$

$M_{T[m,n][i,j]}^C\left(\mathrm{1,1}\right)={\mathrm{\&zeta;}}_{\mathrm{rr}}^{[m,n]}(B_{r\_\min }/B_{r\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{rg}}^{[m,n]}(B_{r\_\min }/B_{r\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{rb}}^{[m,n]}\left(B_{r\_\min }{/B}_{r\_[m,n][i,j]}\right)B$

$M_{T[m,n][i,j]}^C\left(\mathrm{2,2}\right)={\mathrm{\&zeta;}}_{\mathrm{gr}}^{[m,n]}(B_{g\_\min }/B_{g\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{gg}}^{[m,n]}(B_{g\_\min }/B_{g\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{gb}}^{[m,n]}\left(B_{g\_\min }{/B}_{g\_[m,n][i,j]}\right)B$

$M_{T[m,n][i,j]}^C\left(\mathrm{3,3}\right)={\mathrm{\&zeta;}}_{\mathrm{br}}^{[m,n]}(B_{b\_\min }/B_{b\_[m,n][i,j]})R+{\mathrm{\&zeta;}}_{\mathrm{bg}}^{[m,n]}(B_{b\_\min }/B_{b\_[m,n][i,j]})G+{\mathrm{\&zeta;}}_{\mathrm{bb}}^{[m,n]}\left(B_{g\_\min }{/B}_{g\_[m,n][i,j]}\right)B$

By said process, make all display pixels of whole display screen demonstrate the basically identical [X of same benchmark colourity spatial color _{Min_[m, n] [i, j]}Y _{Min_[m, n] [i, j]}Z _{Min_[m, n] [i, j]}], its color distortion all, within " color tolerance " scope, reaches the purpose of LED display correction of color uniformity.

The device of realizing the present embodiment method comprises that the red primary input shows that recording controller 1, green primary input show that recording controller 2, blue primary input show recording controller 3, master control logic 4, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rr ^{[m, n]}buffer 5, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rg ^{[m, n]}buffer 6, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rb ^{[m, n]}buffer 7, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gr ^{[m, n]}buffer 8, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gg ^{[m, n]}buffer 9, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gb ^{[m, n]}buffer 10, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _br ^{[m, n]}buffer 11, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _bg ^{[m, n]}buffer 12, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _bb ^{[m, n]}buffer 13, the current red primary brightness correction parameter B that carries out the display pixel of computing _{r_min}/ B _{r_[m, n] [i, j]}buffer 47, the current green primary brightness correction parameter B that carries out the display pixel of computing _{g_min}/ B _{g_[m, n] [i, j]}buffer 48, the current blue primary brightness correction parameter B that carries out the display pixel of computing _{b_min}/ B _{b_[m, n] [i, j]}buffer 49, red primary operational multiplier 14, 15, 16, green primary operational multiplier 17, 18, 19, blue primary operational multiplier 20, 21, 22, red primary computing adder 23, green primary computing adder 24, blue primary computing adder 25, red primary drives and shows data 26, green primary drives and shows data 27, blue primary drives and shows data 28, the red primary input shows data buffer 29, the green primary input shows data buffer 30, the blue primary input shows data buffer 31, the driving that current display pixel red primary has converted shows data buffer 32, the driving that current display pixel green primary has converted shows data buffer 33, the driving that current display pixel blue primary has converted shows data buffer 34, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rr ^{[m, n]}memory 35, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rg ^{[m, n]}memory 36, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rb ^{[m, n]}memory 37, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gr ^{[m, n]}memory 38, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gg ^{m, n]}memory 39, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gb ^{[m, n]}memory 40, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _br ^{[m, n]}memory 41, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _bg ^{[m, n]}memory 42, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _bb ^{[m, n]}memory 43, the red primary brightness correction parameter B of all display pixels of display screen _{r_min}/ B _{r_[m, n] [i, j]}memory 44, the green primary brightness correction parameter B of all display pixels of display screen _{g_min}/ B _{g_[m, n] [i, j]}memory 45, the blue primary brightness correction parameter B of all display pixels of display screen _{b_min}/ B _{b_[m, n] [i, j]}memory 46, brightness pointwise correction multiplier 50 after the multiplying of red primary colourity, the brightness pointwise correction multiplier 51 after the multiplying of green primary colourity, the brightness pointwise correction multiplier 52 after the multiplying of blue primary colourity, the quick-reading flow sheets of controlling is: master control logic 4 produces the basic clock signal of control circuit, red primary input demonstration recording controller 1, green primary input demonstration recording controller 2, blue primary input show continuous each display pixel of input of recording controller 3 each primary colours real time data in this moment, under the signal controlling of master control logic 4, the current chromaticity space transformation parameter matrix element buffer 5,6,7,8,9,10,11,12,13 that carries out the display pixel of computing can be obtained the display pixel chromaticity space transformation parameter matrix element [ξ that this moment needs to participate in computing from corresponding memory 35,36,37,38,39,40,41,42,43 simultaneously _rr ^{[m, n]}ξ _rg ^{[m, n]}ξ _rb ^{[m, n]}ξ _gr ^{[m, n]}ξ _gg ^{[m, n]}ξ _gb ^{[m, n]}ξ _br ^{[m, n]}ξ _bg ^{[m, n]}ξ _bb ^{[m, n]]}current each luminance primary correction parameter buffer 47,48,49 that carries out the display pixel of computing can be obtained the display pixel brightness correction parameter [B that this moment needs to participate in the computing of brightness pointwise correction from corresponding memory 44,45,46 _{r_min}/ B _{r_[m, n] [i, j]}B _{g_min}/ B _{g_[m, n] [i, j]}B _{b_min}/ B _{b_[m, n] [i, j]}], red primary operational multiplier 14,15,16 has been used for the matrix multiplication operation of red primary, green primary operational multiplier 17,18,19 has been used for the matrix multiplication operation of green primary, blue primary operational multiplier 20,21,22 has been used for the matrix multiplication operation of blue primary, red primary computing adder 23 is used for forming the red primary correction demonstration data that respective display pixel has finally converted, green primary computing adder 24 is used for forming the green primary correction demonstration data that respective display pixel has finally converted, blue primary computing adder 25 is used for forming the blue primary correction demonstration data that respective display pixel has finally converted, red primary brightness pointwise correction multiplier 50 is used for the demonstration of the red primary correction after the multiplying of red primary colourity data are carried out to last correction, green primary brightness pointwise correction multiplier 51 is used for the demonstration of the green primary correction after the multiplying of green primary colourity data are carried out to last correction, and blue primary brightness pointwise correction multiplier 52 is used for the demonstration of the blue primary correction after the multiplying of blue primary colourity data are carried out to last correction, red primary shows that data buffer 29 is used for the input of buffer memory red primary and shows that data prepare to carry out computing, green primary shows that data buffer 30 is used for the input of buffer memory green primary and shows that data prepare to carry out computing, blue primary shows that data buffer 31 is used for the input of buffer memory blue primary and shows that data prepare to carry out computing, red primary has converted and has shown that data buffer 32 is used for the buffer memory red primary and drives and show that data prepare output, green primary has converted and has shown that data buffer 33 is used for the buffer memory green primary and drives and show that data prepare output, blue primary has converted and has shown that data buffer 34 is used for the buffer memory blue primary and drives and show that data prepare output.

Each display pixel for each display frame of display screen constantly carries out aforesaid operations, until complete the conversion of the whole pixel datas of a whole frame video image; Carry out same operation at the next frame video image, completed the correction of the full screen light tone degree unification of LED display, guaranteed the demonstration of high-quality video image.

The method is mainly the color distortion between first adjusting module, unifies to control again the brightness situation of each pixel after adjusting color, now owing to not relating to color conversion, proofreaies and correct and becomes relatively easy.Fig. 7 and Fig. 8 provide the calibration result schematic diagram of the method.

In Fig. 7, can see, although there is the difference of pixel intensity, the colourity between module is basically identical.Can see in Fig. 8 that the correction of LED panel display screen colourity module again after the brightness pointwise correction, has reached the purpose of screen homogeneity correction substantially.

The characteristics of the present embodiment method mainly are, the identical aspect with embodiment 1: utilize luminance and chrominance separately-acquiring comparatively fast to obtain effective light tone degree parameter, be directed to any one the pixel [m in each module, n] [i, j] all form the coefficient table of a gamma correction, for any one module [m, n], according to the method for chromaticity correction, form the module chromaticity space transformation parameter matrix; Different is completes the correction of LED display light tone degree uniformity by first colourity by the mode of brightness pointwise correction after the module correction.The brightness correction coefficients of each pixel primary colours of the method is 3 * M * N * I * J memory cell, the chromaticity space transformation parameter matrix unit of each display module have 9 * M * N memory cell, consider i * j>>1, memory space is the same manner as in Example 1, but its control flow is simpler than embodiment 1, be that more effectively the light tone degree separates the scheme of proofreading and correct.In this method, because the display characteristic of LED is unanimous on the whole, so do not relate to the conversion of explicit function aspect in Linear Transformation, still the display characteristic due to LED is not exclusively also linear, so also have in the specific implementation some concrete schemes.

Embodiment 4

Consider that the display characteristic of LED is not exclusively for linear, need to be converted into linear data when advancing the line brightness/chrominance correction carries out real-time operation, also will carry out the output of data after computing sometimes completes, so also need once reverse.

The explicit function characteristic of supposing each primary colours of LED herein, is:

$\left\{\begin{array}{c}{R}_L={\mathrm{\&Phi;}}_R\left(R\right)\\ G_L={\mathrm{\&Phi;}}_G\left(G\right)\\ B_L={\mathrm{\&Phi;}}_B\left(B\right)\end{array}\right.---\left(95\right)$

Wherein [R G B] is that original input shows data, [R _LG _LB _L] be to show the display brightness of the corresponding primary colours of data, [Φ through the input of explicit function conversion _R(R) Φ _G(G) Φ _B(B)] the explicit function of corresponding corresponding primary colours, this explicit function is the corresponding relation function of display data and display brightness, is generally Φ _R(R)=R ^γIndex show, the general range of γ from 1 to 2.8 does not wait, and depending on the concrete condition of display, determines, this point has detailed explanation in patent 03127037.9, just exceeds description herein.If the result after proofreading and correct directly applies to demonstration, do not need reverseization; But sometimes need the LED controller that offers other to use, for the output of data after convenient the correction, suppose

$\left\{\begin{array}{c}{\mathrm{\&psi;}}_R\left(R_L\right)={{\mathrm{\&Phi;}}^{-1}}_R\left(R_L\right)\\ {\mathrm{\&psi;}}_G\left(G_L\right)={{\mathrm{\&Phi;}}^{-1}}_G\left(G_L\right)\\ {\mathrm{\&psi;}}_B\left(B_L\right)={{\mathrm{\&Phi;}}^{-1}}_B\left(B_L\right)\end{array}\right.---\left(96\right)$

For the demonstration inverse function expression formula of each primary colours of LED, wherein [R _LG _LB _L] be the display brightness of corresponding primary colours, [Ф _R ^-1(R _L) Φ _G ^-1(G _L) Ф _B ^-1(B _L)] inverse function of the explicit function of corresponding corresponding primary colours, [ψ _R(R _L) ψ _G(G _L) ψ _B(B _L)] be the reverseization function.

As shown in Figure 9, the first colourity of embodiment 4 is as follows by the course of work of brightness pointwise correction after the module correction:

The same manner as in Example 2, the present embodiment also will show respectively that data buffer and conversion complete the demonstration data buffer and change explicit function converter and reverseization functional converter into, its concise and to the point composition as shown in Figure 9, comprise that the red primary input shows that recording controller 1, green primary input show that recording controller 2, blue primary input show recording controller 3, master control logic 4, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rr ^{[m, n]}buffer 5, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rg ^{[m, n]}buffer 6, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _rb ^{[m, n]}buffer 7, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gr ^{[m, n]}buffer 8, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gg ^{[m, n]}buffer 9, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _gb ^{[m, n]}buffer 10, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _br ^{[m, n]}buffer 11, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _bg ^{[m, n]}buffer 12, the current chromaticity space transformation parameter matrix element ξ that carries out the display pixel of computing _bb ^{[m, n]}buffer 13, the current red primary brightness correction parameter B that carries out the display pixel of computing _{r_min}/ B _{r_[m, n] [i, j]}buffer 47, the current green primary brightness correction parameter B that carries out the display pixel of computing _{g_min}/ B _{g_[m, n] [i, j]}buffer 48, the current blue primary brightness correction parameter B that carries out the display pixel of computing _{b_min}/ B _{b_[m, n] [i, j]}buffer 49, red primary operational multiplier 14, 15, 16, green primary operational multiplier 17, 18, 19, blue primary operational multiplier 20, 21, 22, red primary computing adder 23, green primary computing adder 24, blue primary computing adder 25, red primary drives and shows data 26, green primary drives and shows data 27, blue primary drives and shows data 28, red primary explicit function converter 29 ', green primary explicit function converter 30 ', blue primary explicit function converter 31 ', reverse functional converter 32 after current display pixel red primary has converted ', reverse functional converter 33 after current display pixel green primary has converted ', reverse functional converter 34 after current display pixel blue primary has converted ', the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rr ^{[m, n]}memory 35, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rg ^{[m, n]}memory 36, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _rb ^{[m, n]}memory 37, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gr ^{[m, n]}memory 38, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gg ^{m, n]}memory 39, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _gb ^{[m, n]}memory 40, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _br ^{[m, n]}memory 41, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _bg ^{[m, n]}memory 42, the chromaticity space transformation parameter matrix element ξ of all display modules of display screen _bb ^{[m, n]}memory 43, the red primary brightness correction parameter B of all display pixels of display screen _{r_min}/ B _{r_[m, n] [i, j]}memory 44, the green primary brightness correction parameter B of all display pixels of display screen _{g_min}/ B _{g_[m, n] [i, j]}memory 45, the blue primary brightness correction parameter B of all display pixels of display screen _{b_min}/ B _{b_[m, n] [i, j]}memory 46, brightness pointwise correction multiplier 50 after the multiplying of red primary colourity, the brightness pointwise correction multiplier 51 after the multiplying of green primary colourity, the brightness pointwise correction multiplier 52 after the multiplying of blue primary colourity.

The course of work is: master control logic 4 produces data strobe signal and sends the red primary input to by control line a and shows that recording controller 1, green primary input show that recording controller 2, blue primary input show recording controller 3 in the cycle at each display pixel, make red primary input show data by data wire e input to red primary explicit function converter 29 ', green primary input show data by data wire f input to green primary explicit function converter 30 ', the blue primary input show data by data wire g input to blue primary explicit function converter 31 ', control logic 4 by control line s control red primary explicit function converter 29 ', green primary explicit function converter 30 ' and blue primary explicit function converter 31 ' data are separately converted, make the red primary transform data input to red primary operational multiplier 14 by data wire u, green primary operational multiplier 17, blue primary operational multiplier 20, the green primary transform data inputs to red primary operational multiplier 15 by data wire v, green primary operational multiplier 18, blue primary operational multiplier 21, the blue primary transform data inputs to red primary operational multiplier 16 by data wire w, green primary operational multiplier 19, blue primary operational multiplier 22, meanwhile, control logic 4 produces current display module (display pixel) correction parameter gating signal and sends the chromaticity space transformation parameter matrix element memory 35 of display screen display module by address wire b to, 36, 37, 38, 39, 40, 41, 42, 43, and by data wire h1, i1, j 1, k1, l1, m1, n1, p1, q1 is by the current display pixel chromaticity space transformation parameter matrix element [ξ that needs to participate in computing _rr ^{[m, n]}ξ _rg ^{[m, n]}ξ _rb ^{[m, n]}ξ _gg ^{[m, n]}ξ _gg ^{[m, n]}ξ _gb ^{[m, n]}ξ _br ^{[m, n]}ξ _bg ^{[m, n]}ξ _bb ^{[m, n]}] send the current chromaticity space transformation parameter matrix element buffer 5,6,7,8,9,10,11,12,13 that carries out the display pixel of computing to, make corresponding data send red primary operational multiplier 14,15,16 to by data wire h, i, j, k, l, m, n, p, q, green primary operational multiplier 17,18,19, blue primary operational multiplier 20,21,22.Then control logic 4 produces the computing signal and sends red primary operational multiplier 14,15,16 to by control line c, green primary operational multiplier 17,18,19, blue primary operational multiplier 20,21,22; The intermediate object program produced is sent into red primary computing adder 23, green primary computing adder 24 and blue primary computing adder 25 by data wire r1, r2, r3, g1, g2, g3, b1, b2, b3.Under the control signal effect transmitted by control line d in control logic 4, each primary colours correction that red primary computing adder 23, green primary computing adder 24 and blue primary computing adder 25 produce current display pixel shows data; This correction shows that data send into respectively the brightness pointwise correction multiplier 50 after the multiplying of red primary colourity, the brightness pointwise correction multiplier 51 after the multiplying of green primary colourity and the brightness pointwise correction multiplier 52 after the multiplying of blue primary colourity by rh, gh, bh.Now, control logic 4 produces current display pixel brightness correction parameter gating signal by address wire b ₁send the red primary brightness correction parameter memory 44 of display screen display pixel to, green primary brightness correction parameter memory 45, blue primary brightness correction parameter memory 46, and by data wire B1, B2, B3 sends current each luminance primary correction parameter that participates in computing that needs to the current red primary brightness correction parameter buffer 47 that carries out computing, green primary brightness correction parameter buffer 48, blue primary brightness correction parameter buffer 49, again by data wire B4, B5, B6 is transported to respectively the brightness pointwise correction multiplier 50 after the multiplying of red primary colourity by corresponding bright correction parameter data, brightness pointwise correction multiplier 51 after the multiplying of green primary colourity and the brightness pointwise correction multiplier 52 after the multiplying of blue primary colourity, the signal that control logic 4 produces the brightness pointwise correction passes through y ₂send each luminance primary pointwise correction multiplier 50,51,52 to, produce the correction of a final proof operation result of current each primary colours of display pixel, this operation result pass through rh ', gh ', bh ' send into respectively reverse functional converter 32 after current display pixel red primary has converted ', the reverse functional converter 33 after current display pixel green primary has converted ' and the reverse functional converter 34 of current display pixel blue primary after having converted ', under the control signal effect transmitted by control line y in control logic 4, red primary drive characteristic inverse converter 32 ', the final operation result of green primary drive characteristic inverse converter 33 ' and blue primary drive characteristic inverse converter 34 ' produce.

Each display pixel for each display frame of display screen constantly carries out aforesaid operations, until complete the conversion of the whole pixel datas of a whole frame video image; Carry out same operation at the next frame video image, completed the correction of the full screen light tone degree unification of LED display, guaranteed the demonstration of high-quality video image.

In embodiment 1,2,3,4, determine each primary colours benchmark chromaticity coordinate of whole display screen [x _{R_min}, y _{R_min}, x _{G_min}, y _{G_min}, x _{B_min}, y _{B_min}], and the Benchmark brightness [B of each primary colours _{R_min}, B _{G_min}, B _{B_min}] method as follows:

As shown in Figure 3, indicate that according to the chromaticity coordinate of all display pixels its position is (here because the chromaticity coordinate in module is identical on colorimetric plane figure, the chromaticity coordinate number is not more than 3m * n), can see that the form of expression mainly is divided into 3 groups by the primary colours color, shows the colourity dispersivity of each color inside.For each primary colours in some modules, their chromaticity coordinate is respectively [x _{R_[m, n]}, y _{R_[m, n]}], [x _{G_[m, n]}, y _{G_[m, n]}] and [x _{B_[m, n}, y _{B_[m, n]}], at first connect the linear equation line_rg between red primary and green primary _{[m, n]}, then set up the linear equation line_rb between red primary and blue primary _{[m, n]}, finally set up the linear equation line_gb between green primary and blue primary _{[m, n]}Each primary colours for each module carry out such operation, obtain 3 straight lines bunch, are respectively red green straight line bunch, red blue straight line bunch and turquoise straight line bunch.

Locate the straight intersection point set of shape at red green straight line bunch with red blue straight line bunch, therefrom select the point (redness in figure little square frame) the shortest apart from reference white field chromaticity coordinate distance as red primary benchmark chromaticity coordinate [x _{R_min}, y _{R_min]}]; Locate the straight intersection point set of shape at red green straight line bunch with turquoise straight line bunch, therefrom select the point (green in figure little square frame) the shortest apart from reference white field chromaticity coordinate distance as green primary benchmark chromaticity coordinate [x _{G_min}, y _{G_min]}]; Locate the straight intersection point set of shape at turquoise straight line bunch with red blue straight line bunch, therefrom select the point (blueness in figure little square frame) the shortest apart from reference white field chromaticity coordinate distance as blue primary benchmark chromaticity coordinate [x _{B_min}, y _{B_min]}].

(4) after having determined each primary colours benchmark chromaticity coordinate, then the Benchmark brightness [B of definite each primary colours _{R_min}, B _{G_min}, B _{B_min}], footmark min herein might not mean that the Benchmark brightness of each primary colours is to measure in brightness to choose minimum, and means the primary color space inscribe minimum brightness numerical value that it is the benchmark chrominance space.Patent 03127037.9 describing method has certain omission for the process of choosing of Benchmark brightness, in the present invention, for adopted new method is described, is necessary here to briefly introduce.

For the ij pixel of m n module, show as three primary colours coordinate points on colorimetric plane, chromaticity coordinate is respectively [x _{R_[m, n]}, y _{R_[m, n]}], [x _{G_[m, n]}, y _{G_[m, n]}] and [x _{B_[m, n}, y _{B_[m, n]}], and also show as three coordinate points at chrominance space, be respectively [x _{R_[m, n]}, y _{R_[m, n]}, B _{R_[m, n] [i, j]}], [x _{G_[m, n]}, y _{G_[m, n]}, B _{G_[m, n] [i, j]}] and [x _{B_[m, n]}, y _{B_[m, n]}, B _{B_[m, n] [i, j]}], such spatial point mostly is 3m * n * i * j most, and because the chromaticity coordinate in module is identical, so 3i * j spatial point in module is distributed on 3 straight lines perpendicular to colorimetric plane, such straight line has 3m * n bar.

In step (4), determined red primary benchmark chromaticity coordinate [x _{R_min}, y _{R_min]}]; Green primary benchmark chromaticity coordinate [x _{G_min}, y _{G_min]}]; Blue primary benchmark chromaticity coordinate [x _{B_min}, y _{B_min]}]; Cross this 3 straight lines of doing perpendicular to colorimetric plane, 3 prisms that these 3 straight lines surround are as the basic outer wall of benchmark chrominance space.These 3 straight lines are called benchmark colourity georeferencing line.For the i_j pixel of m_n module, cross three coordinate points [x of its chrominance space _{R_[m, n]}, y _{R_[m, n]}, B _{R_[m, n] [i, j]}], [x _{G_[m, n]}, y _{G_[m, n]}, B _{G_[m, n] [i, j]}] and [x _{B_[m, n}, y _{B_[m, n]}, B _{B_[m, n] [i, j]}], form plane plane_rgb _{[m, n] [i, j]}Such plane has at most m * n * i * j, and there is respectively an intersection point on each plane with 3 benchmark colourity georeferencing lines, and one has 3, and respectively corresponding 3 primary colours, be designated as [x _{R_min}, y _{R_min}, B _{R_[m, n] [i, j] _ min}], [x _{G_min}, y _{G_min}, B _{G_[m, n] [i, j] _ min}] and [x _{B_min}, y _{B_min}, B _{B_[m, n] [i, j] _ min}].

By all plane plane_rgb _{[m, n] [i, j]}Intersect with 3 benchmark colourity georeferencing lines, obtain 3 groups of space coordinates point set, they are distributed on 3 benchmark colourity georeferencing lines, are characterised in that the brightness number difference, are respectively [B _{R_[m, n] [i, j] _ min}], [B _{G_[m, n] [i, j] _ min}] and [B _{B_[m, n] [i, j] _ min}]; At space coordinates point set [x _{R_min}, y _{R_min}, B _{R_[m, n] [i, j] _ min}] in choose [B _{R_[m, n] [i, j] _ min}] minimum chrominance space point is as red primary benchmark colourity spatial point, is designated as [x _{R_min}, y _{R_min}, B _{R_min}]; At space coordinates point set [x _{G_min}, y _{G_min}, B _{G_[m, n] [i, j] _ min}] in choose [B _{G_[m, n] [i, j] _ min}] minimum chrominance space point is as green primary benchmark colourity spatial point, is designated as [x _{G_min}, y _{G_min}, B _{G_min}]; At space coordinates point set [x _{B_min}, y _{B_min}, B _{B_[m, n] [i, j] _ min}] in choose [B _{B_[m, n] [i, j] _ min}] minimum chrominance space point is as blue primary benchmark colourity spatial point, is designated as [x _{B_min}, y _{B_min}, B _{B_min}].

Claims (4)

1. a LED display uniformity correcting method for separating brightness and chromaticity, is characterized in that comprising the steps:

1) " x _{R_[m, n]}, y _{R_[m, n]}, z _{R_[m, n]}For the red primary chromaticity coordinate of m_n module, x _{G_[m, n]}, y _{G_[m, n]}, z _{G_[m, n]}For the green primary chromaticity coordinate of m_n module, x _{B_[m, n]}, y _{B_[m, n]}, z _{B_[m, n]}The blue primary chromaticity coordinate of m_n module; Each pixel colorimetric parameter in the set and display module all equates, for the i_j pixel of m_n module wherein, i.e. pixel [m, n] [i, j] has:

Wherein m, n are respectively the capable ordinal sum row ordinal number of the display module at pixel place, and i, j are respectively the capable ordinal sum row ordinal number at pixel place in display module; Utilize light tone degree detector to obtain the red primary colorimetric parameter x of arbitrary pixel in LED display m_n module _{R_[m, n] [i, j]}, y _{R_[m, n] [i, j]}, green primary colorimetric parameter x _{G_[m, n] [i, j]}, y _{G_[m, n] [i, j]}, blue primary colorimetric parameter x _{B_[m, n] [i, j]}, y _{B_[m, n] [i, j]}Red primary chromaticity coordinate x as the m_n module _{R_[m, n]}, y _{R_[m, n]}, green primary chromaticity coordinate x _{G_[m, n]}, y _{G_[m, n]}, blue primary chromaticity coordinate x _{B_[m, n]}, y _{B_[m, n]}

Each display pixel on display screen is carried out to the brightness collection; Obtain the luminance parameter [B of each display pixel _{R_[m, n] [i, j]}, B _{G_[m, n] [i, j]}, B _{B_[m, n] [i, j]}];

2) determine the minimal color triangle coverage that on display screen, the chromaticity coordinate of all display pixels surrounds, the red primary chromaticity coordinate [x on this leg-of-mutton each summit of minimal color _{R_min}, y _{R_min}], green primary chromaticity coordinate [x _{G_min}, y _{G_min}], blue primary chromaticity coordinate [x _{B_min}, y _{B_min}] be each primary colours benchmark chromaticity coordinate of whole display screen;

Determine the Benchmark brightness [B of red, green, blue three primary colors _{R_min}, B _{G_min}, B _{B_min}], i.e. the primary color space inscribe minimum brightness numerical value of benchmark chrominance space;

3) parameter of YC is done to separation, be directed to the coefficient table that any one pixel [m, n] [i, j] in each module all forms a gamma correction

K wherein _{Pix_[m, n] [i, j]}Brightness correction coefficients for pixel [m, n] [i, j]; k ₁, k ₂, k ₃Be respectively the red, green, blue brightness correction coefficients of pixel [m, n] [i, j];

4), for any one m_n module, form the module chromaticity space transformation parameter matrix

Wherein the every element of matrix is

Z _{r_min}＝1-x _{r_min}-y _{r_min}；Z _{g_min}＝1-x _{g_min}-y _{g_min}；Z _{b_min}＝1-x _{b_min}-y _{b_min}；

5) utilize step 3) brightness correction coefficients table and step 4) the Real Time Drive of module chromaticity space transformation parameter matrix after being proofreaied and correct show data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}]:

Wherein R, G, B are respectively red, green, blue input demonstration data;

6) utilize step 5) Real Time Drive after the correction that obtains shows data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}] the driving display screen.

2. LED display uniformity correcting method for separating brightness and chromaticity according to claim 1, it is characterized in that described step 5) in, utilize step 3) brightness correction coefficients table and step 4) the Real Time Drive of module chromaticity space transformation parameter matrix after being proofreaied and correct show data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}] method as follows:

At first utilizing step 3) the brightness correction coefficients table that obtains revised the brightness of each pixel of display screen, the brightness number M after being proofreaied and correct _{T[m, n] [i, j]}:

Then utilize the brightness number M after proofreading and correct _{T[m, n] [i, j]}And step 4) the module chromaticity space transformation parameter matrix obtained obtains the chromaticity space transformation parameter matrix of each pixel of display screen:

Finally utilize each pixel chromaticity space transformation parameter matrix to complete the Color correction of modules, the Real Time Drive obtained after each pixel correction shows data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}]:

3. LED display uniformity correcting method for separating brightness and chromaticity according to claim 1, it is characterized in that described step 5) in, utilize step 3) brightness correction coefficients table and step 4) the Real Time Drive of module chromaticity space transformation parameter matrix after being proofreaied and correct show data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}] method adopt following steps:

At first utilize the module chromaticity space transformation parameter matrix to carry out Color correction to the display screen modules, obtain revised demonstration data [R _{[m, n]}, G _{[m, n]}, B _{[m, n]}]:

Then utilize step 3) the brightness correction coefficients table that obtains and revise and show data [R _{[m, n]}, G _{[m, n]}, B _{[m, n]}] completing the correction of each pixel intensity, the Real Time Drive obtained after each pixel correction of display screen shows data [R _{[m, n] [i, j]}G _{[m, n] [i, j]}B _{[m, n] [i, j]}];

4. LED display uniformity correcting method for separating brightness and chromaticity according to claim 1, is characterized in that described step 2) in determine that the step of each primary colours benchmark chromaticity coordinate of display screen is as follows:

A, according to the chromaticity coordinate [x of each display pixel _{R_[m, n]}, y _{R_[m, n]}], [x _{G_[m, n]}, y _{G_[m, n]}] and [x _{B_[m, n]}, y _{B_[m, n]}], indicate its position on colorimetric plane figure;

B, set up the linear equation line_rg between red primary and green primary _{[m, n]}, the linear equation line_rb between red primary and blue primary _{[m, n]}, the linear equation line_gb between green primary and blue primary _{[m, n]}Obtain 3 straight lines bunch, be respectively red green straight line bunch, red blue straight line bunch and turquoise straight line bunch;

C, at red green straight line bunch and red blue straight line bunch, locate the straight intersection point set of shape, therefrom select apart from reference white field chromaticity coordinate [x _w, y _w] the shortest point of distance is as red primary benchmark chromaticity coordinate [x _{R_min}, y _{R_min]}]; Locate the straight intersection point set of shape at red green straight line bunch with turquoise straight line bunch, therefrom select apart from reference white field chromaticity coordinate [x _w, y _w] the shortest point of distance is as green primary benchmark chromaticity coordinate [x _{G_min}, y _{G_min]}]; Locate the straight intersection point set of shape at turquoise straight line bunch with red blue straight line bunch, therefrom select apart from reference white field chromaticity coordinate [x _w, y _w] the shortest point of distance is as blue primary benchmark chromaticity coordinate [x _{B_min}, y _{B_min]}];

Determine the Benchmark brightness [B of each primary colours _{R_min}, B _{G_min}, B _{B_min}] concrete steps as follows:

A, mistake red primary benchmark chromaticity coordinate [x _{R_min}, y _{R_min]}] point, the green primary benchmark chromaticity coordinate [x at place _{G_min}, y _{G_min]}] point and the blue primary benchmark chromaticity coordinate [x at place _{B_min}, y _{B_min]}] point at place does the straight line perpendicular to colorimetric plane, usings these 3 straight lines as benchmark colourity georeferencing line;

B, each pixel colourity space coordinates point [x _{R_[m, n]}, y _{R_[m, n]}, B _{R_[m, n] [i, j]}], [x _{G_[m, n]}, y _{G_[m, n]}, B _{G_[m, n] [i, j]}] and [x _{B_[m, n]}, y _{B_[m, n]}, B _{B_[m, n] [i, j]}] the plane plane_rgb that forms _{[m, n] [i, j]}Intersect with 3 benchmark colourity georeferencing lines, obtain 3 groups of space coordinates point set, they are distributed on 3 benchmark colourity georeferencing lines, and brightness number is respectively [B _{R_[m, n] [i, j] _ min}], [B _{G_[m, n] [i, j] _ min}] and [B _{B_[m, n] [i, j] _ min}]; At space coordinates point set [x _{R_min}, y _{R_min}, B _{R_[m, n] [i, j] _ min}] in choose [B _{R_[m, n] [i, j] _ min}] minimum chrominance space point, the Benchmark brightness B using the brightness of this spatial point as red primary _{R_min}At space coordinates point set [x _{G_min}, y _{G_min}, B _{G_[m, n] [i, j] _ min}] in choose [B _{G_[m, n] [i, j] _ min}] minimum chrominance space point, the Benchmark brightness B using the brightness of this spatial point as green primary _{G_min}At space coordinates point set [x _{B_min}, y _{B_min}, B _{B_[m, n] [i, j] _ min}] in choose [B _{B_[m, n] [i, j] _ min}] minimum chrominance space point, the Benchmark brightness B using the brightness of this spatial point as blue primary _{B_min}.

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