CN101908329A - Generation method and display device of tone characteristic look-up table - Google Patents

Abstract

The invention discloses a generation method and a display device of a tone characteristic look-up table. The generation method of the tone characteristic look-up table (LUT) comprises the following steps: solving for the display characteristics of multiple colors by utilizing a nonlinear interpolation algorithm based on the display characteristics of multiple specific patterns, wherein the number of the specific patterns is smaller than the product of the number of the colors and the number of the display characteristics of the colors; and modifying the display characteristics of the colors to generate one tone characteristic look-up table according to the maximum display characteristic value of the display characteristics of the colors and a target tone characteristic value. In addition, the specific patterns comprise multiple gray scale patterns which correspond to multiple orders in a one-to-one mode, and the order interval of a pair of adjacent gray scale patterns in the gray scale patterns is different from that of anther pair of adjacent gray scale patterns.

Description

Tone characteristic look-up table production method and display device

Technical field

The present invention relates to a kind of tone characteristic look-up table production method and use its display device, relate in particular to tone characteristic look-up table production method that uses the non-linear interpolation algorithm and the display device of using it.

Background technology

For promoting the quality of the shown image of display device, generally in display device, the picture signal of its input is carried out gradating properties correction (Gamma Correction/Calibration).Fig. 1 shows known synoptic diagram with display device of gradating properties debugging functions.Known display device 10 comprises a storer 12, a scaler (scaler) 13 and a display panel 14.Storer 12 can be an electric EEPROM (EEPROM), and stores a contrast characteristic look-up table (GammaLUT (look-up table)).Scaler 13 receives a picture signal S1, and read tone characteristic look-up table from storer 12, the data correction picture signal S1 that provides according to this tone characteristic look-up table revises back picture signal S2 to produce again, shows the image of corresponding this picture signal S1 for display panel 14.

When actual volume production, mass-produced display panel 14 can use same tone characteristic look-up table, yet 14 of display panels can occur again inevitably because of the difference that processing procedure produced, so can produce the problem of unsuitable gradating properties correction, cause correction result worse, when serious, there is the bad abnormal occurrence of GTG colour cast to occur.

Summary of the invention

The purpose of one embodiment of the invention is to provide a kind of tone characteristic look-up table production method, to solve the above-mentioned known situation that is suffered from.

Tone characteristic look-up table production method according to one embodiment of the invention comprises: the display characteristic that receives a plurality of specific patterns; According to the display characteristic of these specific patterns and utilize a non-linear interpolation algorithm to obtain the display characteristic of a plurality of colors, wherein the quantity of these specific patterns is less than the product of the quantity of the display characteristic of the quantity of these colors and these colors; And according to a maximum display characteristic value and a target gradating properties value of the display characteristic of these colors, the display characteristic of revising these colors is to produce a contrast characteristic look-up table.And these specific patterns comprise a plurality of grey scale pattern and these grey scale pattern in man-to-man mode corresponding to a plurality of exponent numbers, and the exponent number of a pair of adjacent grey scale pattern is different from another to the exponent number of adjacent grey scale pattern at interval at interval in these grey scale pattern.Preferably in one embodiment, should be in these grey scale pattern to the exponent number of adjacent grey scale pattern less than another exponent number to adjacent grey scale pattern, and should be to rank between the exponent number of adjacent grey scale pattern less than another to the exponent number of adjacent grey scale pattern at interval in these grey scale pattern.

Display device according to another embodiment of the present invention comprises a storer and a graphics processing unit.Memory stores one contrast characteristic look-up table, and tone characteristic look-up table is the display characteristic that utilizes a plurality of specific patterns, produced with a non-linear interpolation algorithm, wherein these specific patterns comprise a plurality of grey scale pattern and these grey scale pattern in man-to-man mode corresponding to a plurality of exponent numbers, and the exponent number of a pair of adjacent grey scale pattern is different from another to the exponent number of adjacent grey scale pattern at interval at interval in these grey scale pattern.Graphics processing unit receives a picture signal, and reads tone characteristic look-up table from storer, again according to tone characteristic look-up table correction image signal, produces once picture signal to a display panel of revising.

Display device according to another embodiment of the present invention comprises a display panel (panel), a storer and a graphics processing unit.The display characteristic of a plurality of specific patterns of memory stores, and the display characteristic of these specific patterns is corresponding to display panel, and these specific patterns comprise a plurality of grey scale pattern and these grey scale pattern in man-to-man mode corresponding to a plurality of exponent numbers, and the exponent number of a pair of adjacent grey scale pattern is different from another to the exponent number of adjacent grey scale pattern at interval at interval in these grey scale pattern.Graphics processing unit receives a picture signal, reads the display characteristic of these specific patterns from storer, according to the display characteristic correction image signal of these specific patterns, and exports revised picture signal to display panel.

Other purposes of the present invention and advantage can be further understood from technical characterictic disclosed in this invention.For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, embodiment cited below particularly and conjunction with figs. are described in detail as follows.

Description of drawings

Fig. 1 shows known synoptic diagram with display device of gradating properties debugging functions.

Fig. 2 shows the Organization Chart in order to the display characteristic of measuring a display device of one embodiment of the invention.

Fig. 3 shows the process flow diagram of the tone characteristic look-up table production method of one embodiment of the invention.

Fig. 4 shows that the GTG of a display device and the curve of briliancy reach according to the GTG of the selected grey scale pattern of one embodiment of the invention and the corresponding point position of briliancy.

Fig. 5 shows with hardware to come display characteristic is carried out the functional block diagram that colour temperature control is revised.

[main element symbol description]

10 display device, 113 scaler

12 storeies, 114 display panels

13 scaler, 115 microprocessors

14 display panels, 131 main frames

100 display device, 121 color analysis dress

Put

112 memory I pu Flame Image Process are single

Unit

Embodiment

About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of following cooperation embodiment with reference to the accompanying drawings, can clearly present.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are the directions with reference to annexed drawings.Therefore, the direction term of use is to be used for illustrating not to be to be used for limiting the present invention.

Fig. 2 shows the synoptic diagram of the measurement system of one embodiment of the invention.This measurement system includes a color analysis device 121, a main frame 131 and at least one tested display device 100.Measurement system is in order to measure the display characteristic of display device 100.

Display device 100 comprises a storer 112, a graphics processing unit Ipu, reaches a display panel 114.Wherein, graphics processing unit Ipu comprises a scaler 113 and a microprocessor (MCU) 115.Please refer to Fig. 2, at test display apparatus 100 when obtaining its display characteristic, this measurement system utilizes the application program of main frame 131 by the control to graphics processing unit Ipu, make display panel 114 produce different y specific pattern (pattern) pictures, and utilize color analysis device 121 to measure the display characteristic of this display panel 114.

One embodiment, above-mentioned y can be the positive integer less than 768.And main frame 131 can be computing machine.Color analysis device 121 can use instrument or other the instrument with close function of commercially available model as Konica Mei Leda (Konica-Minolta) CA-210 model.The display characteristic data of these y specific pattern of display panel 114 can be briliancy or chroma data; Or the combination of these performance datas.

In one embodiment of the invention, after the display characteristic data of these y specific pattern that main frame 131 reception color analysis devices 121 are measured, just the tone characteristic look-up table production method produces tone characteristic look-up table according to an embodiment of the invention.The tone characteristic look-up table that main frame 131 will be produced by the tone characteristic look-up table production method of one embodiment of the invention by microprocessor 115 is stored in the storer 112 of display device 100.

Then, display device 100 is when operation, graphics processing unit Ipu receives a picture signal Si, and read the tone characteristic look-up table that the tone characteristic look-up table production method of one embodiment of the invention is produced from storer 112, again according to this tone characteristic look-up table correction image signal Si, revise back picture signal So to display panel 114 to produce one, show the image of corresponding these picture signals for display panel 114.

And in another embodiment of the present invention, after main frame 131 receives the display characteristic data of these y specific pattern that color analysis devices 121 are measured, by microprocessor 115 with the display characteristic data storage of y specific pattern in the storer 112 of display device 100.Display device 100 is when operation, the scaler 113 of graphics processing unit Ipu reads the display characteristic data of these y specific pattern in the storer 112, and produce a contrast characteristic look-up table according to the tone characteristic look-up table production method of one embodiment of the invention, receive a picture signal Si, again according to this tone characteristic look-up table correction image signal Si, produce and revise back picture signal So, show the image of corresponding this picture signal for display panel 114.

In another embodiment of the present invention, after main frame 131 receives the display characteristic data of these y specific pattern that color analysis devices 121 are measured, just directly transfer to microprocessor 115 with the display characteristic data storage of these y specific pattern in storer 112.When main frame 131 is assigned a corrected signal to microprocessor 115, scaler 113 is followed the commander of microprocessor 115, from data-carrier store 112, receive the display characteristic data of these y specific pattern, an and contrast characteristic look-up table that produces according to tone characteristic look-up table production method of the present invention, at last, be stored in again in the scaler 113.When display device 100 in when operation, the scaler 113 of graphics processing unit Ipu receives a picture signal Si, and directly according to this tone characteristic look-up table correction image signal Si, and produce correction back picture signal So, for image after the correction of corresponding these picture signals of display panel 114 demonstrations.

Fig. 3 shows the tone characteristic look-up table production method of one embodiment of the invention, and the method includes the steps of:

Step S02: receive the display characteristic of y specific pattern, wherein y is a positive integer.Preferably y is the positive integer less than 768.

Step S04: according to the display characteristic of these y specific pattern and utilize a non-linear interpolation algorithm to obtain m display characteristic of x color, wherein x and m are positive integer; And y takes advantage of in x less than m.

Step S06: according to a maximum display characteristic value (Lvmax) and a target gradating properties (gamma) value, m display characteristic revising these x color is to produce tone characteristic look-up table.In one embodiment, can also be again according to a target color temperature value (D), m display characteristic revising these x color again is to produce tone characteristic look-up table.

Can utilize the briliancy of specific pattern and chroma to try to achieve tone characteristic look-up table in one embodiment.In addition, the display characteristic of these specific patterns among the step S02 can comprise the briliancy of a Pn rank grey scale pattern, wherein n=0～21.Generally speaking, the GTG color of display device is by red, green and blue formation, for obtaining preferable contrast correction effect, the display characteristic of these specific patterns of present embodiment can also comprise the chroma of a whole red pattern, a complete green pattern and a complete blue pattern.

More specifically, adopting Pn in the present embodiment is that 22 grey scale pattern such as 0,4,8,16,24,32,40,48,56,64,80,96,112,128,144,160,176,192,208,224,240,255 rank are as specific pattern; And adopt 3 complete red, complete green and complete blue patterns as specific pattern, that is present embodiment adopts 25 specific patterns (y is 25).Here, because human eye can be sharp for darker picture, therefore, for darker grey scale pattern, select as specific pattern in more closely-spaced mode, and, select as specific pattern in mode than large-spacing for brighter grey scale pattern, as the interval of above-mentioned illustrated 22 grey scale pattern, be respectively 4,4,8,8,8,8,8,8,8,16,16,16,16,16,16,16,16,16,16,16,15 between in twos.In addition, its interval size can be and has regularity or have not regulation (as: form at random).In addition, because each grey scale pattern cording has different GTG value (gray level), its relation is just as being both a kind of enantiomorphic relationship of (one-to-one) one to one.As the interval of above-mentioned 22 grey scale pattern, the exponent number of a pair of adjacent grey scale pattern is different from another exponent number interval to adjacent grey scale pattern at interval in these grey scale pattern.Interval in these grey scale pattern of the foregoing description between two adjacent grey scale pattern includes 4,8,16 and 15.And preferably.In these grey scale pattern should to the exponent number of adjacent grey scale pattern less than this another to the exponent number of adjacent grey scale pattern, and in these grey scale pattern should to rank between the exponent number of adjacent grey scale pattern less than this another to the exponent number of adjacent grey scale pattern at interval.

Fig. 4 shows the curve of the GTG of a display device and briliancy and according to the synoptic diagram of the corresponding point position of the GTG of the selected grey scale pattern of one embodiment of the invention and briliancy.As shown in Figure 4, according to the speciality of gradating properties curve, error is excessive later to avoid interpolation to need interpolation more meticulously at low order, so selected pattern in the present embodiment, as mentioned above, Pn is interval (0～8 in above-mentioned) with 4 when lower-order; Pn is interval (8～64 in above-mentioned) with 8 during high-order slightly; Pn more high-order is interval (64～240 in above-mentioned) with 16.

When the briliancy of these specific patterns comprises the briliancy of a plurality of grey scale pattern, and with red, green and blue when producing this GTG color, among above-mentioned Fig. 3 step S04 can comprise with the following step (a) with (b).

Step (a): the briliancy component of obtaining the redness (R) of each 22 grey scale pattern, green (G) and blue (B) according to the briliancy of each 22 grey scale pattern.Below illustrate in greater detail the method for trying to achieve the briliancy component.

At first, according to CIE1931 tristimulus values principle, the tristimulus values of GTG can equate with its R/G/B component tristimulus values summation, as shown in the formula (1):

X _Gray＝X _R+X _G+X _B，

Y _Gray＝Y _R+Y _G+Y _B，

Z _Gray＝Z _R+Z _G+Z _B，(1)

Then, if know the corresponding R/G/B of GTG chromaticity coordinates (xr, yr), (xg, yg), (xb yb) can be represented XR and ZR by formula (2) by YR; XG and ZG are represented by YG; XB and ZB are represented by YB, can get:

x∶y∶(1-x-y)＝X∶Y∶Z，(2)

Therefore YR, YG and the YB of any single order can try to achieve via (3), (4) formula and XGray, YGray, ZGray, as shown in the formula (3):

$\left[\begin{array}{ccc}{X}_{\mathrm{Gray}}& Y_{\mathrm{Gray}}& Z_{\mathrm{Gray}}\end{array}\right]=\left[\begin{array}{ccc}{Y}_R& Y_G& Y_B\end{array}\right]\&times;\left[\begin{array}{ccc}\frac{x_r}{y_{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="H2009101460035E0000041.png"\; state="\{\{state\}\}">r</figure-callout>}}}& 1& \frac{1-x_r-y_r}{y_r}\\ \frac{x_g}{y_{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101460035E0000041.png"\; state="\{\{state\}\}">g</figure-callout>}}}& 1& \frac{1-x_g-y_g}{y_g}\\ \frac{x_b}{y_b}& 1& \frac{1-x_b-y_b}{y_b}\end{array}\right]---\left(3\right)$

Therefore just can obtain following formula (4):

[Y _R?Y _G?Y _B]＝[X _Gray?Y _Gray?Z _Gray]×M _GraytoRGB，

${\mathrm{whereM}}_{\mathrm{GraytoRGB}}={\left[\begin{array}{ccc}\frac{x_{\mathrm{<figure-callout\; id="1"\; label="r\; y\; r"\; filenames="H2009101460035E0000041.png"\; state="\{\{state\}\}">r</figure-callout>}}}{y_r}& 1& \frac{1-x_r-y_r}{y_r}\\ \frac{x_g}{y_{\mathrm{<figure-callout\; id="1"\; label="g"\; filenames="H2009101460035E0000041.png"\; state="\{\{state\}\}">g</figure-callout>}}}& 1& \frac{1-x_g-y_g}{y_g}\\ \frac{x_b}{y_b}& 1& \frac{1-x_b-y_b}{y_b}\end{array}\right]}^{-1},---\left(4\right)$

Wherein, according to the specific pattern of display panel red entirely/complete blue/complete green chroma characteristic tries to achieve chroma display characteristic matrix M _GraytoRGB, this chroma display characteristic matrix M is all used on each rank _GraytoRGB, again according to the briliancy component of the briliancy of the grey scale pattern on each rank and the redness (R) that chroma is obtained each grey scale pattern, green (G) and blue (B).

And then the briliancy component of the redness (R) of each grey scale pattern of briliancy correction of the light leak during with zeroth order (black), green (G) and blue (B).Because display panel 114 still has the problem of black light leak at present, promptly each color R/G/B passage (channel) of display panel 114 still has light to spill from each color R/G/B passage when closing.Have error if employing formula (4) is estimated the briliancy stool and urine of R/G/B component, add the correction formula of following part in the estimation algorithm of one embodiment of the invention, as follows:

[K _R?K _G?K _B]＝[X _K?Y _K?Z _K]×M _GraytoRGB，(5)

Light leak when wherein KR, KG, KB represent R/G/B passage contract fully situation, that is the briliancy of the light leak during GTG zeroth order (black) are revised each rank R/G/B component intensity Y later _R, Y _G, Y _BFor as shown in the formula:

Y′ _R＝Y _R+K _B+K _G，

Y′ _G＝Y _G+K _R+K _B，

Y′ _B＝Y _B+K _R+K _G，

Y′ _KR＝Y′ _KG＝Y′ _KB＝Y _K，(6)

Y wherein _K/ Y ' _KR/ Y ' _KG/ ' Y _KBGrey when representing the GTG zeroth order respectively, redness, green and blue briliancy.

Step (b): the briliancy component according to 3 colors of the redness (R) of these 22 grey scale pattern, green (G) and blue (B), utilize a non-linear interpolation algorithm to obtain the briliancy component on GTG 256 rank of these 3 colors respectively.Below, with reference to Fig. 4, be the method that example explains the briliancy component of trying to achieve these each rank of color with a color.

Briliancy component according to one of them color of above-mentioned 22 grey scale pattern, obtain the briliancy component variation rate (following represent) on these color two adjacent each rank (22 rank) with Lv_Slope, can obtain 21 rank (22 rank, two adjacent each rank mid point, promptly be the mean value of getting two adjacent rank) briliancy component variation rate, therefore, these 21 rank are defined as SPn, n=0～20.Wherein, SPn is 2,6,12,20,28,36,44,52,60,72,88,104,120,136,152,168,184,200,216,232,248.Here, similarly be SP ₂₁Be point among 240 and 255, the resulting numerical value of strict calculating should be 247.5, but because human eye is not sharper for brighter picture, so, use rounding-off method that 247.5 integers are turned to 248.But, this only says as example, is not in order to restriction the present invention.Simultaneously, also calculate the briliancy component variation rate of these 21 rank SPn.The briliancy component variation rate of these 21 rank SPn, poor by the briliancy component that each rank is adjacent between rank, divided by the difference of the digital code of the GTG of this two GTGs correspondence and get; Its relation meets the formula (7) shown in following:

Lv_Slope[SP _n]＝(Lv[P _n+1]-Lv[P _n])/(Code[P _n+1]-Code[P _n])，

Code[SP _n]＝round((P _n+1+P _n)/2)，n＝0～20，(7)

Wherein, Lv[Pn] the briliancy component (Lv) on expression n rank; Code[Pn] with Code[SPn] represent the gray level digital code (digital code (Code)) of corresponding Pn and SPn respectively; Lv_Slope[SPn] represent the briliancy component variation rate on n rank; And round () function is the function that rounds up.

To comprise the slope variation rate of the redness that makes two adjacent these grey scale pattern, green and blue briliancy component be linear change to the non-linear interpolation algorithm in the present embodiment.In detail, suppose that the slope between these 21 rank is a linear change, that is hypothesis slope variation rate for etc. rate of change, the rate of change that just can utilize linear interpolation and extrapolation to obtain the briliancy component on 256 rank distributes, Lv_Slope[Digital_Code], Digital_Code=0～255, as following formula (8):

Lv_Slpoe[Digital_Code]＝Lv_Slope[SP _n]+(SlopeRate)×(Coide-Code[SP _n])，

SlopeRate＝(Lv_Slope[SP _n+1]-Lv_Slope[SP _n])/(Code[SP _n+1]-Code[SP _n])，

where?Code[SP _n+1]＞Code＞Code[Sp _n]. (8)

Moreover the briliancy component on each rank, former 22 rank of can arranging in pairs or groups is obtained the briliancy component on each rank, 256 rank, shown in following formula (9):

P _n＜Digital_Code＜P _n+1；

Lv[Digital_Code]＝Lv[P _n]+Lv_Slope[P _n]，Digital_Code＝Code[P _n]+1；

Lv[Digital_Code]＝Lv[Digital_Code-1]+Lv_Slope[Digital_Code-1]，

Digital_Code＞(Code[P _n]+1)；

(9)

In the present embodiment, the m of a step S06 display characteristic can be 256 briliancy.Each rank briliancy Lv (Digital_Code), maximum display characteristic value (Lv _Max) and target gradating properties (Gamma) be to meet following formula (10), revise 256 briliancy of these 3 colors.

$\mathrm{Lv}(\mathrm{Digital}\_\mathrm{Code})={\mathrm{Lv}}_{\max }\&times;{\left(\frac{\mathrm{Digital}\_\mathrm{Code}}{255}\right)}^{\mathrm{Gamma}},---\left(10\right)$

Because display panel 114 has restriction physically when the most black, calculate the target gradating properties curve of trying to achieve (Gamma curve) according to this formula (10), the most black value that the briliancy Lv of its lower-order place value all can be produced much smaller than display panel 114, thereby can cause parameter unusual of the tone characteristic look-up table (Gamma LUT) that the lower-order zone obtains, and make the low order portion of having revised the back GTG have to be all and deceive entirely or because of the excessive problem that causes colour cast of the tone characteristic look-up table difference of each R/G/B.Therefore in an embodiment, can re-use formula (11) and revise:

$\mathrm{Lv}(\mathrm{Digital}\_\mathrm{Code})={\mathrm{Lv}}_{\max }\&times;{\left(\frac{\mathrm{Digital}\_\mathrm{Code}}{255}\right)}^{\mathrm{Gamma}}+\mathrm{Lv}\_\mathrm{Black},---\left(11\right)$

Brightness value when wherein Lv_black represents that display panel 114 is the most black.

Tone characteristic look-up table production method according to another embodiment of the present invention comprises following steps S06, can comprise a step S62.

Step S62: again according to a target color temperature value (D), m display characteristic revising these x color again is to produce tone characteristic look-up table.M display characteristic to these x color more carries out colour temperature control correction by this, and what colour temperature control was revised is described in detail as follows.

At first, the target color temperature value can be for by the measured target colour temperature tristimulus values of color analysis device 121.By target colour temperature tristimulus values, present embodiment is that example (is X with D65 _D65, Y _D65, Z _D65), obtain corresponding R/G/B component intensity Y according to formula (4) _{R_D65}, Y _{G_D65}, Y _{B_D65}, then utilize and the bright spot R/G/B component (Y of display panel 114 _{R_White}, Y _{G_White}, Y _{B_White}) ratio and formula (12) obtain R _Ratio, G _Ratio, B _Ratio, as follows:

R _ratio＝C _ratio×Y _{R_D65}/Y _{R_White}

G _ratio＝C _ratio×Y _{G_D65}/Y _{G_White}

B _ratio＝C _ratio×Y _{B_D65}/Y _{B_White}

C _ratio＝1/max(Y _{R_D65}/Y _{R_White}，Y _{G_D65}/Y _{G_White}，Y _{B_D65}/Y _{B_White})，(12)

Wherein max () gets peaked function.

In one embodiment, can utilize scaler 113 directly to carry out computing and try to achieve each parameter in the tone characteristic look-up table with following formula.

$\mathrm{Lv}(\mathrm{Digital}\_\mathrm{Code})=R_{\mathrm{ratio}}\left(\mathrm{or}{G}_{\mathrm{ratio}}\mathrm{or}{B}_{\mathrm{ratio}}\right)\&times;{\mathrm{Lv}}_{\max }\&times;{\left(\frac{\mathrm{Digital}\_\mathrm{Code}}{255}\right)}^{\mathrm{Gamma}}+\mathrm{Lv}\_\mathrm{Black},---\left(13\right)$

Brightness value when wherein Lv_black represents that display panel 114 is the most black.

Fig. 5 shows with hardware to come display characteristic is carried out the functional block diagram that colour temperature control is revised.Please refer to Fig. 5, also can utilize hardware to come that these display characteristics are carried out colour temperature control in another embodiment and revise.When trying to achieve display panel 114 when not carrying out colour temperature control and revising and carried out the tone characteristic look-up table that target gradating properties (is 2.2 as gamma) revises, can be according to the R that tries to achieve _Ratio, G _Ratio, B _RatioObtain R ' according to formula (14) _Ratio, G ' _Ratio, B ' _Ratio, and realize that with the framework of Fig. 4 colour temperature control revises, this moment, contrast (Gamma) characteristic was constant.

R′ _ratio＝R _ratio ^1/gamma；

G′ _ratio＝G _ratio ^1/gamma；

B′ _ratio＝B _ratio ^1/gamma；(14)

In sum,, provide three kinds of modes, upgrade the tone characteristic look-up table that the tone characteristic look-up table production method according to one embodiment of the invention is produced according to the display device 100 of one embodiment of the invention.Therefore according to the display device 100 of one embodiment of the invention, the system manufacturer of display device need not utilize and recompilate firmware (F/W), again with firmware burning on display device, just can be immediately and the tone characteristic look-up table on the update displayed device for good and all.Above-mentioned dual mode is described in detail as follows:

(a) after main frame 131 calculates and obtains the gradating properties corrected parameter of a plurality of correspondences, produce a contrast characteristic look-up table, this tone characteristic look-up table is stored in the storer 112 of display device 100, then, can send specific order or make display device 100 reopening machines by main frame 131, tone characteristic look-up table be read and write into by storer 112 in the register of scaler 113 for scaler 113 uses to trigger corresponding firmware.

(b) main frame 131 deposits into the display characteristic data (for example being 22x3 briliancy characteristic and 21x3 luminance variations rate characteristic) of display panel 114 storer 112 of display device 100, then can send specific order or make display device 100 reopening machines by main frame 131 to trigger corresponding firmware (F/W), the display characteristic data of display panel 114 are read, and the special domestic animal corrected parameter of the contrast of obtaining a plurality of correspondences, produce a contrast characteristic look-up table, at last tone characteristic look-up table is write in the register of scaler 113 and use for scaler 113.

(c) after main frame 131 receives the display characteristic data (as: briliancy, chroma) of color analysis device 121 with specific pattern measurement display panel 114 gained, directly send firmware (F/W) corresponding in the display device 100 to, to carry out the computing of the special domestic animal corrected parameter of contrast, and produce a plurality of gradating properties corrected parameters, then, be stored in storer 112 again.When main frame 131 sends specific order or makes display device 100 reopening machines when triggering corresponding firmware, from storer 112 these gradating properties corrected parameters of acquisition, in order to produce a contrast characteristic look-up table, at last, again this tone characteristic look-up table is write in the register of scaler 113 for scaler 113 uses.

In addition, tone characteristic look-up table production method and the display device 100 according to one embodiment of the invention has following at least advantage:

Among (1) one embodiment, when the GTG briliancy is converted to the briliancy component of red/indigo plant/green (R/G/B) look, according to the degree of the light leak of display panel, revise the briliancy component of red/indigo plant/green (R/G/B) look, can make the briliancy component of red/indigo plant/green (R/G/B) look of being tried to achieve more accurate.

Among (2) one embodiment, according to the target gradating properties (is 2.2 as gamma) of user's demand when value is revised, can also revise according to the most black ultimate value of display panel 114, revise reference target contrast (Gamma) family curve that ideal formula is tried to achieve, the low order colour cast defective that therefore improvement may occur.

Among (3) one embodiment, colour temperature control is revised: when carrying out the gradating properties correction, not only can revise according to target gradating properties (is 2.2 as the gamma) value of user's demand, also can select a target color temperature value, carry out colour temperature control and revise, full GTG colour temperature all is adapted to target colour temperature (for example being 5000K or 9000K).

Though the present invention with preferred embodiment openly as above; right its is not in order to qualification the present invention, those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the appended claims person of defining.In addition, arbitrary embodiment of the present invention or claim must not reached whole purpose disclosed in this invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting the scope of protection of present invention.

Claims (16)

1. tone characteristic look-up table production method comprises:

Receive the display characteristic of a plurality of specific patterns;

According to the display characteristic of these specific patterns and utilize a non-linear interpolation algorithm to obtain the display characteristic of a plurality of colors, wherein the quantity of these specific patterns is less than the product of the quantity of the display characteristic of the quantity of these colors and these colors; And

According to a maximum display characteristic value and a target gradating properties value of the display characteristic of these colors, the display characteristic of revising these colors is to produce a contrast characteristic look-up table;

Wherein, these specific patterns comprise a plurality of grey scale pattern and these grey scale pattern in man-to-man mode corresponding to a plurality of exponent numbers, and the exponent number of a pair of adjacent grey scale pattern is different from another to the exponent number of adjacent grey scale pattern at interval at interval in these grey scale pattern.

2. this step that the method for claim 1, wherein produces this tone characteristic look-up table also includes:

According to a target color temperature value, the display characteristic of revising these colors is to produce this tone characteristic look-up table.

3. the method for claim 1, wherein, these colors comprise redness, green and blue, and the display characteristic of these specific patterns comprises the chroma of this red specific pattern, the chroma of this green specific pattern, the chroma of this blue specific pattern and the briliancy of these grey scale pattern.

4. method as claimed in claim 3, wherein, this step of obtaining the display characteristic of these colors also includes:

According to the chroma of the briliancy of these grey scale pattern and these redness, green and blue specific pattern, obtain redness, green and the blue briliancy component of these grey scale pattern respectively; And

According to redness, green and the blue briliancy component of these grey scale pattern, utilize this non-linear interpolation algorithm to obtain the redness of these grey scale pattern, green and blue briliancy component respectively.

5. method as claimed in claim 4, wherein, obtain the redness, green of these grey scale pattern and this step of blue briliancy component and include:

Chroma according to these redness, green and blue specific pattern is tried to achieve a chroma display characteristic matrix, obtains redness, green and the blue briliancy component of these grey scale pattern more respectively according to the briliancy of this chroma display characteristic matrix and these grey scale pattern.

6. method as claimed in claim 4, wherein, obtain the redness, green of these grey scale pattern and this step of blue briliancy component and include:

Redness, green and the blue briliancy component of these grey scale pattern of briliancy correction of the light leak during according to a zeroth order.

7. method as claimed in claim 4, wherein, the slope that this non-linear interpolation algorithm comprises the redness that makes two adjacent these grey scale pattern, green and blue briliancy component is a linear change.

8. method as claimed in claim 4, wherein, obtain the redness, green of these grey scale pattern and this step of blue briliancy component and also include:

According to redness, green and blue pairing these briliancy of these grey scale pattern of target color temperature value correction, to produce this tone characteristic look-up table.

9. method as claimed in claim 8, wherein, this target color temperature value is a target colour temperature tristimulus values.

10. the method for claim 1, wherein the numerical value of these exponent numbers is the GTG value of 0 to 255 integer, and the numerical value of these exponent numbers is also inequality each other.

11. the method for claim 1, wherein, in these grey scale pattern should to the exponent number of adjacent grey scale pattern less than this another to the exponent number of adjacent grey scale pattern, and in these grey scale pattern should to rank between the exponent number of adjacent grey scale pattern less than this another to the exponent number of adjacent grey scale pattern at interval.

12. a display device comprises:

One storer, store a contrast characteristic look-up table, and this tone characteristic look-up table is the display characteristic that utilizes a plurality of specific patterns, produced with a non-linear interpolation algorithm, wherein these specific patterns comprise a plurality of grey scale pattern and these grey scale pattern in man-to-man mode corresponding to a plurality of exponent numbers, and the exponent number of a pair of adjacent grey scale pattern is different from another to the exponent number of adjacent grey scale pattern at interval at interval in these grey scale pattern; And

One graphics processing unit receives a picture signal, and this storer reads this tone characteristic look-up table certainly, again according to this this picture signal of tone characteristic look-up table correction, produces once picture signal to a display panel of revising.

13. display device as claimed in claim 12, wherein, the method that produces this tone characteristic look-up table includes:

According to the display characteristic that display characteristic and this non-linear interpolation mode of these specific patterns are calculated at least one color, wherein the quantity of these specific patterns is less than the product of quantity with the quantity of the display characteristic of this at least one color of this at least one color; And

According to a maximum display characteristic value and a target gradating properties value of the display characteristic of this at least one color, the display characteristic of revising this at least one color is to produce this tone characteristic look-up table.

14. display device as claimed in claim 13, wherein, this at least one color comprises the one at least in a redness, the green or blueness, and the display characteristic of these specific patterns comprises corresponding to the chroma of these specific patterns of this at least one color and the briliancy of these grey scale pattern.

15. display device as claimed in claim 13, wherein, this this step that produces the display characteristic of these colors of correction in the method for this tone characteristic look-up table includes:

According to the briliancy of these grey scale pattern and corresponding to the chroma of these specific patterns of this at least one color, obtain redness, green and the blue briliancy component of these grey scale pattern respectively; And

According to redness, green and the blue briliancy component of these grey scale pattern, utilize this non-linear interpolation mode to obtain the redness of these grey scale pattern, green and blue briliancy component respectively.

16. display device as claimed in claim 15, wherein, this this step that produces the redness of obtaining these grey scale pattern in the method for this tone characteristic look-up table, green and blue briliancy component also comprises:

Redness, green and the blue briliancy component of these grey scale pattern of briliancy correction of the light leak during according to a zeroth order.

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