CN101447161B - Method for regulating flat panel display screen - Google Patents
Method for regulating flat panel display screen Download PDFInfo
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- CN101447161B CN101447161B CN2008103059177A CN200810305917A CN101447161B CN 101447161 B CN101447161 B CN 101447161B CN 2008103059177 A CN2008103059177 A CN 2008103059177A CN 200810305917 A CN200810305917 A CN 200810305917A CN 101447161 B CN101447161 B CN 101447161B
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Abstract
The invention relates to a flat panel display screen, particularly a method for regulating the color temperature and the brightness of a flat panel display screen. The invention solves the problem of poor effect of regulating the color temperature and the brightness of the flat panel display screen in the prior art, and modifies the method of regulating the color temperature and the brightness of the flat panel display screen to improve the display effect of the flat panel display screen. The color temperature regulation is completed by regulating the GAMMA table in the chip to change the proportional relationship of RGB in the table, thereby ensuring that the output of color temperature meets the requirement. In the brightness regulation, different standards are adopted according to the difference in maximum brightness between LCD and PDP, thereby making full use of the characteristics of the display screen. The flat panel display screen-regulating method is applied to the regulation of color temperature and brightness of LCD and PDP, can reduce the difference in color temperature, white balance and brightness among different display screens, and can make best use of advantages of the display screen.
Description
Technical field
The present invention relates to panel display screen, particularly panel display screen colour temperature and luminance regulating method.
Background technology
Panel display screen comprises plasma panel (PDP), LCDs (LCD) etc., has following relation: L=KI between its input signal strength I and the output signal strength L
Gamma, wherein K is a constant, gamma is an index.Because than highlight bar sensitivity, promptly can discover in the low-light level district and the less color and the variation of brightness, so the gamma value is generally greater than 1 by human eye in the low-light level district for human eye.
Because the standard configuration difference of gamma value when dispatching from the factory of different display screens, and the processing mode to brightness and color there are differences between the different cassette mechanism, therefore at different display screens and different movements, just can not guarantee that three primary colours (RGB) have identical photoelectricity inversion cuver, just when input signal is the white signal of same magnitude, the chromaticity coordinates of output signal and brightness value be different, even the error of white balance can appear.
In the prior art, for the adjustment of colour temperature, most methods is to realize by adjusting white balance, because LCD display and PDP display screen colour temperature is linear bad, it is unsatisfactory therefore to carry out the adjustment effect of colour temperature by the adjustment white balance.For the adjustment of brightness curve, because different display screens have different high-high brightness, reaching preferably, effect cannot treat different things as the same.Not according to the high-high brightness difference of display screen, adopt different parameters to adjust in the prior art, can not give full play to the advantage of various display screens self.On the other hand, owing to influencing each other of colour temperature and brightness, above-mentioned method of adjustment is usually attended to one thing and lose sight of another.
Summary of the invention
Technical matters to be solved by this invention, be exactly panel display screen colour temperature and brightness to be adjusted the bad shortcoming of effect at prior art, a kind of method for regulating flat panel display screen is provided,, improves the display effect of display screen to improve the method for adjustment of panel display screen colour temperature and brightness.
The present invention solve the technical problem, and the technical scheme of employing is, method for regulating flat panel display screen comprises colour temperature adjustment and brightness adjustment, and concrete steps are as follows:
A, setting original state: GAMMA table original state are under the condition of linearity, input GTG signal, and the chromaticity coordinates desired value of the corresponding GTG of given display screen is designated as S;
The pairing chromaticity coordinates measured value of GTG signal that b, measurement are set is designated as M, obtains the difference between measured value M and the desired value S;
The side-play amount of R value and B value in c, the given GAMMA table is adjusted R value and B value in the GAMMA table according to this side-play amount, changes the chromaticity coordinates measured value M of the corresponding GTG signal that measures by the proportionate relationship that changes RGB;
D, replace respective value in the GAMMA table with adjusted R value and B value;
E, repeated execution of steps b～d, the difference between tested GTG pairing chromaticity coordinates measured value M and desired value S is within the range of permission; Finish the colour temperature adjustment, enter following step;
The maximum brightness value of f, measurement display screen this moment is set the luma target curve;
G, measure the brightness value L v of each GTG correspondence, calculate this value and the brightness value that obtains according to the luma target curve between difference;
H, according to the G value in this moment GAMMA table, be designated as Gi, the side-play amount of given G value obtains the Gn value, and then R value and the B value corresponding with this Gn value that obtain according to step a～e, replace Gi value and corresponding R value, B value thereof in the described GAMMA table with this Gn value and corresponding R value, B value;
I, repeating step g, h, the difference between pairing brightness value L v of tested GTG and the brightness value that obtains according to the luma target curve is finished the brightness adjustment in allowed limits.
The invention has the beneficial effects as follows, can dwindle the difference of different display screen colour temperatures, white balance and brightness, and can bring into play the advantage of display screen self.
Description of drawings
Fig. 1 is the program flow diagram of embodiment;
The luma target curve map of Fig. 2 embodiment.
Embodiment
The present invention is by the adjustment to movement GAMMA table to the adjustment of colour temperature, changes the proportionate relationship of the RGB in this table, thereby makes the colour temperature of output meet the demands.In the adjustment of brightness, the present invention is different according to self high-high brightness of LCD and PDP, takes different standards, thereby gives full play to the characteristics of various display screens self.
Technical scheme of the present invention is, method for regulating flat panel display screen comprises colour temperature adjustment and brightness adjustment, and concrete steps are as follows:
A, setting original state: GAMMA table original state are under the condition of linearity, input GTG signal, and the chromaticity coordinates desired value of the corresponding GTG of given display screen is designated as S;
The pairing chromaticity coordinates measured value of GTG signal that b, measurement are set is designated as M, obtains the difference between measured value M and the desired value S;
The side-play amount of R value and B value in c, the given GAMMA table is adjusted R value and B value in the GAMMA table according to this side-play amount, changes the chromaticity coordinates measured value M of the corresponding GTG signal that measures by the proportionate relationship that changes RGB;
D, replace respective value in the GAMMA table with adjusted R value and B value;
E, repeated execution of steps b～d, the difference between tested GTG pairing chromaticity coordinates measured value M and desired value S is within the range of permission; Finish the colour temperature adjustment, enter following step;
The maximum brightness value of f, measurement display screen this moment is set the luma target curve;
G, measure the brightness value L v of each GTG correspondence, calculate this value and the brightness value that obtains according to the luma target curve between difference;
H, according to the G value in this moment GAMMA table, be designated as Gi, the side-play amount of given G value obtains the Gn value, and then R value and the B value corresponding with this Gn value that obtain according to step a～e, replace Gi value and corresponding R value, B value thereof in the described GAMMA table with this Gn value and corresponding R value, B value;
I, repeating step g, h, the difference between pairing brightness value L v of tested GTG and the brightness value that obtains according to the luma target curve is finished the brightness adjustment in allowed limits;
Further, GTG signal described in the step a is GTG signal uniformly-spaced;
Further, among the step f, described target brightness value determines that method is, brightness curve is divided into three sections, and low-light level partly adopts three sections straight lines to connect; Intermediate luminance partly adopts the GAMMA curve to connect; Highlighted part adopts straight line to connect;
Concrete, it is 0～20% that low highlights divides corresponding grey exponent number, and it is 20%～80% that middle light divides corresponding grey exponent number, and the corresponding grey exponent number of highlighted part is 80%～100%;
Further, grey exponent number is that 0 brightness value is fixed as 0cd/m
2+ 0.5cd/m
2, grey exponent number is that 10% brightness value is fixed as 2.0cd/m
2± 0.5cd/m
2, grey exponent number is that 20% brightness value is fixed as 12cd/m
2± 2cd/m
2, the brightness curve that low highlights divides is above 3 connecting line;
Further, the GAMMA parameter of curve that partly adopts of described intermediate luminance is as follows:
350≤L
Max≤ 400 o'clock, L
80=400*70%, GAMMA=1.4;
400＜L
Max＜600 o'clock, L
80=L
Max* (0.7-(0.1/200) * (L
Max-400)), GAMMA=1.4+ (0.2/200) * (L
Max-400);
L
Max〉=600 o'clock, GAMMA=2.3;
Wherein: L
MaxBe the display screen high-high brightness, it is worth at 400cd/m
2With 600cd/m
2Between; L
80Brightness when being grey exponent number 80%;
High-high brightness when further, determining grey exponent number 80% according to the high-high brightness of display screen;
Concrete, described panel display screen is PDP display screen or LCD display.
Embodiment
Fig. 1 shows the flow process of the panel TV set method of adjustment of present embodiment:
Set the GTG signal (in 0 to 255 grade white, uniformly-spaced choosing) of input flat panel TV complete machine.
1, the method for adjustment of colour temperature:
1.1, at first given linear GAMMA table, can obtain the chromaticity coordinates that display screen shows corresponding GTG according to this table, be designated as S (x
s, y
s);
1.2, input GTG signal, and measure the chromaticity coordinates of display screen display setting GTG signal, be designated as M (x
m, y
m); The side-play amount of R value and B value in the given then GAMMA table makes y in the chromaticity coordinates by adjustment B value
mNear y
sMake x by adjusting the R value
mNear x
s
1.3, repeat to adjust B value and R value and make chromaticity coordinates M (x
m, y
m) near desired value S (x
s, y
s); As M (x
m, y
m)-S (x
s, y
s) during less than setting value, replace respective value in the GAMMA table with adjusted B value and R value; The colour temperature adjustment finishes.
2, the method for adjustment of brightness: after finishing the adjustment of colour temperature, the proportionate relationship of RGB is just determined, obtains a new linear GAMMA table, and the new brightness curve of proportionate relationship generation according to RGB writes in the display screen control chip.
2.1, measure the high-high brightness of display screen this moment, obtain the luma target curve according to table 1 and Fig. 2;
2.2, input GTG signal, measure the brightness value L v of each GTG correspondence;
2.3, according to the G value in this moment GAMMA table, be designated as Gi, the side-play amount of given G value, obtain the Gn value, and then according to new linear GAMMA table, R value and the B value corresponding with this Gn value that arrive are replaced Gi value and corresponding R value, B value thereof in the described GAMMA table with this Gn value and corresponding R value, B value;
2.4, repeating step 2.2,2.3, the difference between pairing brightness value L v of tested GTG and the brightness value that obtains according to the luma target curve is finished the brightness adjustment in allowed limits.
In this example, when high-high brightness greater than 600cd/m
2The time, the whole curve that adopts Gamma2.3 of luma target curve;
When high-high brightness at 350cd/m
2To 600cd/m
2Between the time, Fig. 2 luma target curve adopts following syllogic.
First section, low highlights branch, corresponding grey exponent number is 0～20%, grey exponent number is that 0 brightness value is fixed as 0cd/m
2+ 0.5cd/m
2, grey exponent number is that 10% brightness value is fixed as 2.0cd/m
2± 0.5cd/m
2, grey exponent number is that 20% brightness value is fixed as 12cd/m
2± 2cd/m
2, the brightness curve that low highlights divides is above 3 connecting line.
Second section, the middle light branch, corresponding grey exponent number is 20%～80%, adopts the GAMMA curve, the parameter of GAMMA curve must change its variation pattern such as table 1 according to different maximum brightness value.This section curve can be determined by some grades of brightness of test same intervals.Computing formula as shown in the formula:
Y
x＝(Y
0.8-Y
0.2)*{(x-0.2)/(0.8-0.2)}
gamma+Y
0.2
Y wherein
xRepresent that grey exponent number is the target brightness value under the x%, x is the number percent number of grey exponent number, and gamma is a parameter, determines that mode is as shown in table 1.
The 3rd section, highlighted part, corresponding grey exponent number is 80%～100%, adopts in the GAMMA table position and adopts straight line to connect.
The relation of brightness curve and colour temperature: according to the adjusted result of the colour temperature proportionate relationship of RGB as can be known; Can change brightness value by the size of adjusting rgb value, keep the proportionate relationship between the rgb value simultaneously, finally when brightness meets the demands, just obtain needed GAMMA table data.
The present invention can be used for colour temperature and the brightness adjustment of PDP or LCD.
Table 1
Claims (12)
1. method for regulating flat panel display screen comprises colour temperature adjustment and brightness adjustment, it is characterized in that, comprises the steps:
A, setting original state: GAMMA table original state are under the condition of linearity, and the chromaticity coordinates desired value of the corresponding GTG of given display screen is designated as S;
B, input GTG signal are measured the pairing chromaticity coordinates measured value of setting of GTG signal, are designated as M, obtain the difference between measured value M and the desired value S;
The side-play amount of R value and B value in c, the given GAMMA table is adjusted R value and B value in the GAMMA table according to this side-play amount, changes the chromaticity coordinates measured value M of the corresponding GTG signal that measures by the proportionate relationship that changes RGB;
D, replace respective value in the GAMMA table with adjusted R value and B value;
E, repeated execution of steps b～d, the difference between tested GTG pairing chromaticity coordinates measured value M and desired value S is within the range of permission; Finish the colour temperature adjustment, enter following step;
The maximum brightness value of f, measurement display screen this moment is set the luma target curve;
G, measure the brightness value L v of each GTG correspondence, calculate this value and the brightness value that obtains according to the luma target curve between difference;
H, according to the G value in this moment GAMMA table, be designated as Gi, the side-play amount of given G value obtains the Gn value, and then R value and the B value corresponding with this Gn value that obtain according to step a～e, replace Gi value and corresponding R value, B value thereof in the described GAMMA table with this Gn value and corresponding R value, B value;
I, repeating step g, h, the difference between pairing brightness value L v of tested GTG and the brightness value that obtains according to the luma target curve is finished the brightness adjustment in allowed limits.
2. method for regulating flat panel display screen according to claim 1 is characterized in that, the signal of GTG described in the step a is GTG signal uniformly-spaced.
3. method for regulating flat panel display screen according to claim 1 and 2 is characterized in that, among the step f, described luma target curve determines that method is, brightness curve is divided into three sections, and low-light level partly adopts three sections straight lines to connect; Intermediate luminance partly adopts the GAMMA curve to connect; Highlighted part adopts straight line to connect.
4. method for regulating flat panel display screen according to claim 3 is characterized in that, it is 0～20% that low highlights divides corresponding grey exponent number, and it is 20%～80% that middle light divides corresponding grey exponent number, and the corresponding grey exponent number of highlighted part is 80%～100%.
5. method for regulating flat panel display screen according to claim 4 is characterized in that, grey exponent number is that 0 brightness value is fixed as 0cd/m
2+ 0.5cd/m
2, grey exponent number is that 10% brightness value is fixed as 2.0cd/m
2± 0.5cd/m
2, grey exponent number is that 20% brightness value is fixed as 12cd/m
2± 2cd/m
2, the brightness curve that low highlights divides is above 3 connecting line.
6. as claim 4 or 5 described method for regulating flat panel display screen, it is characterized in that the GAMMA parameter of curve that described intermediate luminance partly adopts is as follows:
350≤L
Max≤ 400 o'clock, L
80=400*70%, GAMMA=1.4;
400＜L
Max＜600 o'clock, L
80=L
Max* (0.7-(0.1/200) * (L
Max-400)), GAMMA=1.4+ (0.2/200) * (L
Max-400);
L
Max〉=600 o'clock, GAMMA=2.3;
Wherein: L
MaxBe the display screen high-high brightness, L
80Brightness when being grey exponent number 80%.
7. method for regulating flat panel display screen according to claim 6 is characterized in that, the high-high brightness when determining grey exponent number 80% according to the high-high brightness of display screen.
8. method for regulating flat panel display screen according to claim 6 is characterized in that, described panel display screen is the PDP display screen.
9. method for regulating flat panel display screen according to claim 6 is characterized in that, described panel display screen is a LCD display.
10. according to claim 4 or 5 described method for regulating flat panel display screen, it is characterized in that the high-high brightness when determining grey exponent number 80% according to the high-high brightness of display screen.
11. method for regulating flat panel display screen according to claim 10 is characterized in that, described panel display screen is the PDP display screen.
12. method for regulating flat panel display screen according to claim 10 is characterized in that, described panel display screen is a LCD display.
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| CN101447161B true CN101447161B (en) | 2011-04-06 |
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