White balance correction circuit and correction method for display apparatus that displays color image by controlling number of emissions or intensity thereof in accordance with plurality of primary color video signals

1. A display method of a plasma display apparatus which carries out color display by letting phosphors for three primary colors emit light in accordance with input three primary color video signals, comprising:

adjusting levels so that when each input gray level in accordance with input video signals of three primary color video signals changes from a first value to a second value which is larger than the first value, a ratio of change in a correction coefficient of a primary color video signal for a phosphor having the largest influence of luminance saturation properties among the three phosphors, the ratio being in accordance with a relationship of (output gray level)/(input gray level), is increased larger than the ratios of change in the correction coefficient of the other primary color video signals.

2. The display method of the plasma display apparatus according to claim 1 , wherein

the phosphors for the three primary colors are red, green, and blue, and the phosphor having the largest influence of luminance saturation properties is the phosphor for green.

3. The display method of the plasma display apparatus according to claim 1 , wherein

the phosphor having the largest influence of luminance saturation properties is a phosphor having decrease in unit emission luminance larger than those of the other phosphors as increase in the number of times of light emission.

4. A display method of a plasma display apparatus to which a plurality of primary color video signals are inputted and which carries out color display by letting phosphors for a plurality of primary colors emit light wherein comprising:

adjusting levels so that when each input gray level in accordance with input signals of the plurality of primary color video signals changes from a first value to a second value which is larger than the first value, a ratio of change in an output amplitude of a primary color video signal for a phosphor having the largest decrease in energy conversion efficiency as increase in the number of times of light emission among the plurality of phosphors is larger than a ratio of change in an output amplitude of the other primary color video signal.

5. The display method of the plasma display apparatus according to claim 4 , wherein

the phosphors for the plurality of primary colors are red, green, and blue, and the phosphor having the largest decrease in energy conversion efficiency as increase in the number of times of light emission among the plurality of phosphors is the phosphor for green.

6. The display method of the plasma display apparatus according to claim 4 , wherein

the phosphor having the largest decrease in energy conversion efficiency as increase in the number of times of light emission among the plurality of phosphors is a phosphor having decrease in unit emission luminance larger than that of the other phosphor as increase in the number of times of light emission.

7. A display method of a plasma display apparatus to which a plurality of primary color video signals are inputted and which carries out color display by letting phosphors for a plurality of primary colors emit light, the display method comprises comprising:

detecting input gray levels in accordance with input signals of the plurality of inputted primary color video signals;

calculating correction coefficients for white balance adjustment for the plurality of primary color video signals based on the detected input gray levels;

adjusting output gray levels of the plurality of primary color video signals by multiplying the input gray levels by the calculated correction coefficients; and

displaying images with using the primary color video signals whose output gray levels are adjusted, wherein,

when each input gray level of the plurality of primary color video signals changes from a first value to a second value which is larger than the first value, a ratio of change in the correction coefficient for a primary color video signal for a phosphor having the largest decrease in energy conversion efficiency as increase in the number of times of light emission among the phosphors for the plurality of primary colors is increased larger than a ratio of change in the correction coefficient of the other primary color video signal.

8. The display method of the plasma display apparatus according to claim 7 , wherein

the phosphors for the plurality of primary colors are red, green, and blue, and a phosphor having the largest decrease in energy conversion efficiency as increase in the number of times of light emission among the plurality of phosphors is the phosphor for green.