Display method of plasma display apparatus and plasma display apparatus
View Patent ↗A display method of a plasma display apparatus to which primary color video signals are inputted and which carries out color display by letting phosphors for primary colors emit light is provided. The display method displays the primary color video signals by changing a gray level of an output primary color video signal in accordance with a gray level of an input primary color video signal. When each gray level of the inputted primary color video signals changes from a first value to a second value which is larger than the first value, a gray level of a primary color video signal for a phosphor having the largest influence of luminance saturation properties among the phosphors is increased relative to a gray level of the other primary color video signal.
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, wherein the display method includes the steps of:
detecting an average picture level of the three primary color video signals;
controlling a total number of sustain pulses to be applied to one frame in accordance with the average picture level detected;
adjusting an output gray level so that a rate of change in a ratio of an output gray level with respect to an input gray level of a primary color video signal corresponding to a phosphor is smaller than a rate of change in a ratio of an output gray level with respect to an input gray level of a primary color video signal corresponding to other phosphors for two primary colors, the phosphor having the least decrease in an energy conversion efficiency as increase in the total number of sustain pulses when the total number of sustain pulses changes from a first value to a second value which is larger than the first value, among the phosphors for three primary colors; and
carrying out the color display by a subfield method in accordance with the output gray level of the three primary color video signals adjusted.
2. The display method of the plasma display apparatus according to claim 1 , wherein,
when the average picture level of an image inputted to the plasma display apparatus increases, the total number of sustain pulses is controlled so as to be decreased.
3. The display method of the plasma display apparatus according to claim 1 , wherein
the phosphors for the three primary colors are phosphors for red, green, and blue colors, and the phosphor having the least decrease in the energy conversion efficiency is the phosphor for blue color.
4. The display method of the plasma display apparatus according to claim 1 , wherein
the phosphor having the least decrease in the energy conversion efficiency is a phosphor having a higher luminance as increase in the number of emission than those of other phosphors for two colors.
5. 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, wherein, the plasma display apparatus includes:
a detecting unit of detecting an average picture level of the three primary color video signals;
a controlling unit of controlling a total number of sustain pulses to be applied to one frame in accordance with the average picture level detected;
an adjusting unit of adjusting an output gray level so that a rate of change in a ratio of an output gray level with respect to an input gray level of a primary color video signal corresponding to a phosphor is smaller than a rate of change in a ratio of an output gray level with respect to an input gray level of a primary color video signal corresponding to other phosphors for two primary colors, the phosphor having the least decrease in an energy conversion efficiency as increase in the total number of sustain pulses when the total number of sustain pulses changes from a first value to a second value which is larger than the first value, among the phosphors for three primary colors; and
a driving unit of driving a plasma display panel by a subfield method in accordance with the output gray level of the three primary color video signals adjusted.
6. The plasma display apparatus according to claim 5 , wherein,
when the average picture level of an image inputted to the plasma display apparatus increases, the controlling unit controls to decrease the total number of sustain pulses.
7. The plasma display apparatus according to claim 5 , wherein
the phosphors for the three primary colors are phosphors for red, green, and blue colors, and the phosphor having the least decrease in the energy conversion efficiency is the phosphor for blue color.
8. The plasma display apparatus according to claim 5 , wherein
the phosphor having the least decrease in the energy conversion efficiency is a phosphor having a higher luminance as increase in the number of emission than those of other phosphors for two colors.