Patent ID: 7710360

Claim:
A plasma display device, comprising: a display unit which expresses a gradation of an image by selecting a pattern of subfields to light up out of plural subfields composing one field, each of the subfields having a weighted number of sustain pulses; a nonlinear conversion circuit which nonlinearly converts first image data corresponding to an input image signal to second image data having a gradation value smaller than a gradation value of the first image data and expresses the second image data by a real part and an error part; an error diffusion circuit which, when the error part of the second image data is not zero, spatially or temporally diffuses the error part; and a subfield pattern conversion circuit which selects the lighting pattern of subfields based on the error-diffused second image data, wherein the second image data does not have predetermined subfield lighting pattern image data, and wherein said nonlinear conversion circuit outputs, in place of the predetermined subfield lighting pattern image data, interpolated data calculated by interpolation using plural subfield lighting pattern image data patterns adjacent to the predetermined subfield lighting pattern in the second image data.