Abstract: A luminance gradation correcting apparatus which can properly correct the gradation of a luminance level even if a size of actual image portion of an image differs from a size of image.

Abstract: A first correlation between a present field of an input video signal and a one-field preceding field, and a second correlation between the present field and a one-field succeeding field are detected. The first correlation and the second correlation are compared with each other, and the input video signal is determined as a telecine-converted video signal when either of the first correlation or the second correlation is larger than the other correlation.

Abstract: A one-line memory is provided for sequentially writing input picture data of one horizontal scanning line and for sequentially reading the written picture data. A plurality of expansion and contraction circuits are provided for increasing and decreasing the number of picture data of a plurality of sequentially inputted horizontal scanning lines. The expansion and contraction circuits produce picture data increased or reduced in line in dependency on coefficients. A picture memory is provided for storing the picture data from the expansion and contraction circuit.

Abstract: A plasma display apparatus is disclosed wherein a column electrode driver for a PDP has a simpler constitution to facilitate wirings between the column electrode driver and column electrodes in the PDP.

Abstract: A luminance adjusting apparatus for a plasma display panel allows an adjustment of the luminance of a whole panel in a continuous manner. An adjustment to the number of times of light emission and a gain adjustment to pixel data are performed in association with each other in response to a luminance adjustment.