Plasma Display Apparatus

A plasma display apparatus having a plasma display panel for forming a plurality of subfields having different weights of luminance from a video signal of one frame and executing a gradation display on the basis of said plurality of subfields, comprising:

• a frame rate converting unit for outputting a conversion signal whose frame rate has been at least doubled by forming at least two frames having same video contents as those of each frame of the video signal;
• and
• a subfield forming unit for forming a plurality of subfields corresponding to each frame of the conversion signal from said frame rate converting unit,
• wherein said plurality of subfields corresponding to each frame of said conversion signal formed by said subfield forming unit are divided into a first division subfield group and a second division subfield group, each of said division subfield groups is further classified into an upper subfield group on the side where said weight is large and a lower subfield group on the side where said weight is small, and
• said subfield forming unit makes said weights of said upper subfield group symmetrical between said first and second division subfield groups and makes said weight of each subfield belonging to said lower subfield group in said first division subfield group different from said weight of each subfield belonging to said lower subfield group in said second division subfield group, thereby making the weights of said lower subfield groups asymmetrical between said first and second division subfield groups.

A plasma display apparatus having a plasma display panel for forming a plurality of subfields having different weights of luminance from a video signal of one frame and executing a gradation display on the basis of said plurality of subfields, comprising:

• a frame rate converting unit for outputting a conversion signal whose frame rate has been at least doubled by forming at least two frames having video contents corresponding to each frame of the video signal;
• and
• a subfield forming unit for forming a plurality of subfields corresponding to each frame of the conversion signal from said frame rate converting unit,
• wherein said plurality of subfields corresponding to each frame of said conversion signal formed by said subfield forming unit are divided into a first division subfield group and a second division subfield group, each of said division subfield groups is further classified into an upper subfield group on the side where said weight is large and a lower subfield group on the side where said weight is small, and
• said subfield forming unit controls the weights of said subfields in such a manner that in one frame of said conversion signal,
• a peak of said weight to said upper subfield group is formed in correspondence to each of said first and second subfield groups, and
• one peak of said weight to said lower subfield group is formed.