Patent ID: 7663650

Claim:
A display device comprising a display panel including pixel cells, each pixel cell emitting light in each of a plurality of sub-fields for gray-scale display, each of the plurality of sub-fields assigned to a light-emitting period, the plurality of sub-fields constituting a field of a display period for an input video signal, said display device comprising: a brightness level frequency generation portion for deriving, as a brightness level frequency, a frequency for every brightness level of said input video signal on a frame basis; an accumulated brightness level frequency generation portion for deriving an accumulated brightness level frequency corresponding to each of the brightness levels by adding said brightness level frequency; and a control portion for setting the number of sub-fields for assignment to each different brightness segment region based on an effective maximum brightness level, which is a brightness level corresponding to said accumulated brightness level frequency that is smaller by a predetermined value than any one of said accumulated brightness level frequencies indicated as maximum, wherein said control portion includes a boundary value generation portion for generating a boundary value of a brightness level for each of said sub-fields based on said effective maximum brightness level, and a drive control portion for halftone-driving said pixel cells by said sub-fields, each set with the boundary value.