Patent ID: 6982732
Filing Date: 2006-01-03
Classification: G09G

Abstract:
1. A display panel driving method for performing emission driving of each of light emission elements in a display panel in which the display screen is formed by a plurality of said light emission elements in each of N subfields constituting one field interval of the input image signal; wherein light emissions in said N subfields are performed in such a way that a light emitting state is produced in said N subfields in an ascending order of weightings of the subfields, in which in order to realize an m-th grayscale level (where m is a natural number from 1 to N+1), light emission is performed in one subfield in addition to subfields in which light emission is performed to realize an (m−1)th grayscale level, and according to at least one of the magnitude of the vertical sync frequency of said input image signal and the mean brightness of the screen expressed by said input image signal, switching between first and second emission driving sequences is performed, wherein said first emission driving sequence begins with a reset step provided in a head subfield, to display intermediate brightnesses in N+1 stages, from a first grayscale to an (N+1)th grayscale, by causing emission of said light emission elements in each of n (where n is an integer from 0 to N) of said subfields continuously within said field interval, in a number corresponding to the brightness level expressed by said input image signal, and said second emission driving sequences comprises first and second halves of said field interval each of which begins with a reset step provided in a head subfield, in which at least a pair of subfields, which have weighting values adjoining in an order of the subfields' weightings, are arranged at an interval of nearly one-half of said field interval, and in which, after causing emission of said light emission elements in each of said continuous subfields in the first half of said field interval, in a number corresponding to the brightness level expressed by said input image signal, said light emission elements are caused to emit in each of said continuous subfields in the second half of said field interval, in a number corresponding to the brightness level expressed by said input image signal, whereby intermediate brightness is displayed in N+1 stages, from a first grayscale to an (N+1)th grayscale.