Patent ID: 8643707

Claim:
An image signal processing apparatus which performs gradation control on respective pixels of an image display device, said image signal processing apparatus comprising: a microprocessor; and a non-transitory memory having stored thereon executable instructions, which when executed by the microprocessor, cause said image signal processing apparatus to function as an image signal processing unit configured to control light emission and non-light emission of respective subfields so as to represent gradation of a field, the field being a unit display period of the pixels and being divided into the subfields having different light emission periods and arranged in a predetermined sequence, wherein the predetermined sequence of subfields includes at least five subfields, and in the predetermined sequence of subfields, the subfields are arranged in a manner such that (i) a subfield having a shortest light emission period among the subfields is in a first place, the first place being at a top of the predetermined sequence of subfields, (ii) either a subfield having a longest light emission period among the subfields or a subfield having a second longest light emission period among the subfields is in a second place, the second place being immediately after the first place, and (iii) either the subfield having the longest light emission period among the subfields or the subfield having the second longest light emission period among the subfields is in a third place, the third place being immediately after the second place, wherein if the subfield having the longest light emission period among the subfields is in the second place, then the subfield having the second longest light emission period among the subfields is in the third place, and wherein if the subfield having the second longest light emission period among the subfields is in the second place, then the subfield having the longest light emission period among the subfields is in the third place.