Display irregularity correction method

An uneven display correction method, characterized by including:

• a first step of dividing a display area of a display panel into a plurality of unit areas, the first step setting one arbitrary unit area among the unit areas at a reference area, the first step previously determining a value as a correction parameter in each unit area, the value corresponding to a difference between a light-emission start gradation level of the unit area and the light-emission start gradation level of the reference area;
• and
• a second step of correcting an input video signal based on the correction parameter determined in each unit area,
• wherein the first step includes:
• an a step of dividing a display area of a display panel into a plurality of unit areas;
• a b step of measuring brightness of each unit area in one predetermined gradation level;
• a c step of determining a light-emission efficiency characteristic in an arbitrary unit area;
• and
• a d step of computing the value as the correction parameter in each unit area by setting one arbitrary unit area among the unit areas at the reference area based on the brightness measured in each unit area in the b step and the light-emission efficiency characteristic determined in the c step, the value corresponding to the difference between the light-emission start gradation level of the unit area and the light-emission start gradation level of the reference area.