1. A method of displaying an image with unevenness correction on an organic electroluminescence display device, comprising: (a) providing the organic electroluminescence display device having a plurality of pixels, each including a transistor; (b) measuring respective first Vgs-Id characteristics of the transistors in each of a selected first plurality of pixels; (c) calculating one or more second Vgs-Id characteristics using the measured Vgs-Id characteristics; (d) calculating one or more first approximation functions using the second Vds-Id characteristics, wherein each approximation function is defined by the equation having three values a, b and c: 
 Id =( a ( Vgs−b )) c for corresponding sets of values a, b and c calculated so that each first approximation function approximates the corresponding second Vds-Id characteristic; (e) calculating a value c′ using the one or more first approximation functions; (f) measuring respective third Vgs-Id characteristics of the transistors in each of a selected second plurality of pixels; (g) calculating, for each third Vgs-Id characteristic, a second approximation function using the corresponding third Vds-Id , wherein each second approximation function is defined by the equation having two values a′ and b′, and the value c′ calculated in step (e): 
 Id =( a ′( Vgs−b′ )) c for corresponding sets of values a and b and the calculated value of c so that each second approximation function approximates the corresponding third Vds-Id characteristic; (h) receiving an image data signal for each of the plurality of pixels; (i) calculating a plurality of corrected image signals using the respective image data signals and the respective second approximation functions of the corresponding pixels of the display device to correct for unevenness; and (j) applying each corrected image signal to the corresponding pixel of the display device to display a corresponding image with unevenness correction.