Display device correction method and display device correction device

1. A display device correction method performed by a controller that performs display control on a display panel including a plurality of display pixels, in a display device which includes the display panel and the controller, the display device correction method comprising:

obtaining a cumulative value of a pixel signal supplied to a drive transistor which is included in a current pixel to be processed among the plurality of display pixels and supplies drive current according to the pixel signal to a light emitting element;

calculating a shift amount of a threshold voltage of the drive transistor, using the cumulative value;

calculating an amount of change in mobility, using the shift amount; and

calculating a correction parameter for correcting a gradation value of the pixel signal, using the amount of change in mobility,

wherein in the calculating of the amount of change in mobility, the amount of change in mobility is calculated so as to satisfy a relational expression Δμ=C 1 (ΔV th ) γ +C 2 , where ΔV th denotes the shift amount, and Δμ denotes the amount of change in mobility, and coefficients C 1 , C 2 , and γ are each a value calculated in advance using an actual measured value of the amount of change in mobility with respect to the shift amount, and

wherein in the calculating of the shift amount, the shift amount is calculated so as to satisfy a relational expression ΔV th =A(V gs −V th +V offset ) α t β , where t denotes the cumulative value, and V gs −V th denotes a design value of a difference between a gate-source voltage of the drive transistor and the threshold voltage, and coefficients A, V offset , α, and β are each a value calculated in advance using a graph indicating an actual measured value of the shift amount with respect to the cumulative value.