Patent ID: 8576251

Claim:
A scaling-up control method of a display device for converting an original image signal having a first resolution into an interpolated image signal having a second resolution, and converting the interpolated image signal into an output image signal having a third resolution, the scaling-up control method comprising steps of: setting a distance between two consecutive pixels of the original image signal in a first direction to be 1 unit length (U); setting n=1, X=0 and E=0, wherein n is a natural number, X is an actual position of the nth data, and E is a position error; acquiring an exact ratio factor (B/A) in the first direction and an approached ratio factor (C/D) in the first direction according to the first resolution and the third resolution, thereby calculating an error amount Δ between the exact ratio factor and the approached ratio factor, wherein A and B are natural numbers, and the numerator and the denominator of the fraction B/A are reduced to the lowest terms; (a) if n is not equal to an integer multiple of A, setting X=X+(C/D)U and E=E+Δ, or if n is equal to the an integer multiple of A, performing a global locking mechanism; (b) if E>L_min, setting X=X+L_min and E=E-L_min, wherein L_min is a distinguishable length; (c) performing a linear interpolation according to the original image signal or the interpolated image signal and X, thereby calculating at least one pixel value of the nth data; and (d) setting n=n+1, and going to the step (a).