Patent ID: 7633533

Claim:
A method for a display device to detect flicker frequency comprising the following steps: (a) defining a sensing window including a plurality of adjacent sensing sections of a same size on a display panel of the display device based on resolution of the display panel and an M Hz frequency and an N Hz frequency of a light source; (b) calculating a reference average signal detected by a first sensing section of the sensing window; (c) calculating a first average signal detected by an (n+1)th sensing section of the sensing window; (d) calculating a second average signal detected by an (m+1)th sensing section of the sensing window, wherein a ratio between an area covered by the first through mth sensing sections and an area covered by the first through nth sensing sections is proportional to a ratio between M and N; (e) calculating a first difference value corresponding to a difference between the first and reference average signals; (f) calculating a second difference value corresponding to a difference between the second and reference average signals; (g) determining a relationship between the first and second difference values; and (h) outputting corresponding signals based on the relationship between the first and second difference values.