Patent ID: 7649530

Claim:
A mode-selecting apparatus for selecting one of a first mode in which images are displayed on a display unit in accordance with a vertical synchronization control signal and a horizontal synchronization control signal, and a second mode in which images are displayed on said display unit in accordance with a data-enable signal, including: a first unit which counts a number of input horizontal synchronization control signals in each of frame periods; a second unit which counts a number of input data-enable signals in each of frame periods; and a third unit which selects one of said first and second modes in accordance with both said number of input horizontal synchronization control signals and said number of input data-enable signals, wherein said first unit resets said number of input horizontal synchronization control signals, and said second unit resets said number of input data-enable signals, wherein said first unit detects a first timing at which said number of input horizontal synchronization control signals is equal to M wherein M indicates a predetermined positive integer, and said second unit detects a second timing at which said number of input data-enable signals is equal to N wherein N indicates a predetermined positive integer smaller than said M, and wherein said third unit selects said first mode if said number of input data-enable signals is equal to zero (0) at an earlier timing among said first and second timings, and selects said second mode if said number of input data-enable signals is not equal to zero (0) at an earlier timing among said first and second timings.