Patent ID: 7029125

Claim:
A projecting device with a keystone correction function for correcting a projecting frame outputting from the projecting device, the projecting device has a height-adjustable supporting foot for adjusting an angle of the projecting device, the projecting device comprising: an adjustable part, coupled to the supporting foot, for determining an electric property of the adjustable part according to a height of the supporting foot, the adjustable part including: an electric element connected to the supporting foot, and a terminal disposed with respect to the projecting device, wherein a position where the electric element is coupled to the terminal changes when the height of the supporting foot is adjusted, and the electric element with respect to the position determines the electric property of the adjustable part; a signal generator, coupled to the adjustable part, for outputting an adjusting signal according to the electric property of the adjustable part; and a correction circuit, coupled to the signal generator, for performing a keystone correction on the projecting frame according to the adjusting signal.