Patent ID: 6795091
Filing Date: 2004-09-21
Classification: G09G

Abstract:
A display apparatus, comprising:a gamma correction part for gamma correcting an input video signal; a selection input part for selecting the amount of correction by the gamma correction part; and a micro-control unit for controlling the correction amount by the gamma correction part depending upon a selection from the selection input part, wherein the gamma correction part is comprised of: a plurality of gamma section parts for receiving video signals having voltage levels of predetermined upper limits, or less, and gamma correcting the video signals; and a mixer for composing the video signals gamma corrected by the gamma section parts into a video image for display, wherein each of the gamma section parts is comprised of: one or more signal amplifier parts sectioned into a plurality of sections depending upon the voltage levels of the video signals, for receiving the video signals having the predetermined upper limits, or less, corresponding to the respective sections and amplifying them at predetermined rates; a signal converter part converting the video signal amplified in each signal amplifier part into the form of an exponential function, processing the video signal into the form of a reverse function thereafter, and outputting the video signal in the form of a converted hyperbolic tangent function; and a signal adjuster part adjusting a voltage level of the converted video signal according to a control signal from the micro-control unit.