Apparatus and method for converting the resolution an image to a resolution of a lcd monitor

Abstract

An apparatus for converting resolution of an LCD is disclosed by which in case that a resolution of an image provided from an LCD monitor is low, it is converted according to a resolution of the LCD monitor by using a DCT (Discrete Cosine Transform) and an IDCT (Inverse Discrete Cosine Transform). The apparatus for converting resolution of an LCD monitor includes a computer for outputting color signals of R, G and B to be displayed on a screen of an LCD monitor and simultaneously outputting horizontal and vertical synchronous signals; a signal amplifying and adjusting unit for amplifying a level of the image signal input from the computer; a clamp for adjusting a brightness of the image signal provided from the signal amplifying and adjusting unit by varying its level in accordance with a brightness control signal; analog-to-digital converter for converting an analog signal provided from the clamp to a digital signal to output it; a microcomputer for detecting a horizontal/vertical synchronous signal provided from the computer to separate it, detecting a graphic display mode by using a frequency of the separated horizontal/vertical synchronous signal; and recognizing a resolution in accordance with the detected graphic display mode; and a graphic controller for discrete-cosine transforming and reversely converting the frequency of the image signal output from the analog-to-digital converter and applying it to the LCD panel in order to convert the resolution recognized by the microcomputer to a resolution suitable to a monitor of the LCD, by which in case that the resolution of the input image is low, it is converted to a resolution fitting the LCD monitor through the DCT and IDCT, thereby remarkably improving the picture quality.