Patent ID: 7928998

Claim:
A apparatus adjusting image quality in a liquid crystal display, comprising: a brightness adjuster that adjusts a value of a brightness component of input video data from a system and outputs the adjusted brightness component; a brightness comparator that compares a value of the adjusted brightness component of input video data from the brightness adjuster with a predetermined brightness reference range, between high and low value reference brightness components, determines whether or not a value of the adjusted brightness component from the brightness adjuster is within the predetermined brightness reference range, outputs the adjusted brightness component from the brightness adjuster when the value of the adjusted brightness component from the brightness adjuster is within the predetermined brightness reference range, and outputs the adjusted brightness component within the predetermined brightness reference range when the value of the adjusted brightness component from the brightness adjuster is outside the predetermined brightness reference range; and a brightness controller, connected to the brightness adjuster and to the brightness comparator, that returns the adjusted brightness component to the brightness adjuster when a value of the adjusted brightness component is outside the predetermined brightness reference range based on the comparing result of the brightness comparator, wherein the brightness adjuster further adjusts the adjusted brightness component returned by the brightness controller until the brightness adjuster outputs an adjusted brightness component that is within the predetermined brightness reference range, and wherein the brightness adjuster multiplies the brightness component by a predetermined signal gain to generate the adjusted brightness component and the further adjusted brightness component.