Provided are an image signal compensation apparatus and a liquid crystal display including the same. The functionalized MBS is useful as an impact modifier in engineering resins, and especially in blends of engineering resins, particularly where the blend contains both functional and non-functional resins. One such system includes an inputoutput connection in communication with the loop, a processor operable in at least two states, a means for sensing demand for simultaneous usage of the loop, and a means for controlling the state. A transverse beam is fixed between the second ends of the adjusting members and positioned under the bottom of front end of the tread platform, whereby the stop block of the tread platform can abut against the transverse beam. If a dimming ratio of the light source unit is lower than the first ratio, the ON width of the second switching device is regulated with the ON width of the first switching device held at a lower limit. A phosphor layer has a shielding portion formed in the boundary between respective areas facing the respective light emitting surfaces of the adjacent semiconductor light emitting elements.