A LC panel for use in a projection LCD device includes a source driver IC operating in a frame-inversion driving scheme. The luminance gradient caused by the frame-inversion driving scheme in the active-matrix substrate is cancelled by the luminance gradient caused by the heat generated by the source driver. A heat adjusting element is provided for the source driver IC, wherein the heat adjusting element is either a radiator or a heater depending on the relationship of the magnitude between the luminance gradients caused by the frame-inversion driving scheme and the source driver IC.