Abstract: A portable computer having a primary and secondary displays is disclosed. The portable computer includes a step value storage device for storing a set of manipulation step values for simultaneously controlling the luminance of the primary and secondary displays. The portable computer also includes a first luminance table and a second luminance table. The first luminance table stores a set of first control step values that corresponds to a luminance value to be set to the primary display for each of the manipulation step values. The second luminance table stores a set of second control step values that corresponds to a luminance value to be set to the secondary display for each of the manipulation step values so that the luminance values set for the secondary display becomes substantially identical to the luminance values set for the primary display within a range of a predetermined number of consecutive manipulation step values.

Abstract: A computer system, display device, display controller, and image processing method are described which provide high visibility and usability. A portion of an image displayed on a display screen of the display device is enlarged in one direction and the enlarged image is displayed in a window. In one example, a portion of the image displayed in the display is enlarged in the vertical direction when the text runs along a horizontal direction.

Abstract: An information handling apparatus and screen display control method for appropriately controlling a screen display when a changed output destination for a display signal is selected from among a plurality of display devices having different resolutions.