Both factory settings and battery power contribute to the Sony VAIO computer screen brightness. Manually adjust either the factory settings or the battery power to brighten the computer screen. The lower the brightness, the more you conserve battery power. Adjust the brightness to help reduce eye strain, provide a clearer picture in direct sunlight or add visual clarity to documents and web pages. Do not use the screen brightness as a source of light; always have a second light source, such as a lamp, nearby. Writer Bio
