PORTABLE COMPUTER AUTOMATICALLY LOWERING BRIGHTNESS OF BACKLIGHT LAMP ACCORDING TO TILT ANGLE OF DISPLAY PART, AND CONTROLLING METHOD THEREOF

摘要

Purpose: automatically according to display part pivot angle reduce a backlight lamp brightness a portable computer and its Mitigation options the time one used by the way that the automatically droning brightness of backlight lamp is arranged to lengthen a battery according to the pivot angle of display part. Construction: a tilt angle detector (10) detects the pivot angle of display part to a main body. One microcomputer (20) makes the brightness of an inverter (12) reduction by one backlight lamp (14), if the pivot angle detected by detector is below a predetermined level. The brightness of pivot angle and backlight lamp that one user interface (16) allows a user to select for pivot angle, for an automatic brightness control circuit function of backlight lamp, and an inclined direction of display equipment. An initial tile angle and an initial luma values are stored in the previous initial information storage (18) of the brightness reduction of backlight lamp.