Abstract: According to one embodiment, an information processing apparatus includes a display unit pivotally installed on a housing and including a magnet unit, a magnetic sensor unit incorporated in the housing to detect a movement of the magnet unit, a conversion unit which converts a magnetic force detected by the magnetic sensor unit into a pulse signal having a pulse width, a detection unit which detects an angle made by the display unit and the housing based on the pulse signal converted by the conversion unit and having the pulse width, a storage unit which stores table information storing an operation corresponding to a predetermined angle, and an operation unit which performs the predetermined operation based on the table information when the detected angle has increased to the predetermined angle, and performs the predetermined operation based on the table information when the detected angle has decreased to the predetermined angle.

Abstract: According to one embodiment, there is provided a computer including a display to display a video in one of a normal mode in which the video is displayed according to a progressive scheme and a multi-field drive mode in which the video is displayed according to an interlace scheme, and a control device to supply specification information specifying one of the normal mode and the multi-field drive mode, to the display.

Abstract: A battery charge circuit using a constant voltage/constant current to power charge a plurality of battery packs, a current detection circuit to detect a charge current according to a predetermined value, and control mechanisms to maintain a constant voltage charge mode when the charge current value drops below a set value within the battery pack.

Abstract: In a battery-driven portable computer, a battery pack is constituted by m battery sets connected in series each including n lithium-ion secondary battery cells connected in parallel. A voltage monitor for monitoring the voltage of the terminal electrode of each battery set and a charger for independently appropriately charging each battery set in accordance with a monitor result are arranged, thereby realizing battery driving by a lithium-ion secondary battery pack having a large capacity. A computer system monitors the voltages of the battery cells which are part of a secondary battery by comparing the battery voltages with a predetermined voltage value in order to detect overdischarge (undervoltage) or overcharge (overvoltage), outputs this information outside of the battery pack, and terminates processing prior to a circuit disconnect.

Abstract: In a battery-driven portable computer, a battery pack is constituted by m battery sets connected in series each including n lithium-ion secondary battery cells connected in parallel. A voltage monitor for monitoring the voltage of the terminal electrode of each battery set and a charger for independently appropriately charging each battery set in accordance with a monitor result are arranged, thereby realizing battery driving by a lithium-ion secondary battery pack having a large capacity.