公开(公告)号：JPH07219481A

公开(公告)日：1995-08-18

申请号：JP874094

申请日：1994-01-28

Applicant: IBM

Inventor： SUZUKI HIDEFUMI ,  FUNAKOSHI AKIHIRO ,  MIWA ISAMU

IPC: G02F1/133 ,  G09G3/20 ,  G09G3/36 ,  H03M1/08 ,  H04N3/12 ,  H04N5/66

Abstract: PURPOSE: To drive a liquid crystal panel without generating a flicker or noise on a screen. CONSTITUTION: An adding circuit 26 adds a noise component of an analog signal detected by a filter 24 to a reference voltage from a power source 16 and a phase adjusting circuit 28 adjusts the phase of the reference voltage to which the noise component is added. A circuit 12 holds the analog signal and outputs it to comparators 14a-14n. The reference voltage from the circuit 28 is divided by resistances 18a-18n and outputted as threshold voltages TVa- TVn to the comparators 14a-14n. The comparators 14 compares the inputted analog signal with the voltages TV and outputs a specific signal to an encoder 20 when the analog signal is larger than the voltages TV. The encoder 20 digitizes the signals from the comparators 14 and applies them to electrodes of the liquid crystal panel.

公开(公告)号：CA2105421A1

公开(公告)日：1994-04-30

申请号：CA2105421

申请日：1993-10-22

Applicant: IBM

Inventor： FUKUSHIMA AKIRA ,  MIWA ISAMU ,  KAWASHIMA NOBUYUKI

IPC: G06F1/00 ,  G06F1/16 ,  G06F12/14 ,  G06F21/06 ,  H05K7/14

公开(公告)号：JPH07210116A

公开(公告)日：1995-08-11

申请号：JP33728293

申请日：1993-12-28

Applicant: IBM

Inventor： MACHINO HARUHIRO ,  FUNAKOSHI AKIHIRO ,  MIWA ISAMU

IPC: G02F1/133 ,  G09G3/20 ,  G09G3/36

Abstract: PURPOSE: To drive a liquid crystal panel without causing any flickering in pictures no producing any noise. CONSTITUTION: Analog signals (R) are inputted to sample-and-hold circuits SH through an amplifier 14. The voltage values of the analog signals held by the corresponding sample-and-hold circuits SH1,..., SH(n/2) when the first-half clock signal is inputted are outputted to the sample-and-hold circuit SH(n/2+1) after the voltage values are added to each other by means of an adder 16 and the sum is divided by 'n/2' by means of a divider 18. The voltage values of the analog signals held by the corresponding sample-and-hold circuits SH(n/2+2),... SH(n+1) when the second-half clock signal is inputted are outputted to the sample-and-hold circuit SH(n+2) after the voltage values are added to each other by means of an adder 16' and the sum is divided by 'n/2' by means of a divider 18'. The outputs from the circuits SH(n/2+1) and SH(n+2) are added to each other by means of an adder 24 and the sum is divided by '2' by means of a divider 26. A driver circuit applies a voltage across the corresponding electrodes of a liquid crystal panel in accordance with the output of the divider 26.

公开(公告)号：JPH06149409A

公开(公告)日：1994-05-27

申请号：JP29102892

申请日：1992-10-29

Applicant: IBM

Inventor： FUKUSHIMA AKIRA ,  KAWASHIMA NOBUYUKI ,  MIWA ISAMU

IPC: G06F1/00 ,  G06F1/16 ,  G06F12/14 ,  G06F21/06

Abstract: PURPOSE: To take security measures for an internal electronic device such as a storage device even in the state of detaching a portable computer by providing a key mechanism for locking an install system for portable computer so that the internal electronic device is not detached from its main body. CONSTITUTION: In the state shown by Figure, a propeller 42 is directed vertical, an interlock body 55 is positioned closest to a key mechanism 18 inside a prescribed moving range, and a stopper 50 is released from the interlock body 55 and can be freely moved up and down. When fitting the portable computer to the install device, the stopper 50 is pushed in downward and latched by a latch mechanism 54. At the key position shown by the Figure, the portable computer can be attached and detached and a main body cover can be freely detached. At such a position, however, a key 44 can not be ejected from a key hole 46. When the stopper 50 is pulled out ant the key mechanism 18 exists at the 2nd position, the computer can not be attached/detached, the cover can not be detached, either and the electronic device is protected.

公开(公告)号：CA2105421C

公开(公告)日：1997-06-24

申请号：CA2105421

申请日：1993-10-22

Applicant: IBM

Inventor： FUKUSHIMA AKIRA ,  MIWA ISAMU ,  KAWASHIMA NOBUYUKI

IPC: G06F1/00 ,  G06F1/16 ,  G06F12/14 ,  G06F21/06 ,  H05K7/14

Abstract: A key mechanism is provided for locking an internal electronic apparatus in the condition under which the apparatus is prevented from being detached from a base body of a desktop base for a portable computer, so that the internal electronic apparatus such as a storage device cannot be freely taken away from the desktop base even if the desktop base is left alone without being docked with the portable computer. Further, a key mechanism is provided for locking a desktop base for a portable computer in the condition under which power supply for the desktop base for a portable computer is not turned on even if the power switch for the desktop base for a portable computer is turned on, so that data in an internal storage device cannot be stolen or destroyed since power is not supplied to the storage device even if access to the storage device is attempted by freely docking another portable computer to the desktop base.