An inadvertent off-hook apparatus for use in a telephone system having a handset for automatically restoring an inadvertently off-hook telephone to an on-hook in order to receive an incoming call. The apparatus comprises a current sensing unit comprising a photo-coupler coupled to one of a tip and a ring terminal of the telephone line, for sensing variations of current of the telephone line in response to an incoming call and detecting a handset misplacement signal indicating that the telephone ...

Disclosed is an apparatus for adjusting the height of the seat cushion for a vehicle which includes a rubber tube positioned under the seat cushion, a pressure sensing means positioned under the rubber tube and moving upward or downward depending upon the load supplied on the seat cushion, a first switch and a second switch selectively operating a compressor and a vacuum pump depending upon a signal from the pressure sensing means, and a limit switch cutting off the first switch on contact with ...

A car seat, which is rotatable and linearly movable. The car seat has a lower plate having a centrally located pinion on the top surface and parallel movable rails on the bottom side. The movable rails are linearly movable on support rails fixed onto the floor of a car body. An upper plate is rotatably connected to the lower plate by a connecting shaft with a predetermined space therebetween and having a seat cushion thereon. A swivel mechanism is provided between the lower and upper plates and ...

An improved apparatus for combining frequencies which is capable of generating a constant frequency when an external variation is applied thereto by implementing each block using a differential circuit, whereby it is adaptable to a mobile communication system, includes a phase frequency detector for comparing an input signal with a reference signal and for detecting a frequency or a phase error; a filter for differentially amplifying an output of the phase frequency detector for generating a low...

A fixing structure for fixing a color wheel to a base of a projector is provided. The color wheel is rotatably installed and includes a color rotating disc having a plurality of color filters selectively transmitting light of a predetermined wavelength, and a driving source which drives the color rotating disc. The fixing structure includes a first cover member coupled to a base, and a second cover member coupled to the first cover member and together therewith encompassing the color wheel. A br...

Test thin film transistors are provided outside of the pixel region of an LCD panel that includes an array of pixel thin film transistors and intersecting arrays of spaced apart data lines and gate lines connected to the array of pixel thin film transistors. A respective test thin film transistor is connected to a respective one of the data lines or gate lines. At least subgroups of the test thin film transistors are commonly connected to provide common energization of subgroups of data lines or...

Disclosed is a video signal processing system for outputting video signals for driving monitors during one period of clock signal. The system includes: a clock signal (CLK) supply part for outputting CLK for transmitting video signal; a monitor controller for outputting memory access signal (MA) by the period of CLK; a memory buffer for outputting data signal according to MA; latch circuits for latching data signal, dividing into multiple data during one period of CLK and outputting the latched ...

A portable terminal device, which employs a display unit utilizing a holographic screen, a main housing, a holographic screen, and an optical system. The holographic screen is disposed at a predetermined portion of the main housing while being exposed to an exterior of the main housing. The holographic screen optically displays information by means of image-light which is projected to the holographic screen. The optical system is spaced apart from the holographic screen and provides the holograp...

An authentication system and method therefor is provided, in which a dedicated system is installed to allow only a computer system which is monopolistically and exclusively supplied by a company operating an information providing server to be used to access the server. Here, the user computer includes an authentication system which generates a specific registration code for the system. The authentication system includes the user computer for generating a registration code for authenticating the ...

Disclosed is a backlighting device for a dual LCD (Liquid Crystal Display). The backlighting device includes a circuit board with a through hole; a backlighting illumination device situated within the hole for radiating light in a first direction substantially perpendicular to a first face of the circuit board and in a second direction substantially perpendicular to a second face of the circuit board; a main LCD being situated on one face of the backlighting illumination device in the first dire...