Abstract: A camera service port has an automatic termination for connecting to a near-side monitor. The camera service includes an audio jack and a phone jack. The audio jack includes first and second terminals for receiving signals from a camera and connecting to the near-side monitor. The phone jack includes a first connector coupled to the camera, an equivalent resistor coupled to the first connector, and a second connector coupled to the camera. The second connector is flexible to connect to the first terminal without being connected to an equivalent resistor. When the audio jack is plugged into the phone jack, the first terminal is coupled to the second connector and the second terminal is coupled to the first connector for receiving the signal from the camera. When the audio jack is not plugged into the phone jack, the equivalent resistor is coupled between the second connector and the first connector.

Abstract: Display control methods and systems are provided. The display control system includes a panel including a plurality of pixels, and a processor. The processor provides a video signal having a high level to the pixels, and periodically forces at least one of the pixels to be OFF.

Abstract: A camera service port has an automatic termination for connecting to a near-side monitor. The camera service includes an audio jack and a phone jack. The audio jack includes first and second terminals for receiving signals from a camera and connecting to the near-side monitor. The phone jack includes a first connector coupled to the camera, an equivalent resistor coupled to the first connector, and a second connector coupled to the camera. The second connector is flexible to connect to the first terminal without being connected to an equivalent resistor. When the audio jack is plugged into the phone jack, the first terminal is coupled to the second connector and the second terminal is coupled to the first connector for receiving the signal from the camera. When the audio jack is not plugged into the phone jack, the equivalent resistor is coupled between the second connector and the first connector.

Abstract: Monitors with multiple video inputs and one video output are provided. The monitor comprises an output connector and a processor. The processor receives video signals from a plurality of video sources, and combines the video signals to generate a composite video signal. The processor outputs the composite video signal via the output connector.

Abstract: Monitors with cameras are provided. The monitor comprises a display unit, a plurality of cameras, and a processor. Each of the cameras captures at least one picture. The processor receives the pictures from the cameras, and simultaneously displays the pictures in the display unit.

Abstract: A single compact air cleaner unit includes a motor and fan assembly, a mechanical pre-filter, an electrostatic precipitator, a main filter cartridge which is easily removable and which contains both a synthetic mesh media with electrical charges embedded therein and a plastic screen impregnated with activated carbon powder, ionizing needles positioned adjacent a fresh air outlet, an air quality sensing device having an adjustable control for selecting a level of air quality to be achieved, and an automatic control cooperatively associated with the air quality sensing device to keep the unit energized as long as the air being sampled does not meet the selected air quality level.

Abstract: An adjustable frame includes an outer tubular member and an inner cylindrical member disposed in longitudinally adjustable relation, the inner member being of substantially smaller diameter than the interior surface of the outer member so as to provide an annular space between the two members. Inner and outer adapter rings are disposed about the inner cylindrical member within the annular space. The adapter rings have longitudinally tapered mating surfaces for providing a cam action. A sleeve is threadedly supported from the outer tubular member and engages one of the adapter rings for moving it axially relative to the other ring to thereby create a radial expansion force within the annular space, thus locking the inner cylindrical member in a fixed longitudinal position relative to the outer tubular member.