Small form factor video conerter (DVI to VGA)
Original Publication Date: 1999-Dec-01
Included in the Prior Art Database: 2003-Jun-19
Disclosed is a device for converting the analog signals within the Digital Visual Interface (DVI) connector to the traditional 15-pin Video Graphics Array (VGA) connector. Unlike similar devices which utilize a cable connection between the two connectors, this device consists of two vertical board-mounted connectors attached to a very small Printed Circuit Board (PCB). The advantages to this approach include a simpler method of manufacture, and a much smaller form factor and profile. Figure 1 shows an external view of the final device. Although dimensions are not shown, the device has a width of 1.468", a length of 1.62", and a height of 1.084". This corresponds roughly to the inner dimensions of the NLX recess as defined by Chapter 5 of the AGP 2.0 specification [*]. As a result, this converter can attach to an NLX form factor PC without extending from the rear of the chassis. These dimensions do not preclude attachement to an ATX form factor graphics adapter, so long as there is no obstruction immediately to the left of the AGP graphics adapter (as viewed from the rear of the PC). Figure 2 details the construciton of the device. All electrical connections take place within the PCB. A properly designed PCB with Ground planes on outer layers and signal planes on inner layers provides adequate shielding for Electro-Magnetic Compatibility testing. Plastic or ruberized covers provide a non-conductive finish, and two thumb screws attach the device to the PC.