Computer graphics processing and selective visual display system – Plural display systems – Diverse systems
Reexamination Certificate
2007-02-27
2007-02-27
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural display systems
Diverse systems
C345S204000
Reexamination Certificate
active
10636160
ABSTRACT:
In order to automatically distinguish a type of cable connected to a display apparatus, and transmit appropriate specification information to a host, when a host10and a display apparatus100are connected via a DVI-D to DVI-D cable14for digital signal, a DDC 5V from the host is applied to an emitter of a detection transistor19, and a lower voltage due to a resistor17is applied to its base so that the detection transistor turns on. A collector voltage thus becomes an H level so that a multiplexer21is switched to the side of a non-volatile memory23in which a digital EDID is stored. When they are connected via a D-Sub to DVI-I conversion cable15for analog signal, a DDC 5V terminal and an HPD terminal of the cable are short circuited, so the detection transistor turns off, the collector voltage becomes an L, and the multiplexer is switched to the non-volatile memory side in which an analog EDID is stored.
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Abdulselam Abbas I.
NEC - Mitsubishi Electric Visual Systems Corporation
Scully , Scott, Murphy & Presser, P.C.
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