US 2003/0172211 A1Published application

Dual input/output automatic selection device

OwnerChien-Pang Huang, Hei-Tai Honginventors

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Abstract

A dual input/output automatic selection device is disclosed to provide an input/output interface between projectors and peripheral products generating VGA (Video Graphics Array) signals. The dual input/output automatic selection device comprises an input/output unit and an image processing unit. The input/output unit has two VGA ports, each of which is connected to a switch circuit having a VGA image data input path and a VGA image data output path. Each of the two VGA ports serves as either an input port or an output port depending on whether the VGA image data input path or the VGA image data output path is activated. The image processing unit has a switch circuit by which VGA image data from either of the two VGA ports is received for processing. Compared to the conventional unidirectional single input/output interface, the dual input/output automatic selection device has greatly improved the connection accessibility and mobility between the projectors and peripheral products.

Claims8

Dependent claims

A dual input/output automatic selection device, comprising:

an input/output unit for transmitting VGA image data, providing with a first VGA port, a second VGA port, a first switch circuit connected to said first VGA port and having a first VGA image data input path and a first VGA image data output path, a second switch circuit connected to said second VGA port and having a second VGA image data input path and a second VGA image data output path, a first driving circuit connected to said first VGA image data output path and said second VGA image data input path, and a second driving circuit connected to said first VGA image data input path and said second VGA image data output path;
and
an image processing unit for detecting and processing the VGA image data transmitted from said input/output unit, providing with a third switch circuit having a first VGA image data path connected to said first VGA image data input path and a second VGA image data path connected to said second VGA image data input path, and a signal converter connected to said third switch circuit.

Dependencies are inferred from the claim text.