Patent Number: 6,166,777

Title: Picture-in-picture type video signal processing circuit and method of using the same for a multi-picture display circuit

Abstract: The PIP type video signal processing circuit for a multi-picture display circuit in which a sub-channel video signal is compressed in accordance with a discriminated mode and a reading period is synchronized with a period of the video signal of a main-picture region when the sub-picture video signal is selectively selected of the TV video signal provided from the TV and the PC video signal provided from the PC. The present invention comprises a mode discriminator/timing generator for discriminating a mode in accordance with a synchronizing signal of a sub-picture video signal, producing a control signal for synchronizing horizontal and vertical frequencies of sub-picture video signal with a main-picture video signal, and separating synchronizing signals from the synchronizing signal of the sub-picture video signal, a video compressor for compressing the input TV video signal or input PC video signal with a predetermined pattern, a dual-port memory for storing the sub-picture video signal provided from the video compressor and outputting the sub-picture video signal by the synchronizing control signal.

Inventors: Ock; Sang Soo (Kyoungsangbuk-Do, KR)

Assignee: LG Electronics Inc.

International Classification: H04N 5/45 (20060101); H04N 005/45 ()

Expiration Date: 12/26/2017