Circuit for extracting field synchronizing signal from LVDS (Low Voltage Differential Signaling) signal and processing field synchronizing signal

Abstract

The invention relates to a circuit for extracting a field synchronizing signal from LVDS (Low Voltage Differential Signaling) signals and processing the field synchronizing signal. The circuit comprises a chip of an LVDS signal / digital RGB (Red, Green and Blue) signal, and the signal input end of the chip of the LVDS signal / digital RGB signal is connected with the LVDS signal output end of an image card through a resistor. The invention realizes that the field synchronizing signal is extracted from the signals with diverse input signals and processed into a required reference field synchronizing signal applied to a phase-lock frequency multiplier circuit.

Description

technical field [0001] The present invention relates to the field of display circuit technology, more specifically, to a circuit for extracting field synchronous signals from diverse signals input by LCD, a level conversion and pulse shaping circuit, and a switch control circuit for outputting phase-locked and multiplied signals , the invention converts the method of extracting field synchronization from diversity signals input by LCD to extracting from LVDS signals, thereby making it possible and practical to extract field synchronization signals. Background technique [0002] If the input signal of the display is a single VGA signal, the field synchronous signal can be directly taken out from the signal, and it can be used as the reference signal of the phase-locked circuit. But in most cases, the input signals of the display are diverse, so how to extract the required field synchronization signal from these diverse input signals becomes the key to the application of phase...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a circuit for extracting and processing the field synchronization signal from the LVDS signal in view of the existing defect that the field synchronization signal cannot be extracted from the input signal with a variety of signals and necessary processing circuits

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