Processing method of field synchronizing signals, and control circuit

Abstract

The invention discloses a processing method of field synchronizing signals, and a control circuit, for reducing time errors of field synchronizing signals generated by multiple display devices and reducing black screen and scintillation phenomena. The method comprises the following steps: obtaining external field synchronizing signals and pixel clock signals; counting the signal quantity of current pixel clock signals within the signal period of the external field synchronizing signals to obtain a target signal quantity, and comparing the target signal quantity with a preset signal quantity; and determining whether a comparison result satisfies preset output signal conditions, if not, according to the comparison result, adjusting the clock frequency of the current pixel clock signals to obtain a target clock frequency, then executing counting an comparison by taking the adjusted pixel clock signals as the current pixel clock signals, and if so, outputting local field synchronizing signals according to the current pixel clock signals and preset rules.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a processing method and a control circuit of a field synchronous signal. Background technique [0002] In the field of video display control, field synchronization signal (VS) and pixel clock are several common control signals. The field synchronization signal provides an identification for each picture signal, which is convenient for display devices to identify, receive and display each picture. In a multi-screen splicing display system, each display device has an independent synchronous signal generator. In order to make multiple display devices display synchronously, the multi-screen splicing display system inputs an external field synchronization signal to multiple display devices, and synchronizes the field synchronization signals of all display devices to the same field synchronization signal. [0003] At present, the processing method of the local field synchronization si...

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Problems solved by technology

[0004] Since the preset pixel clock frequency of each display device is different, in the multi-screen splicing display system, the signal number of the pixel clock signal is different in the signal period of the external field synchronization signal, so the local field synchronization signal generated according to different pixel clock signals There is a time error. When the display device displays image data signals according to different field synchronization signals, black screen and flickering will appear, resulting in poor viewing experience for users

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