Device and method for video signal transmission clock generation

Abstract

The invention discloses a video signal transmission clock generation device and method. The device has a video clock interface, a video data interface, a configuration parameter interface, an input clock frequency accurate detection unit, an upper configuration module and a clock reconfiguration unit. The input clock frequency accurate detection unit generates a reference clock, carries out stabilization, phase modulation, clock domain adjustment and frequency doubling on a received input video clock to generate a synchronous detection clock, generates a unit time signal according to the reference clock, and detects and obtains an input clock frequency value according to the reference clock, the synchronous detection clock and the unit time signal when there is a continuous and stable video clock input. The parameters of upper configuration are obtained through the configuration parameter interface, and clock reconfiguration is carried out according to the configuration parameters, a pre-stored PLL parameter table and the input clock frequency value to obtain a configurable video signal transmission clock. Through the device and the method, a video signal transmission clock with the frequency and phase configured flexibly can be obtained according to the video signal clock input at any frequency and the demand.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal module detection, and in particular relates to a video signal transmission clock generation device and method. Background technique [0002] When inspecting LCD modules in the production line, it is often necessary to detect the dot screen effect of the module under different field frequencies and different image clock frequencies, and frequently switch between different field frequencies and clock frequencies. However, when the existing image signal generating equipment is powered on, the field frequency and image clock of the output image are fixed and cannot be switched flexibly. Therefore, a device that can flexibly adjust the output clock frequency and phase according to the configuration is needed to meet LCD module testing requirements. Contents of the invention [0003] In view of the above defects or improvement needs of the prior art, the present invention provides a video sign...

AI Technical Summary

Problems solved by technology

However, when the existing image signal generating equipment is powered on, the field frequency and image clock of the output image are fixed and cannot be switched flexibly. Therefore, a device that can flexibly adjust the output clock frequency and phase according to the configuration is needed to meet LCD module testing requirements

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