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Circuit Structure of Dual Video Signal Sequence Generator with External Synchronization Function

A technology for generating circuits and synchronizing signals. It is used in television, electrical components, image communication, etc. It can solve the problems of video asynchrony, black screen or splash screen, etc., and achieve the effect of eliminating black screen or splash screen.

Active Publication Date: 2020-10-20
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to frequently switch the display video in the aircraft cockpit display system, but because the frames of the switched videos are out of sync, black screen or flickering may appear when the video is switched

Method used

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  • Circuit Structure of Dual Video Signal Sequence Generator with External Synchronization Function
  • Circuit Structure of Dual Video Signal Sequence Generator with External Synchronization Function

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Embodiment Construction

[0014] The technical solutions of the present invention will be described in further detail below in conjunction with specific embodiments and drawings.

[0015] See figure 1 . The VESA (Video Electronics Standards Association, Video Electronics Standards Association) video timing standard defines video to be composed of frame synchronization, line synchronization, data validity, video data signals and pixel clock signals. The VESA video timing standard defines the video timing to consist of horizontal synchronization time, horizontal back porch time, horizontal effective time, horizontal total time, vertical synchronization time, vertical back porch time, vertical effective time and vertical total time. The horizontal effective time and vertical effective time values ​​are the video horizontal and vertical resolution values.

[0016] figure 2 It is the circuit structure diagram of the present invention.

[0017] A dual-channel video signal timing generation circuit structure wi...

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Abstract

The invention belongs to an integrated circuit design technology, and provides a dual-channel video signal time sequence generation circuit structure with an external synchronization function. In order to meet requirements of a graphics processing unit for dual-channel video output and the external synchronization function, the dual-channel video signal time sequence generation circuit structure can simultaneously generate two channels of output video signals conforming to VESA (Video Electronics Standards Association) video time sequence standards and support synchronous refresh of output video frames with external frame synchronization signals. In addition, the dual-channel video signal time sequence generation circuit structure has a function of enabling the two channels of output videoto keep synchronization or simultaneously keep synchronization with the external frame synchronization signals, so that a phenomenon of a blank screen or a flash screen which possibly occurs in the switching between different video signals can be effectively eliminated when switching is required to be performed between the two channels of output video and video signals which keep synchronizationwith the external synchronization signals, thereby realizing seamless switching between the video signals.

Description

Technical field [0001] The invention belongs to integrated circuit design technology, a dual-channel video signal timing generating circuit structure with external synchronization function. Background technique [0002] Graphics processor usually has dual-channel video output function, which can output two channels of video at the same time. The two channels of video can have different resolutions, frame frequencies and video data for different applications such as dual-channel independent display or dual-channel extended display. Scenes. In the aircraft cockpit display system, the display video needs to be switched frequently, but the frames of the switched videos are not synchronized, which may cause a black screen or a flickering screen when the video is switched. Summary of the invention [0003] The purpose of the present invention is to propose a dual-channel video signal timing generation circuit structure with external synchronization function, eliminate the black screen ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/06H04N5/08H04N5/765
CPCH04N5/06H04N5/08H04N5/765
Inventor 颜哲田泽许宏杰卢俊王婷马超
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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