I am not clear on the use of the vertical blank (vblank) on display panels.
Could some one please explain
- Significance of vblank ?
- How it can be utilized in the display subsystem?
need of vblank in Display subssytem
1.3k Views Asked by Mukesh At
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Vertical Blanking Interval
A legacy from the olden days of Cathode Ray Tube (CRT) displays.
As nothing is displayed onscreen during the VBI, this portion of the video signal can be used for the purposes of carrying other data information. Indeed, various test signals, Closed Captioning, Teletext, copy-protection mechanisms, and various forms of digital data all exploit the opportunity afforded by the VBI.
In current generation digital display systems, VBI time-period ( VSYNC or VBLANK interrupt) is used to swap display buffers when using double or triple buffering. This way one can completely avoid onscreen tearing artifacts.