PVLC (Pixel-level Visible Light Communication) projector, which can embed invisible information on images, displays images and information in time division. Therefore, it has a problem that the contrast ratio of images deteriorates as the amount of information increases. This paper proposes a bright control method that improves the contrast ratio by both blinking the light sources for the entire screen and switching the DMD for individual pixels in the information projection part.
The improvement of the contrast ratio or the amount of information is shown and the image quality is checked using a PVLC projector.