Not sure if they will be up in time for SDCC, but the Convention Center is going more high tech with digital signs / video walls:
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LoginThe digital signage, which is slated to begin installation this spring, allows the San Diego Convention Center the opportunity to replace static signage, including banners, overhangs and poster boards, with a modern, visually appealing, real-time messaging platform.
The signage plan will include both static and portable LED videowalls. The main signage displays and will be located in four of the lower lobbies of the facility.