I worked at a company that made video titlers in the 80s. They tried all kinds of interesting memory technology including bubble memory and CCD memory. I remember they deployed CCD shift register memory to customers, but it was pretty error prone- your text would get corrupted over time.

They made a 68000-based high resolution titler with fast SRAM for the display refresh memory. This would have been crazy expensive except that the image was stored in compressed format, and decompressed on the fly during display, so they only needed something like 64KB. It looked great, but composing the image (from annotated text) was very slow. I think Chyron just used lots of DRAM in their similar products (pretty sure they used 8086).