Does anyone know of a single-IC video interface?

I have in mind a chip that behaves like an alpha-numeric LCD display,
except with a composite (or some other) video output. You'd be able to send
cursor commands to it, write characters to screen positions, read them
back, etc, all via (say) an I2C or 8-wire interface. 80x24 characters would
be nice.

I have a datasheet for an STV9425 that sort-of fulfills this, but I'm
wondering if there are any others out there.

Any comments appreciated.

Alec