round shaped ic in calculators and other devices

[devil6600]

i have seen in many calculators and other cheap hand held game consoles (especially from china) that they use a round shaped IC inside instead of a square or rectangular. why is it so and why round shaped?
thanks

 

[bigdogguru]

Like this?



epoxy/resin casted IC

---------- Post added at 04:22 ---------- Previous post was at 04:18 ----------

Moisture resistance, high temp for reflow ovens, etc.

 

[KJ6EAD]

It's called a chip-on-board (COB) device. Here's a brief description: Chip-on-Board (COB); Direct Chip Attachment (DCA) and a more detailed tutorial: Die Products Consortium: Chip on Board Tutorial and here's a typical manufacturer of these products: **broken link removed**.