Overview
- The reports published Monday say LG Display is working on a five‑layer, or penta‑tandem, OLED structure that adds a third blue emitting layer to the existing blue‑green‑blue‑red stack.
- Apple has asked LG Display and Samsung Display for information on 24‑inch OLED panels with target specs near 218–220 pixels per inch and about 600 nits of brightness, according to supply‑chain reporting.
- Engineers favor multi‑stack OLED because stacking spreads electrical load across emitters, which lets panels reach higher luminance without overdriving tiny pixels and reduces the risk of image retention or burn‑in.
- Adding a fifth emitting layer raises organic material use and makes deposition more complex, which suppliers say will hit manufacturing yields and raise costs, so panel developers are targeting 2028 for development and 2029 at the earliest for a consumer iMac.
- Apple is still expected to ship a nearer‑term LCD iMac refresh with a new processor this year while OLED remains a longer‑term, higher‑cost push that competes with Samsung’s QD‑OLED and other supplier approaches.