Apple continues its systematic shift of all device lines to organic light‑emitting diode (OLED) matrices. On August 10, 2026, it became known that LG Display has begun developing an innovative five‑layer tandem OLED panel specifically for future iMac all‑in‑one computers.
Apple’s OLED Transition for iMac
The current 24‑inch iMac models use high‑quality IPS Retina 4.5K LCDs. Moving to OLED promises deeper blacks, virtually infinite contrast, and a significant boost in energy efficiency.
Technical Details of the 5‑Layer BGBRB Structure
- Three blue emissive layers (B): Provide increased operational lifespan and resistance to burn‑in of static macOS interface elements such as the Dock and menu bar.
- One green emissive layer (G): Substantially raises peak and sustained screen brightness.
- One red emissive layer (R): Guarantees accurate and natural colour reproduction for professional photo and video work.
Apple’s Requirements for Next‑Gen Displays
- Diagonal and resolution: 24 inches (or 27 inches for the higher‑end model) with 5K resolution.
- Pixel density: High Retina standard of 218–220 PPI.
- Brightness level: Stable long‑term brightness of at least 600 nits (versus 500 nits in current LCD models).
- Subpixel structure: Use of an RGB stripe pattern to ensure maximum text sharpness in macOS.
Comparison of Current and Future iMac Displays
- Matrix type: Current – IPS LCD with LED backlight; Test – 4‑layer tandem OLED (BGBR); Future – 5‑layer tandem OLED (BGBRB).
- Pixel density: Current – 218 PPI; Test – 220 PPI; Future – 218–220 PPI.
- Maximum brightness: Current – 500 nits; Test – ~400–500 nits; Future – 600 nits.
- Contrast ratio: Current – 1000:1 (standard); Test – Infinite (OLED); Future – Infinite (OLED).
- Burn‑in protection: Current – N/A; Test – Basic; Future – Maximum (three blue layers).
Timeline and Roadmap
Developing and scaling high‑density five‑layer OLED panels (220 PPI) for large diagonals remains a major engineering challenge. Testing of 27‑inch test samples on Samsung and LG lines is expected to continue throughout 2026‑2027.
Final development of OLED panels for the new iMac should be completed by 2028, with a full market launch of the updated all‑in‑one anticipated for 2028‑2029.
Xpert Take
Apple’s move to a five‑layer OLED panel addresses the long‑standing brightness and burn‑in limits that have prevented OLED adoption in desktop monitors. By securing a custom stack from LG Display, Apple can differentiate its iMac line with superior picture quality while maintaining the Retina sharpness macOS users expect. The 2028‑2029 timeline suggests the company is willing to invest heavily in next‑gen display tech, which could pressure competitors to accelerate their own OLED desktop offerings and reshape the premium all‑in‑one market.
