OLED display and method of fabrication thereof

A method of forming an active matrix OLED display, the method comprising:

• providing a backplane comprising:
• a backplane substrate;
• a plurality of controllable gated electronic components each at a predetermined position on or directly beneath a surface of the backplane substrate, the controllable gated electronic components configured to control one or more pixels of the active matrix OLED display;
• and
• providing an OLED assembly comprising one or more pixel regions each having one or more pixel contacts, the OLED assembly formed separately from the backplane on an OLED substrate different from the backplane substrate, the OLED assembly further comprising an optical barrier between each pixel region and its adjacent pixel regions, the optical barrier comprising one or more grooves in a first surface of the OLED substrate, the optical barrier configured to at least partially block a light emitted at each pixel region from entering adjacent pixel regions through the OLED assembly;
• and
• joining the OLED assembly to the backplane, the joining comprising using conductive links to electrically connect one or more of the pixel contacts to the corresponding controllable gated electronic components.