Method forming a micro LED display device

A method forming a micro LED display device, comprising:

• providing a substrate;
• bonding a plurality of micro light-emitting diodes on the substrate by a mass transfer process;
• forming a first reflective layer on the substrate, wherein the first reflective layer covers the substrate and a sidewall of each micro light-emitting diode;
• forming a first black layer to cover the first reflective layer and the plurality of micro light-emitting diodes;
• etching back the first black layer until a top surface of each micro light-emitting diode is exposed through the first black layer;
• forming a second reflective layer and a second black layer on the plurality of micro light-emitting diodes and the first black layer;
• patterning the second reflective layer and the second black layer into a plurality of reflective banks and a plurality of black banks, respectively;
• and
• filling a color-conversion material laterally between the plurality of reflective banks, wherein the color-conversion material covers the top surface of at least one of the plurality of micro light-emitting diodes.