Electrophoretic display device and manufacturing method thereof

A method of manufacturing an electrophoretic display device comprising the steps of:

• preparing first and second substrates including electrodes;
• injecting a plurality of capsules between the first and second substrates;
• forming a dielectric layer formed of a dielectric material on one of the first and second substrates, before injecting the capsules between the first and second substrates, wherein after said injecting the dielectric layer is in contact with the capsules;
• and
• wherein coating the dielectric layer comprises:
• coating a dielectric material using a spin coater;
• performing a first heat treatment process on the substrate coated with the dielectric material;
• and
• performing a second heat treatment process on the substrate, on which the first heat treatment process has been performed in air.