Patent ID: 7724418

Claim:
A method of forming an electrophoretic display medium, comprising: a first resist application step wherein a first negative resist is applied on a first substrate; a first exposure step wherein the first negative resist is exposed to light through a first mask having an aperture pattern through which a pattern of a partition is exposed to light; a second resist application step wherein a second negative resist is applied on the first negative resist; a second exposure step wherein the second negative resist and the first negative resist are exposed to light through a second mask having an aperture pattern through which a pattern of a spacer is exposed to light; a development step wherein the first negative resist and the second negative resist are developed to form the partition and the spacer on the first substrate; disposing the first substrate and a second substrate to confront with each other with the partition and the spacer interposed between the first substrate and the second substrate, the partition partitioning a region between the first substrate and the second substrate, the spacer defining a distance therebetween; and injecting a dispersion medium between the first substrate and the second substrate with charged particles dispersed therein.