Patent ID: 7354520

Claim:
A method of manufacturing an optical element comprising at least a plurality of pixels formed on a substrate and partition walls arranged respectively between adjacent pixels, said method comprising the steps of: forming partition walls from a resin composition containing carbon black on a substrate; performing a dry etching process by irradiating the substrate carrying said partition walls formed thereon with plasma in an atmosphere containing a gas selected from the group consisting of oxygen, argon, and helium; performing a plasma treatment process by irradiating the substrate subjected to said dry etching process with plasma in an atmosphere formed by introducing a mixture of (a) a halogen gas selected from the group consisting of CF 4 , SF 6 , CHF 3 , C 2 F 6 , C 3 F 8 , and C 5 F 8 and (b) O 2 gas, wherein the amount of O 2 gas in the mixture is not greater than 30% such that each partition wall after said plasma treatment process shows a surface having a contact angle relative to pure water of not smaller than 110Â° and a surface coarseness represented by an arithmetic mean deviation (Ra) of between 3 nm and 50 nm which is greater than before said dry etching process and such that the substrate after said plasma treatment process shows a surface having a contact angle relative to pure water, of not greater than 20Â°; forming pixels by applying ink containing at least a setting ingredient, water, and an organic solvent to the areas surrounded by the partition walls by means of an ink-jet system; and setting the applied ink.