Patent ID: 9391300
Filing Date: 2016-07-12
CPC Classification: C03C,H01L,Y02E,Y10T

Claim Text:
1. A method of producing a transparent diffusive organic light emitting diode substrate comprising: (a) lapping one face or both faces of a flat translucent glass substrate with an abrasive slurry, so as to obtain a flat glass substrate with at least one roughened surface having a roughness profile with an arithmetical mean deviation Ra of between 0.1 μm and 0.8 μm, said at least one roughened surface being roughened only by said lapping; (b) coating the at least one roughened surface with a high index glass frit having a refractive index of at least 1.7 to form a coated substrate, the amount of the high index glass frit being sufficient to completely cover the roughness profile of the at least one roughened surface after melting of said high index glass frit; (c) heating the coated substrate to a temperature above the melting temperature of the high index glass frit and below the softening temperature of the glass substrate, so as to form high index enamel on the at least one roughened surface, wherein the amount of the high index glass frit coated onto the at least one roughened surface at step (b) is comprised between 25 and 80 g/m wherein the high index glass frit and the resulting enamel are substantially devoid of solid scattering particles.