Patent ID: 6638698
Filing Date: 2003-10-28
Classification: G02B,G02F

Abstract:
A method for fabricating diffusive-type light reflector, said diffusive-type light reflector being used for scattering incident light into a predetermined angular area away from specular ray, said method comprising:forming a photoresist layer on a substrate; exposing said photoresist layer under defocus exposure through a slit-width-adjusting mask, said slit-width-adjusting mask comprising a plurality sets of slit, each set of slit comprising several portions having width p2, each portion comprising a slit, a first portion under light source of said defocus exposure having a first exposure p1, a second portion under light source of said defocus exposure having a second exposure q1, transparent area within said second portion having width of q2, said first exposure p1 being greater than said second exposure q1, and (q2)/(p2)=(q1)/(p1); baking said photoresist layer; developing said photoresist layer to form a photoresist pattern, said photoresist pattern comprising a plurality of bumps, each of said plurality of bumps comprising a first surface and a second surface, said first surface having a longer slant than said second surface, a first angle &phgr; between said first surface and said substrate being unequal to a second angle &thgr; between said second surface and said substrate; and forming a reflective layer on said photoresist pattern, a normal direction of said first surface being pointing to a predetermined direction enabling reflective light of said incident light reflected by said reflective layer scattered into said predetermined angular area.