US 10,890,783 B2
Method of forming a film with a lenticular lens array
Beng Soon Tan, Singapore (SG); Chee Fatt Frank Chan, Singapore (SG); Yun Xu, Singapore (SG); Bee Khuan Jaslyn Law, Singapore (SG); Yee Chong Loke, Singapore (SG); and Hong Yee Low, Singapore (SG)
Assigned to Agency for Science, Technology and Research, Singapore (SG); and Temasek Polytechnic, Singapore (SG)
Filed by Agency for Science, Technology and Research, Singapore (SG); and Temasek Polytechnic, Singapore (SG)
Filed on Nov. 21, 2018, as Appl. No. 16/198,386.
Application 16/198,386 is a division of application No. 14/648,063, abandoned, previously published as PCT/SG2013/000507, filed on Nov. 29, 2013.
Claims priority of application No. 201208833-2 (SG), filed on Nov. 29, 2012.
Prior Publication US 2019/0094561 A1, Mar. 28, 2019
Int. Cl. G02B 3/00 (2006.01); G02B 27/22 (2018.01); G02B 30/27 (2020.01)
CPC G02B 30/27 (2020.01) [G02B 3/0031 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of forming a film with a lenticular lens array wherein each lens of the lenticular lens array has an optimum focal length, the method comprising:
providing a substrate;
providing a mold having a plurality of nano-scale to micro-scale cavities that form the lenticular lens array on the substrate, wherein each of the plurality of cavities forms a depression within the mold having dimensions between 50 nm and 250 nm and provide a hole on a surface of the mold;
having the surface of the mold contact the substrate; and forming the lenticular lens array, wherein the step of forming the lenticular lens array comprises:
increasing a temperature of the substrate to within 100 below and 100 above its glass transition temperature to cause the substrate to be in high viscosity;
applying a fixed pressure to compress the mold against the substrate for a controlled time duration while the substrate is in high viscosity to allow portions of the substrate to partially fill the plurality of cavities to form the plurality of lenses; and
reducing the temperature after the controlled time for demolding the mold from the substrate,
wherein the controlled time duration controls an extent to which the portions of the substrate partially fill the plurality of cavities to adjust an aspect ratio of each lens of the lenticular lens array so that each lens of the lenticular lens array has an optimum focal length.