Patent ID: 9423540
Filing Date: 2016-08-23
CPC Classification: G02B,G02F,H01L

Claim Text:
1. A method for manufacturing a grating sheet, comprising: depositing a silicon nitride film on a base substrate, forming a red (R) sub-wire grating, a green (G) sub-wire grating and a blue (B) sub-wire grating by a patterning process; coating a metal film on the base substrate to form a red (R) sub-grating, a green (G) sub-grating and a blue (B) sub-grating parallel with one another, wherein in each sub-grating, the metal film comprises a lower metal layer formed in an opening area for diffraction therein and an upper metal layer formed in a reflective region around the opening area, the lower and upper metal layers being made of same material; and forming a reflective film on the upper metal layer by a patterning process.