Patent ID: 9575405
Date: 2017-02-21
CPC Classifications: G03F

Claim:
1. A photo mask comprising: a transparent substrate; and a mask pattern on the transparent substrate, the mask pattern comprising a blocking portion for blocking light and a transmitting portion for transmitting the light, the transmitting portion being adjacent to the blocking portion, and the blocking portion comprising: a first blocking layer on the transparent substrate, the first blocking layer for transmitting a portion of the light, and the first blocking layer comprising a plurality of blocking patterns comprising a first blocking material; a photoguide layer on the first blocking layer, the photoguide layer for guiding the transmitted portion of the light to a side surface of the photoguide layer, and the photoguide layer comprising a photoguide material of which a refractive index is greater than a refractive index of the first blocking layer; and a second blocking layer on the photoguide layer, the second blocking layer for reflecting the transmitted portion of the light, and the second blocking layer comprising a second blocking material of which a refractive index is less than the refractive index of the photoguide material.