Patent ID: 8797643
Filing Date: 2014-08-05
Classification: G02B,G02F

Abstract:
1. A light irradiation apparatus comprising: a light source generating ultraviolet light; a polarizer polarizing the ultraviolet light generated in the light source; and a filter, separate from the polarizer, blocking off the polarized light from the polarizer except an effective wavelength band of light for a photo alignment, wherein the filter includes a high pass filter blocking off a short wavelength band of light and a low pass filter blocking off a long wavelength band of light, wherein the short wavelength band is in a wavelength range below 250 nm, wherein the long wavelength band is in a wavelength range above 300 nm, wherein the polarizer includes a plurality of quartz plates, wherein the polarizer has an extinction ratio range of 34:1˜20:1, wherein a collimator is configured between the filter and a substrate to guide the light from the filter toward a substrate, wherein the light source includes a lamp having a high peak value within the effective wavelength band of about 200 nm˜330 nm.