Liquid crystal display device

A liquid crystal display device comprising:

• a pair of substrates, at least one of which is transparent;
• a liquid crystal layer held between said pair of substrates;
• and
• an alignment layer formed on at least one of said pair of substrates;
• wherein
• said pair of substrates are adhered together using a resin so that an interval is formed therebetween, and a portion formed with said resin has at least an opening for injecting liquid crystal into said interval formed between said pair of substrates;
• and wherein
• said opening is sealed with a photo-curable resin, and said liquid crystal layer comprises:
• (i) a photo-reactive liquid crystal compound, the molecular structure of which is converted by photo-irradiation, and
• (ii) a photo-absorbing organic compound having a photo-absorptivity larger than the photo-absorptivity of said photo-reactive liquid crystal compound at a designated wavelength, and containing at least one of alkyl substituent, alkenyl substituent, and alkoxyl substituent, respectively, in its molecule;
• wherein
• the weight concentration ratio of said photo-reactive liquid crystal compound to said photo-absorbing organic compound is equal to or less than 20, and
• a change rate of birefringence Δn of the liquid crystal layer before and after photo-irradiation including a specified wavelength is expressed as 0.98>Δn (after irradiation)/Δn (before irradiation)>0.9.

A liquid crystal display device comprising:

• a pair of substrates, at least one of which is transparent;
• a liquid crystal layer held between said pair of substrates;
• and
• plural electrodes and an alignment layer provided on at least one of said pair of substrates;
• wherein
• said pair of substrates are adhered together using a resin so that an interval is formed therebetween, and a portion formed with said resin has at least an opening for injecting liquid crystal into said interval formed between said pair of substrates;
• and wherein
• said opening is sealed with a photo-curable resin, and said liquid crystal layer comprises:
• (i) a photo-reactive liquid crystal compound, the molecular structure of which is converted by photo-irradiation, and
• (ii) an photo-absorbing organic compound having a photo-absorptivity larger than the photo-absorptivity of said photo-reactive liquid crystal compound at a designated wavelength, and containing at least one of alkyl substituent, alkenyl substituent, and alkoxyl substituent, respectively, in its molecule;
• wherein
• the weight concentration ratio of said photo-reactive liquid crystal compound to said photo-absorbing organic compound is equal to or less than 8, and
• a change rate of birefringence Δn of the liquid crystal layer before and after photo-irradiation including a specified wavelength is expressed as 0.98>Δn (after irradiation)/Δn (before irradiation>0.94.