TY - GEN
T1 - A wide-viewing-angle liquid-crystal display using front-scattering film and directional backlight
AU - Saruta, T.
AU - Tagaya, A.
AU - Koike, Y.
PY - 2011/4/11
Y1 - 2011/4/11
N2 - A combination of front-scattering film and directional backlight has been proposed as a system for wide-viewing-angle transmissive liquid-crystal display (LCD). This system does not require precisely controlled phase difference film presently used in commercial LCDs, which is expected to make LCDs simpler and less expensive. However, this system has not, as far as we know, been put into practical use due to the blurring of images and the whitening of the scattering film that causes the degradation of contrast. In this article, we designed a scattering film that causes little blurring of images and whitening by optimizing conditions of light-scattering particles added to a polymer film and addition of the dye. The blurring of images was inhibited by doping polymer film with particles of high relative refractive index. The whitening of the scattering film was inhibited by the addition of the dye. The film in which particles were dispersed and accumulated showed different luminance properties and blurring of images at the same particle concentration. Finally, a directional backlight covered with the optimized scattering film showed equivalent luminance properties to those of a commercial backlight and demonstrated the feasibility of this system.
AB - A combination of front-scattering film and directional backlight has been proposed as a system for wide-viewing-angle transmissive liquid-crystal display (LCD). This system does not require precisely controlled phase difference film presently used in commercial LCDs, which is expected to make LCDs simpler and less expensive. However, this system has not, as far as we know, been put into practical use due to the blurring of images and the whitening of the scattering film that causes the degradation of contrast. In this article, we designed a scattering film that causes little blurring of images and whitening by optimizing conditions of light-scattering particles added to a polymer film and addition of the dye. The blurring of images was inhibited by doping polymer film with particles of high relative refractive index. The whitening of the scattering film was inhibited by the addition of the dye. The film in which particles were dispersed and accumulated showed different luminance properties and blurring of images at the same particle concentration. Finally, a directional backlight covered with the optimized scattering film showed equivalent luminance properties to those of a commercial backlight and demonstrated the feasibility of this system.
KW - directional backlight
KW - light scattering
KW - liquid-crystal display
KW - viewing angle
UR - http://www.scopus.com/inward/record.url?scp=79953724878&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79953724878&partnerID=8YFLogxK
U2 - 10.1117/12.874415
DO - 10.1117/12.874415
M3 - Conference contribution
AN - SCOPUS:79953724878
SN - 9780819484925
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Emerging Liquid Crystal Technologies VI
T2 - Emerging Liquid Crystal Technologies VI
Y2 - 25 January 2011 through 26 January 2011
ER -