000136442 001__ 136442
000136442 005__ 20180913055213.0
000136442 0247_ $$2doi$$a10.1117/1.1447229
000136442 037__ $$aARTICLE
000136442 245__ $$aImproved red color with cholesteric liquid crystals in Bragg reflection mode
000136442 269__ $$a2002
000136442 260__ $$c2002
000136442 336__ $$aJournal Articles
000136442 520__ $$aThe helical pitch of the cholesteric liquid crystal (CLC) can be adjusted to reflect the colors red, green, and blue. Additive mixing of these colors in displays results in multicolor images and it is easy to use pure primary blue and green colors, but the red color is in general very unsaturated. We show by simulations that this poor red color performance is due to reflection sidebands on the smaller wavelength side of the normal red Bragg reflection band. We discuss five approaches to improve the red color performance, namely, two types of spectral filtering (dyes or filters), a very low birefringence CLC, a gradient in the birefringence of the CLC, and the use of a bluish reflector. The two methods of spectral filtering are also experimentally tested. © 2002 Society of Photo-Optical Instrumentation Engineers.
000136442 700__ $$aKipfer, P.
000136442 700__ $$aKlappert, R.
000136442 700__ $$0243453$$aHerzig, H. P.$$g155721
000136442 700__ $$aGrupp, J.
000136442 700__ $$0243803$$aDändliker, R.$$g104849
000136442 700__ $$0243803$$aDändilker, R.$$g104849
000136442 773__ $$j41$$q638-646$$tOpt. Eng.
000136442 8564_ $$s272092$$uhttps://infoscience.epfl.ch/record/136442/files/OE_02%20vol%2041%20Red%20color.pdf$$yn/a$$zn/a
000136442 909C0 $$0252204$$pOPT
000136442 909c0 $$xU11965
000136442 909CO $$ooai:infoscience.tind.io:136442$$pSTI$$particle
000136442 917Z8 $$x155721
000136442 937__ $$aOPT-ARTICLE-2002-006
000136442 973__ $$aOTHER$$rNON-REVIEWED$$sPUBLISHED
000136442 980__ $$aARTICLE