【正文】 O Glasses ITO Glasses Ex Ey k Birefringence of LC z (optical axis) y x=x’ no O ne ? ? ? no Inclined plane z’ y’ ? neff (?)?none/(no2sin2? + ne2cos2 ?)1/2 ?? =2??nd/?=π/2 （綱要） Outlines 簡介 ˙ 市場 ˙ 液晶簡介 液晶光學性質(zhì) 液晶顯示器模式 LC mode? Source: Sharp LCD Modes SURVEY OF LIQUID CRYSTAL DISPLAY MODES 1. Birefringence mode 2. Dichroic Dye mode 3. Scattering mode ? TN , STN (Polarization Rotation ) ? ECBelectrically controlled birefringence (or phase retardation) – VA, IPS, HC, ChiralVA ? FLCFerroelectric LC ? Mixed mode Birefringence Mode Color Filter Alignment Layer Backlight Conducting Layer (ITO) Twisted Nematic Liquid Crystal Displays A Twisting Nematic (扭曲型 LCD ) Normally Black : P//A V=0 , Dark State Normally White : P⊥ A V=0 , transparent State TNLCD作法 1. ITO cotaed glass 2. Alignment layer (spin coating) 3. Baking 4. Rubbibg?Pretilt~20?避免 reverse tilt 5. Cell ? thickness? It depends on the birefringence ?n of LC For 900 TNLCD between two parallel ideal polarizers (normally Black mode), the transmission is (unpolarized monochromatic) Rubbing Transmission of TN LCDs NB mode 222222u1u12πs i n21XXs i n21T??????? ??? ?Where: X2 = ?2 + ?2/4 ? = 2??nd/? ? = ?/2 λΔn2d2Γu ???????? 63 , 35 , 15 , 3u, 0T if(Minimum conditions) (Gooch and Tarry) Transmission of TN LCDs NW mode 222u1u12πs i n2121T??????? ???λΔn2d2Γu ???Where: ? = 2??nd/? ? = ?/2 ????? 63 , 35 , 15 , 3u, 21T if (Maximum conditions) (Gooch and Tarry) ??=?m, ?m or ?m 選 LC? ?n已知 ?d可知 LC+少許 chiral ponent 避免 reverse twist Typical cell gap