液晶材料及液晶顯示器簡介(存儲版)
【正文】 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 for TN LCDs First minimum condition : 3λΔn2du ??mμ 5nm 500 02( 0. 095 )( 550 nm )3nΔ 2 λ3d ????5 ?m is a typical cell gap for first minimum TN LCDs TN LCDs threshold voltage Using the previous equations, one can derive the redistribution of the director in a TN cell requires a threshold voltage give by 1 / 2112233o11th 4K2KK1ΔεεKπV?????????????? ??? For most nematic mixtures formulated for TN displays, Vth is typically around 1 V. T 0 60 80 100 40 20 0 1 Vth V 90 TN LCD (NW) TV curve TN LCDs Contrast Ratio →Commonly used Performance of TNLCD standard products Viewing angle needs to improve: will discussed later (2) STN: twisting angle 180o270o STN amp。 w 光學(xué)上是屬於
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號-1