超扭曲向列相液晶显示(STN-LCD)在实际应用中经常会出现一种由周期性条纹织构引起的晶畴,这种晶畴引起光散射使显示性能下降.采用4种不同的PI作为超扭曲向列相(STN)液晶盒的取向膜,在相同的条件下用摩擦法取向并制成盒后用偏光显微镜观察,发现不同PI取向的盒其均匀性有显著差异,有的盒中有晶畴出现,有的盒则显示出了良好的均匀性.晶体旋转法测量结果表明,不同PI引起不同的预倾角,取向均匀的盒所用PI产生的预倾角比其他PI产生的预倾角要大3 °左右.分析认为,较大的预倾角抑制了晶畴的产生,在合适的d/p值下,预倾角只要达到5 °以上时即可以有效地抑制条纹的产生,满足生产要求,为解决STN-LCD存在的晶畴问题提供了依据和方法.
参考文献
| [1] | Chigrinov V G,Belyaev V V,Belyaev S V,et al.lnstabilities of cholesteric liquid crystals in an electric field[J].Sov.Phys.JETP.,1979,50(3):994-999. |
| [2] | Weber G,Plach H J,Naemura S,et al.Influence of material parameters on the temperature dependence of the electrooptic characteristic of STN displays[C]//The 9th International Display Research Conference (Jap.Display'89).Japan,Tokyo:Palisades Institute for Research Services,Inc.,1989:532-535. |
| [3] | Nishi S.SBE liquid crystal displays with improved response time[C]//The 6th International Display Research Conference (Jap.Display'86).Japan,Tokyo:Palisades Institute for Research Services,Inc.,1986:392-395. |
| [4] | 张辉,郭克定.d/p 窗口的研究[J].液晶与显示,1995,3(1):12-16. |
| [5] | Scheffer T J,Nehring J,Kaufmann M,et al.24 ×80 character LCD panel using the supertwisted birefringence effect[C]//Jay Morreale 1985 SID.USA,California:Palisades Institute for Research Services Inc.,1985:120-123. |
| [6] | Jin Seog Gwag,Seo Hern Lee,Kyoung-Ho Park.Simple method for measuring the high pretilt angle of nematic liquid crystals[J].J.Appl.Phys.,2003,93(8):4936-4938. |
| [7] | Scheffer T J,Nehring J.Accurate determination of liquid-crystal tilt bias angles[J].J.Appl.Phys.,1977,48(5):1783-1792. |
| [8] | Derfel G,Krzyzański D.Influence of the surface tilt angle on the spatially periodic distortions in super-twisted nematic displays[J].J.Appl.Phys.,2004,95(7):3535-3540. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%