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VA液晶

VA液晶(Vertical Alignment liquid crystal)是垂直排列液晶的简称。跟TN液晶相比VA液晶有更高的对比度和更宽广的可視角度,是大部份LCD電視及曲面顯示器采用的技术。

目前夏普东芝三星索尼以及台湾的群創友達等都使用VA液晶技术制造大屏幕液晶电视。SONY的手掌式游戏机PSP和夏普的智能手机AQUOS PHONE使用了夏普生产的增强型VA液晶(ASV液晶)。

VA液晶的开发要追溯到20世纪70年代。那时候被称为DAP方式(Deformation of vertical Aligned Phase)或VAN(Vertical Aligned Nematic),由于没有发明多域(Multi-Domain)技术,视野狭窄实用性不高,90年代研究被中止。富士通解决了这个问题之后,VA液晶重新得到业界的瞩目。

原理

初期状态的VA液晶中液晶分子垂直于偏光镜平面排列,这时候光线无法透过,屏幕为黑色。对导电板施加电压后,液晶呈倒伏状排列,导致光线双折射透过液晶。初期状态液晶分子垂直排列,背光几乎无法透过,因此能实现大对比度。电压大小能控制液晶分子倒伏程度,实现颜色亮度的调节。

最初液晶分子只能向一个方向倒伏,所以视角有方向性。随着多域(Multi-Domain)技术出现,将液晶分子分为上下左右前后6个域倒伏彻底解决了方向性问题。

優點

  • 對比度高。
  • 漏光程度較IPS低。
  • 色溫較溫和,色彩表現較為豔麗。
  • 可視角可達178度,有改善TN版面失色的問題。

缺點

  • 雖然有廣視角的優點,但側看螢幕會有偏白的情況,較IPS稍差。
  • 色彩還原真實度亦稍遜於IPS。
  • 不如新一代IPS螢幕省電。

外部链接

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VA液晶
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