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VA Liquid Crystal Display

- Jan 15, 2018 -

VA liquid crystal is the abbreviation of vertical arrangement of liquid crystal. Compared with TN liquid crystal, VA liquid crystal has a higher contrast and wider visual angle, which is the mainstream technology used in today's large screen LCD TV.

目前夏普、东芝、三星、索尼以及台湾的群创、友达等都使用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)。

At present, SHARP, Toshiba, Samsung, SONY and Taiwan's Innolux, and so the use of VA LCD screen LCD TV manufacturing technology. SONY's palm type game machine PSP and SHARP's smart phone AQUOS PHONE use an enhanced VA LCD (ASV LCD) produced by SHARP.

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。

The development of VA liquid crystal will be traced back to 1970s. At that time, it was known as DAP Deformation of vertical Aligned Phase or Vertical Aligned Nematic. Because no invention of multi domain (Multi-Domain) technology and narrow vision and practicality, 90s research was suspended. After Fujitsu has solved this problem, the VA LCD has gained the attention of the industry again.


原理

principle

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,实现颜色和亮度的调节。

The liquid crystal molecules in the VA liquid crystal in the initial state are perpendicular to the polarizer plane, when the light is not permeable and the screen is black. When the voltage is applied to the conductive plate, the liquid crystal is arranged in the form of lodging, which leads to the light birefringence through the liquid crystal. In the initial state, the liquid crystal molecules are vertically arranged, and the backlight is almost impossible to pass through, so a large contrast can be achieved. The voltage size can control the lodging degree of liquid crystal molecules and realize the adjustment of color and brightness.

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。

At first the liquid crystal molecules can only be lodged in one direction, so the angle of view is directional. With the emergence of multi domain (Multi-Domain) technology, the 6 domains of liquid crystal molecules are divided into the upper and lower parts and left and right, and the direction problem is solved thoroughly.

优点

Advantage


对比度较高。

The contrast is high.

色温较温和。

The color temperature is mild.

漏光程度较低。

Low level light leakage.

可视角提升到178度,有改善TN版面失色的问题。

From the perspective of can be raised to 178 degrees, there are problems to improve TN blank layout.


缺点

shortcoming


虽然有跟IPS一样的178度可视角,但左右看屏幕会有偏白的情况。

Although there are 178 degrees of view like IPS, there will be a whiteness on the screen.

色彩较IPS

Color IPS