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Liquid crystal composition

A liquid crystal composition and composition technology, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of display screen lag, slow response speed, etc., and achieve short response time, high voltage retention rate, and wide nematic phase temperature range effect

Active Publication Date: 2011-10-26
陕西蒲城海泰新材料产业有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to its own display characteristics, the response speed of liquid crystal is slow, which causes the display screen to lag in daily display, and research shows that a small cell gap can help improve the response speed of liquid crystal, thereby improving the display effect of the screen; therefore In recent years, in order to shorten the response time of the display element, the cell gap of the display element used is getting smaller and smaller, but in order to ensure the display effect such as the contrast of the display element, Δn*d (Δn represents optical anisotropy, d represents the cell gap of the element ) and other parameters are not changed, which requires the liquid crystal composition to have higher optical anisotropy, and the optical anisotropy of the liquid crystal composition in the existing display elements is mostly between 0.08 and 0.12

Method used

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preparation example Construction

[0061] The preparation of the composition of the present invention is to select its weight percentage according to the ratio range of these several compounds, and carry out according to a conventional method. The usual conventional preparation method is to mix and heat its components to dissolve each other until the completion of the dissolution process is observed. But it is also possible to dissolve and mix the components in a suitable organic solvent (a suitable organic solvent such as acetone, chloroform or methanol), and remove the solvent after thorough mixing to finally obtain a uniform liquid crystal composition. This method must ensure that no pollutants or unnecessary dopants are introduced into the solvent.

[0062] The liquid-crystalline media according to the invention can also further comprise additives known to the skilled person and described in the literature, making it possible to use them in any type of liquid-crystal display disclosed so far.

Embodiment 1

[0077]

[0078]

[0079] The physical parameters of the composition are as follows:

[0080] T NI =76℃ ΔN=0.126 Δε=+4.76 V 90 =2.03V

Embodiment 2

[0082]

[0083]

[0084] The physical parameters of the composition are as follows:

[0085] T NI =78℃ ΔN=0.124 Δε=+4.43 V 90 =1.97V

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Abstract

The invention discloses a liquid crystal composition, which has the characteristics of high optical anisotropy, wide nematic phase temperature range, high specific resistance, high stability, low viscosity, and so on. The liquid crystal composition also has rapid response speed, and can well adapt to display elements driven by an active matrix thin-film transistor (AM-TFT). The liquid crystal composition comprises four compounds of general formulas I, II, III and IV, and also comprises compounds of general formulas V-VII. The one or more compounds in the formulas I, II, III and IV as well as formulas V-VII are 10-70wt%, 1-40wt%, 1-40wt%, 1-40wt%, and 0-40wt% respectively. The optical anisotropy value deltan of the liquid crystal composition disclosed by the invention is within 0.12-0.15.

Description

technical field [0001] The present invention is a liquid crystal composition suitable for AM (active matrix, active matrix) devices, etc., especially a composition with a nematic phase and a composition with positive dielectric anisotropy. Background technique [0002] For display elements, according to the operation mode of liquid crystal, it is divided into TN (twisted nemtic twisted nematic), STN (super twisted nemtic super twisted nematic), ECB (electrically controlled birefringence), OCB (optical compensated bend optical compensation bending), IPS (in-plan switching), VA (vertical aligbnent vertical alignment) and other types. According to the driving method of the component, it is divided into PM (passive matrix passive matrix), AM (active matrix active matrix) and other types. Liquid crystal display elements are classified into reflective type using natural light, transmissive type using backlight, and transflective type using both natural light and backlight accordi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/44
Inventor 陆涛王维田长乐金立诺刘骞峰陈谦髙仁孝刘晓春
Owner 陕西蒲城海泰新材料产业有限责任公司
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