Liquid crystal composition and liquid crystal lens

Abstract

A liquid crystal composition include a first compound (a) and a second compound (b), wherein the molecular structure formula of the first compound is represented as follows and the molecular structure formula of the second compound is represented as follows. The liquid crystal composition also includes a third compound (c) of which the molecular structure formula is represented as follows. The liquid crystal composition has high birefringence. The invention also relates to a liquid crystal lens including the liquid crystal composition.

Description

technical field [0001] The invention relates to the field of liquid crystal technology, and in particular to a liquid crystal composition and a liquid crystal lens using the liquid crystal composition. Background technique [0002] Nowadays, the mainstream of 3D display is the viewing method that needs to wear glasses, which will cause some inconvenience to the audience, especially for the audience who already wear glasses. The naked-eye 3D display does not need to wear glasses, which provides a convenient viewing method. It will be the development direction of 3D display. The principle of naked-eye 3D display is to split the screen image through a spectroscopic device on the display screen, so that the left eye and right eye receive different image information on the screen, allowing us to "feel" the 3D effect. Common spectroscopic devices for naked-eye 3D include slits and gratings. [0003] The lens gratings used in 3D devices can be roughly divided into two types. One ...

AI Technical Summary

Problems solved by technology

However, the high birefringence nematic liquid crystal materials currently used in the field of 3D display need to be improved, mainly in the low birefringence Δn and the rotational viscosity γ 1 Too big etc.

The main method to increase the birefringence is to increase the conjugated structure of the molecule, and the traditionally used ternary conjugated structure molecules, such as terphenyl, tolan molecules have limited effect on increasing the birefringence, and the mixed crystal The formulation should be kept free of crystallization at room temperature (20°C), and the birefringence Δn higher than 0.4 cannot be achieved under the premise that the rotational viscosity is lower than 300mPa*s

Therefore, molecules with a traditional ternary conjugated structure can no longer meet the requirements of higher birefringence, and liquid crystal molecules with a larger conjugation length must be used, such as using a quaternary conjugated structure, a pentad conjugated structure or a higher conjugated structure. , it is expected to break through Δn=0.4

However, if a common quaternary conjugated structure is used, such as quaterphenyl, it will inevitably lead to excessive liquid crystal viscosity, crystallization at room temperature, and a sharp decrease in response speed.

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