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Stretchable photoresponse liquid crystal light scattering display screen and manufacturing method thereof

A light scattering and display technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of low contrast and non-stretchability, and achieve the effects of good fatigue resistance, high brightness, and wide field of view

Active Publication Date: 2015-12-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a stretchable liquid crystal light-scattering display screen with a large stretch ratio, a high contrast and a photoresponse by adding a small amount of gel factor without using a polarizer, and overcomes the problem of gel in the liquid crystal gel. Due to the shortcomings of high factor content, the need for polarizers in traditional liquid crystal displays, low contrast and non-stretchability, the preparation process is simple, and it can be applied to the field of stretchable liquid crystal light-scattering displays with high image contrast

Method used

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  • Stretchable photoresponse liquid crystal light scattering display screen and manufacturing method thereof
  • Stretchable photoresponse liquid crystal light scattering display screen and manufacturing method thereof
  • Stretchable photoresponse liquid crystal light scattering display screen and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0027] Example 1: Light-responsive stretchable liquid crystal light-scattering display

[0028] (1) Preparation of polyurethane film

[0029] Clear polyurethane 95A (purchased from Shanghai Zhixin Technology Co., Ltd.) 1.0g and polyurethane Clear 95B (purchased from Shanghai Zhixin Technology Co., Ltd.) 1.5g was mixed thoroughly at room temperature (25°C), and placed in a vacuum desiccator at room temperature for 12 minutes for defoaming to obtain a non-foaming prepolymer with certain fluidity. Quickly introduce it into a mold (76mm×25mm×3mm) made of glass slides, wherein the thickness of the mold is controlled by double-sided adhesive tape to 3mm, and the thickness of the film is 1mm. After the transfer was completed, the prepolymer was cured at 150°C for 10 minutes at high temperature, and then peeled off with a blade while it was still hot to obtain a polyurethane film matrix, which was cut into a polyurethane film with a size of 65mm×23mm×1mm.

[0030] (2) Light-respo...

Embodiment 2

[0033] Embodiment 2: Measurement of light transmittance of liquid crystal physical gel

[0034] At 150°C, add 4.7wt% 4,4'-diethoxyazobenzene and 0.5wt% gel factor (compound of formula (IX)) to 94.8wt% 5CB liquid crystal, 150°C oil bath Mix well and wait until they are mutually soluble to prepare liquid crystal physical gel 0.5wt% POSS-G1-BOC / 5wt% 2Azo2 / 5CB. The liquid crystal physical gel was poured into a mold box (30mm×20mm×2.5mm) made of glass slides, and the thickness of the liquid crystal physical gel layer was controlled to be 0.5mm. After irradiating the liquid crystal physical gel layer with ultraviolet light with a wavelength of 365nm for 5.5 minutes, the light transmittance of the liquid crystal physical gel showed an "S" type change with time, as shown in Fig. figure 2 shown. At 0-1.0min, the liquid crystal molecules still maintain the anisotropic phase, and the light transmittance hardly changes at this time. At 1.0-3.0min, the azobenzene compound molecules con...

Embodiment 3

[0036] Example 3: Changes in the display screen image before and after the liquid crystal physical gel is irradiated with ultraviolet / blue light

[0037] At 150°C, add 4.7wt% 4,4'-diethoxyazobenzene and 0.5wt% gel factor (compound of formula (IX)) to 94.8wt% 5CB liquid crystal, 150°C oil bath Mix well and wait until they are mutually soluble to prepare a liquid crystal physical gel 0.5wt% POSS-G1-BOC / 5wt% 2Azo2 / 5CB, and pour it into a mold box (40mm×25mm×2.2mm) made of glass slides , controlling the thickness of the liquid crystal physical gel layer to be 0.2 mm. Liquid crystal physical gel before and after UV / blue light irradiation (UV light: 35.4mW / cm 2 , 10min; blue light: 26.5mW / cm 2 , 3min) The display image changes as follows image 3 shown. Such as image 3 As shown in (a), the liquid crystal physical gel as a whole scatters the incident light, showing an opaque state, and the school logo of "Zhejiang University of Technology" cannot be seen. However, when the liq...

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Abstract

The invention discloses a stretchable photoresponse liquid crystal light scattering display screen and a manufacturing method thereof. The stretchable photoresponse liquid crystal light scattering display screen is manufactured by coating azobenzene-containing liquid crystal physical gel on the surface of a stretchable membrane and then covering another stretchable membrane on the surface of the azobenzene-containing liquid crystal physical gel. The azobenzene-containing liquid crystal physical gel comprises the following components by weight percent: 89.7-98.9% of liquid crystal matrix compound, 1-8.7% of azobenzene compound and 0.1-1.6% of gelator, and the stretchable membrane is a polyurethane membrane or a PDMS membrane. The stretchable photoresponse liquid crystal light scattering display screen disclosed by the invention is simple in manufacturing process, has photoresponse, long stability time under visible light, good tensile property, and good anti-fatigue performance, can be repeatedly used, and has the characteristics of wide view, high luminance and high image contrast.

Description

(1) Technical field [0001] The invention relates to a liquid crystal light-scattering display screen and a preparation method thereof, in particular to a light-responsive stretchable liquid crystal light-scattering display screen and a preparation method thereof. (2) Background technology [0002] Liquid crystal physical gel is a new type of multifunctional soft material obtained by using liquid crystal compounds as matrix molecules and utilizing the self-assembly properties of gel factors. It not only retains the unique light, electricity, magnetism, heat, etc. Response characteristics, and endow the liquid crystal compound with a certain shape. Therefore, liquid crystal physical gels are widely used in light scattering displays, gratings, semiconductor materials and other fields. [0003] Generally, the content of gelatin factor applied to stretchable liquid crystal light scattering display devices is relatively high. If the gel strength required by a stretchable liquid ...

Claims

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Application Information

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IPC IPC(8): G02F1/1334C09K19/52
CPCC09K19/52C09K2019/526G02F1/1334G02F1/13345
Inventor 陈思王旭童晓茜吴波震马猛施燕琴
Owner ZHEJIANG UNIV OF TECH
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