DD227721A1 - COMPONENTS OF LOW DOUBLE CRASHING FOR CRYSTALLINE-FLUID MIXTURES FOR OPTOELECTRONIC COMPONENTS - Google Patents

Abstract

The invention relates to the use of liquid-crystalline nematic substances in optoelectronic components (displays). The object of the invention are mixtures with low optical birefringence, which are suitable for use in optoelectronic displays. It has been found that novel crystalline liquid 2,5-disubstituted trans-1,3-dioxadecalins of the general formula are well suited as low birefringence components for mixtures used in optoelectronic devices.

Description

Field of application of the invention;

The invention relates to the use of liquid-crystalline nematic substances in optoelectronic components for the modulation of continuous or incident light and for the representation of numerals, characters and images.

Characteristic of the known technical solutions

3-liquid crystalline nematic substances are used as dielectrics in optoelectronic displays of different types / H · Kelker, H. · Satz: Handbook of Liquid Crystals, Verlag Chemie 1980 /,

In recent years, many new applications have been proposed, "requiring displays with very specific properties, no pure substances are known which even approximately meet the requirements of the art." Therefore, mixtures of crystalline-liquid substances are always used have the door part that you can modify the properties within a wide limits by appropriate choice of the mixture components and thus adapt to specific applications ·

In particular, mixtures with low optical * birefringence ( Δη ) are advantageous for mixtures which are to be used for the guest-host effect. Blends for Schadt-Helfrich cells give the displays favorable properties with regard to the readability of the information under shallow Angle when the mixtures have a low optical birefringence

f * Λ / "*. I.

Since the birefringence of a mixture is approximately additive from the values of the pure components, substances with low values of birefringence are a necessary requirement for obtaining mixtures of low birefringence.

Object of the invention

The aim of the invention are mixtures with low optical birefringence, which are suitable for use in optoelectronic displays.

Explanation of the essence of the invention

The object of the invention are components which impart low optical birefringence to liquid-crystalline nematic mixtures.

It was found that new crystalline liquid 2,5-disubstituted trans-1,3-Diozadecaline the general formula

where X or X

where R ¹

; - <O \ -C00R ³

(D

° ^H 2n + 1

= from 1 to 10 with η, as components of low birefringence for mixtures that are used in optoelectronic devices _etc. are well suited ·

Ausführungsbeiffpiele example 1

The following tables give examples of the substances according to the invention with their transformation temperatures. Where:

K β crystallin-solid 2T β nematic S ^ β smectic A phase I = isotropic-liquid

Table 1

Verb EKU

4/1 CH ₃ . 137 (V 69)

4/2 C ₂ H ₅ . 122 C 80)

4/3 C ₃ H ₇ α 111 (· 90)

4/4 C ₄ H ₉ . 103 (. 91.5)>

4/5 C ₅ H ₁₁ . 95 C. 84)

4/6 C ₆ H ₁₃ . 112.5 (.66)

4/7 OC H ₃ . 151.5 (^ 118.5)

4/8 OC ₂ H ₅ . 1:12 .135

4/9 OC ₃ H ₇ . 113 (^ 112.5) · '

4/10 OC ₄ H ₉ . 94 .115 *

4/11 OC ₅ H ₁₁ . 96 · 99

4/12 O ° 6 ^H i3 * ⁹⁸ * 99.5

4/13 OC ₇ H ₁₅ «. 96 (.92)

Verb. R

β / 1 6/2 6/3 6/4 6/5

4.14 >"\Γ" TT \ J'wJ ο- "·) rf OI ι , βδ *. 97 2 • 4.15 / "V"? TX ο 77 • 89 • 4/16 r \ tr rt H ₂₁ 0C _t0 I. · ^: 82 ; 89 4.17 CH 193 - - ^ w- / ΪΓ I table 2 O-o, ^ * "" ·. Verb" R K »93.3. 1.5 GST , 105 ) -000- <g) .E 5.2 , 82.5 I Terb * R

- ° 6 ^H 13 ^C 6 ^H 13 "

i 87.5. 7T _r 5 • 97

70)

56 _r 8)

214

- 93 · 94.5

98

table ^

Verb"

7/1 7/2 7/3 7/4 7/5 7/6 7/7 7/8

7/10 7/11

7/12 · 7/13 -

table

-OC

₃ H ₇

-OOC-CH

-0OC-C ₂ H ₅

CF

-C

^Q 13 • ^C 6 ^H 13

Terbi R

, 77.5 - - (.63.5).

- 77 - - (.74,0) ο

, 61 - - · 70

, 61 (.31) - -.

»90 - - (.55,5).

£ 86 - - U78)

·· 79 - - .79,2.

V 87 - - (.85)

, 79 -

.234 (Z)

ο 53.5 U36). *. 87 - - (.80)

, 87.5 - i- '' * 237 (Z) ^ 152 - - .258 (Z)

3fs

C ₆ H ₁₃ C ₆ H ₁₃ 58

83 i 94-

* 54 i 87.9 V 88.1 ·

Example 2

On some substances according to the invention-the optical birefringence 4 η for light of wavelength 589 nm each

10 S under the Slärpimkt as well as the melt enthalpy ^ H measured »

Substance Ur * η H / kJ »mol"

³ ^ (_ j> - <Q> - € ₆ H ₁₃ 8/2 0.045 33.1

7/3 0.056 34.9

° ^f ° ³³⁵

The measured birefringences are extremely low, liquid crystals usually have values Λ η> * 0.1 / Η · Kelker, R · Hatz, Handbook of Liquid Crystals, Verlag Chemie 1980 / ο

Example 3 ~ ^;

The influence of the substances according to the invention on the electro-optical properties of mixtures is evident from the following summary

 Sine mixture Iu 14 »consisting of

4-n-Prop3 ^r l-cyclohexanecarboxylic acid 4-c7anphenyl ester 34 _r 5 mol% 4-n-butyl-ti η ₃₁ mdl-%

4-n-Eenty- "" 34.5 mol%

changes its properties in the following way: Composition Mi 1-4 Substi ^ _nT ^ ₇ Tr _1n U _n ^ V = ZUL 2L ⁵⁰ ^ Q _y d

100 - ^. '... 72 , 0 - V3 2 ; 6 580 2oD 33 , 0 24 , 0 90 8.1 10 73 , 0 1 , 4 2 ,8th 750 350 46 , 5 21 , 7 90 2.8 10 73 , 5 1 , 4 2 ,8th 680 150 46 , 7 20 , 0

Cl.p.. - clearing point in ⁰ C

U - threshold voltage at 20 ⁰ G, 500 Hz ü - operating voltage

^ J ^ - Binary switching time at 5Q % intensity change, ³⁴ .20 OG, 500 Hz

L _A ⁵⁰ - Cooldown at 50 % intensity change, ^A 20 ⁰ C, 500 Hz

d - layer thickness - viscosity at 20 ⁰ G in cP

Example 4

To a mixture of diozane derivatives of the following composition

50 mol% KLp · 43 ⁰ G

50 mol%

in each case 20 mol% of substance were admixed. This resulted in the following changes in the clarification: mixed

Substance clearing point

/> ww λ C ⁵ G)

8/2 50

8/1 58

Claims (1)

invention claim Components of low birefringence for crystalline liquid mixtures for optoelectronic devices, characterized in that _f new liquid crystalline 2,5-di-substituted trans-1,3-Dioxadecaline OCE generally lormel (I) wherein Σ »H and Y = R ¹ or X = R ² and X = R ¹ , wherein R ¹ " - / q \ -OOCR ³ ; Q> -COOR ³ SQ) -C _n H _{2n + 1} ^C n ^H 2n ₊ t R- with η = 1 to 10, can be used ^C n ^H 2n + 1