Liquid-crystalline medium and liquid-crystal display comprising the same
A liquid crystal medium and display technology, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of low contrast, insufficient life, high operating voltage, etc., and achieve high positive dielectric anisotropy, good low temperature stability. , the effect of favorable capacitance threshold
Active Publication Date: 2016-10-26
MERCK PATENT GMBH
View PDF23 Cites 11 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, these displays using dielectrically negative liquid crystals have a serious disadvantage: they require higher operating voltages than individual displays using dielectrically positive liquid crystals
[0030] In addition to their relatively poor transmittance and their relatively long response times, the hitherto disclosed MLC displays have other disadvantages
These are for example their relatively low contrast ratio, their relatively high viewing angle dependence and difficulty in grayscale reproduction in these displays, especially when viewed from oblique viewing angles, as well as their insufficient VHR and their insufficient lifetime
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 11 and 12
[0527] Compounds of formula I-1 are, for example,
[0528]
[0529] The compound (CK-3-F) has a melting point of 85°C, a Δε of -8.4 and an ε of 13.4 av. .
[0530]
[0531] The compound (CK-5-F) has a phase sequence of K74°C N (63.7°C) I, Δε of -7.8 and ε of 12.2 av. .
Embodiment 2
[0533] Compounds of formula I-2 are, for example,
[0534]
[0535] This compound (YG-2O-F) has a melting point of 69°C, a Δε of only +1.0, and an ε of already 13.4 av. .
Embodiment 3 and 4
[0537] Compounds of formula I-3 are, for example,
[0538]
[0539] This compound (B-2O-O5) has a melting point of 57°C, a Δε of -13.7 and an even ε of 17.9 av ..
[0540]
[0541] This compound (B-4O-O5) has similar preferred properties.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| isotropization temperature | aaaaa | aaaaa |
| surface area | aaaaa | aaaaa |
| melting point | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a liquid-crystalline medium, preferably having a nematic phase and dielectric anisotropy of 0.5 or more, which has particular dielectric properties, in that it has either a dielectric constant perpendicular to the director (shown in the description) in the range of 2 or more to less 8 or less and at the same time a ratio of the dielectric constant perpendicular to the director (shown in the description) to the dielectric anisotropy (shown in the description), i.e. (shown in the description) of 1.0 or more or or a dielectric constant perpendicular to the director (shown in the description) of 8 or more and a dielectric anisotropy (shown in the description) of 26 or less and preferably comprises one or more compounds having a high dielectric constant perpendicular to the director (shown in the description) and a high average dielectric constant (shown in the description), to the use thereof in an electro-optical display, particularly in an active-matrix display based on the IPS or FFS effect, to displays of this type which contain a liquid-crystalline medium of this type, and to the use of the compounds of formula I for improvement of the transmission and / or response times of a liquid-crystalline medium which comprises one or more additional mesogenic compounds.
Description
technical field [0001] The present invention relates to novel liquid crystal media, in particular liquid crystal media for liquid crystal displays, and these liquid crystal displays, in particular liquid crystals using dielectrically positive liquid crystals utilizing the IPS (In-Plane Switching) or preferably FFS (Fringe Field Switching) effect monitor. Occasionally the latter is also referred to as SG-FFS (super-controlled FFS ( s uper g rip FFS)) effect. For this effect, dielectrically positive liquid crystals are used, which contain one or more compounds with both high dielectric constants parallel to the molecular director and perpendicular to the molecular director, resulting in large average dielectric constants and high dielectric constants. electrical ratio, and preferably at the same time a relatively small dielectric anisotropy. The liquid-crystalline medium optionally additionally comprises dielectrically negative, dielectrically neutral compounds or both. Liq...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/44C09K19/46G02F1/1333
CPCC09K19/44C09K19/46G02F1/1333C09K19/02C09K19/062C09K19/3098C09K19/32C09K2019/0466C09K2019/122C09K2019/301C09K2019/3027C09K2019/3408C09K2019/3422C09K19/0225C09K19/025C09K19/3402G02F1/134363G02F1/1362G02F1/133633G02F1/134372C09K19/3405
Inventor 真边笃孝
Owner MERCK PATENT GMBH