US4886344A
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Electro-optical display element
Assignee: Merck Patent GmbH
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Filing: 1988-08-19
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Granted: 1989-12-12
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Expires: 2008-08-19
Abstract
Abstract A suitable choice of the liquid crystal parameters K 3 /K 1 and ΔE/E 1 makes it possible in electrooptical display elements to obtain both a minimum dependence on the angle of observation and, simultaneously, a steep electro-optical characteristic when operated in the first transmission minimum.
Inventors
- 👤 Bernhard Scheuble
- 👤 Gunter Baur
- 👤 Waltraud Fehrenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:10
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/137; G02F1/139; G02F1/1396; C; C09; C09K; C09K19/00; C09K19/02; C09K19/0208; C09K19/04; C09K19/42
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
46 words
In an electro-optical display element based on a liquid-crystalline phase comprising at least two compounds, the improvement wherein the electro-optical characteristic curve of the phase in the first Gooch and Tarry transmission minimum is at least as steep as that in the second such transmission minimum.
Claim 2
Dependent Claim
46 words
In an electro-optical display element based on a liquid-crystalline phase comprising at least two compounds, the improvement wherein the electro-optical characteristic curve of the phase in the first Gooch and Tarry transmission minimum is at least as steep as that in the second such transmission minimum.
Claim 3
Dependent Claim
13 words
An electro-optical display element of claim 1, based on a twisted nematic cell.
Claim 4
Dependent Claim
28 words
An electro-optical display element of claim 2, wherein the ratio of the parameter K 3 of said phase to the parameter K 1 of said phase is ≦0.8.
Claim 5
Dependent Claim
26 words
An electro-optical display element of claim 3, wherein the ratio of the parameter Δε of said phase to the parameter Δ.sub.⊥ of said phase is ≦0.3.
Claim 6
Dependent Claim
26 words
An electro-optical display element of claim 2, wherein the ratio of the parameter Δε of said phase to the parameter ε.sub.⊥ of said phase is ≦0.3.
Claim 7
Dependent Claim
28 words
An electro-optical display element of claim 5, wherein the ratio of the parameter K 3 of said phase to the parameter K 1 of said phase is ≦0.8.
Claim 8
Dependent Claim
11 words
An electro-optical display element of claim 5, wherein Δε/ε.sup.⊥ is ≧0.1.
Claim 9
Dependent Claim
28 words
An electro-optical display element of claim 5, wherein the ratio of the parameter K 3 of said phase to the parameter K 1 of said phase is ≦0.7-0.3.
Claim 10
Dependent Claim
28 words
An electro-optical display element of claim 2, wherein the ratio of the parameter K 3 of said phase to the parameter K 1 of said phase is 0.8-0.2.
Claim 11
Dependent Claim
28 words
An electro-optical display element of claim 2, wherein the ratio of the parameter K 3 of said phase to the parameter K 1 of said phase is 0.7-0.3.
Claim 12
Dependent Claim
26 words
An electro-optical display element of claim 10, wherein the ratio of the parameter Δε of said phase to the parameter ε.sub.⊥ of said phase is ≦0.1.
Claim 13
Dependent Claim
68 words
An electro-optical display element of claim 2, wherein the ratio of the parameter K 3 of said phase to the parameter K 1 of said phase is minimized and the ratio of the parameter Δε of said phase to the parameter ε.sub.⊥ of said phase is maximized while the characteristic curve in the first transmission minimum is at least as steep as that in the second transmission minimum.
Claim 14
Dependent Claim
26 words
An electro-optical display element of claim 12, wherein the steepness of the characteristic curve in the first minimum is greater than that in the second minimum.
Claim 15
Dependent Claim
26 words
An electro-optical display element of claim 2, wherein the steepness of the characteristic curve in the first minimum is greater than that in the second minimum.
Claim 16
Dependent Claim
41 words
In a liquid crystal phase comprising at least two compounds, the improvement wherein the electro-optical characteristic curve of the phase in the first Gooch and Tarry transmission minimum is at least as steep as that in the second such transmission minimum.
Claim 17
Dependent Claim
41 words
In a liquid crystal phase comprising at least two compounds, the improvement wherein the electro-optical characteristic curve of the phase in the first Gooch and Tarry transmission minimum is at least as steep as that in the second such transmission minimum.
Claim 18
Dependent Claim
45 words
A phase of claim 15, wherein the ratio of the parameter K 3 of said phase to the parameter K 1 of said phase is ≦0.4 and the ratio of the parameter Δε of said phase to the parameter ε.sub.⊥ of said phase is ≦0.3.
Claim 19
Dependent Claim
45 words
A phase of claim 15, wherein the ratio of the parameter K 3 of said phase to the parameter K 1 of said phase is ≦0.8 and the ratio of the parameter Δε of said phase to the parameter ε.sub.⊥ of said phase is ≦0.5.
Claim 20
Independent Claim
96 words
A method of simultaneously minimizing the dependence of contrast on the angle of observation of an electro-optical display element based on a liquid crystal phase and of maximizing the multiplexing capacity of said element by maximizing the steepness of the characteristic curve of said element, comprising operating the element in the first Gooch and Tarry transmission minimum, and selecting a phase having a K 3 /K 1 ratio and a Δε/ε.sub.⊥ ratio consistent with the attainment of a characteristic curve in the first transmission minimum which is steeper than that in the second such transmission minimum.
Claim 21
Independent Claim
96 words
A method of simultaneously minimizing the dependence of contrast on the angle of observation of an electro-optical display element based on a liquid crystal phase and of maximizing the multiplexing capacity of said element by maximizing the steepness of the characteristic curve of said element, comprising operating the element in the first Gooch and Tarry transmission minimum, and selecting a phase having a K 3 /K 1 ratio and a Δε/ε.sub.⊥ ratio consistent with the attainment of a characteristic curve in the first transmission minimum which is steeper than that in the second such transmission minimum.
References Cited (Backward Citations)
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