Liquid crystal display including dopant phase-separated from liquid crystal
First Claim
1. A method of manufacturing a liquid crystal device which includes a cell comprising a layer of liquid crystal material contained between two substrates, the method comprising the steps of:
- (a) adding to the liquid crystal material under predetermined applied conditions a dopant which is miscible with the liquid crystal material under said conditions; and
(b) changing the conditions applied to the liquid crystal material so as to cause separation of the dopant out of the liquid crystal material which provides a plurality of anisotropic nucleation points for controlling domain formation within the liquid crystal material and keeping the liquid crystal material alignment.
1 Assignment
0 Petitions
Accused Products
Abstract
A mixture of a ferroelectric or anti-ferroelectric liquid crystal material and a monomer having a single photopolymeric functional group is injected in the space between two electrode substrates while heat is applied. After cooling of the mixture it is irradiated with ultraviolet light at a temperature at which the liquid crystal material remains in the smectic phase so as to polymerise the monomer. Areas of liquid crystal material requiring different threshold voltages for switching are thereby produced. Alternatively such areas can be produced by changing the conditions applied to a mixture of liquid crystal material with a suitable dopant so as to cause separation of the dopant out of the liquid crystal material in order to provide a polarity of nucleation points for controlling domain formation within the liquid crystal material. Such control of domain formation can be used to provide greyscale in a liquid crystal device.
-
Citations
20 Claims
-
1. A method of manufacturing a liquid crystal device which includes a cell comprising a layer of liquid crystal material contained between two substrates, the method comprising the steps of:
-
(a) adding to the liquid crystal material under predetermined applied conditions a dopant which is miscible with the liquid crystal material under said conditions; and (b) changing the conditions applied to the liquid crystal material so as to cause separation of the dopant out of the liquid crystal material which provides a plurality of anisotropic nucleation points for controlling domain formation within the liquid crystal material and keeping the liquid crystal material alignment. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of manufacturing a liquid crystal device which includes a cell comprising a layer of liquid crystal material contained between two substrates, the method comprising the steps of:
-
(a) adding to the liquid crystal material under predetermined applied conditions a dopant which is miscible with the liquid crystal material under said conditions; and (b) changing the temperature of the liquid crystal material so as to cause separation of the dopant out of the liquid crystal material in order to provide a plurality of nucleation points for controlling domain formation within the liquid crystal material. - View Dependent Claims (9, 10, 11)
-
-
12. A method of manufacturing a liquid crystal device which includes a cell comprising a layer of liquid crystal material contained between two substrates, the method comprising the steps of:
-
(a) adding to the liquid crystal material under predetermined applied conditions a dopant which is miscible with the liquid crystal material under said conditions; and (b) changing the phase of the liquid crystal material so as to cause separation of the dopant out of the liquid crystal material in order to provide a plurality of nucleation points for controlling domain formation within the liquid crystal material. - View Dependent Claims (13, 14, 15)
-
-
16. A method of manufacturing a liquid crystal device which includes a cell comprising a layer of liquid crystal material contained between two substrates, the method comprising the steps of:
-
(a) adding to the liquid crystal material under predetermined applied conditions a dopant which is miscible with the liquid crystal material under said conditions; and (b) changing the phase of the dopant so as to cause separation of the dopant out of the liquid crystal material in order to provide a plurality of nucleation points for controlling domain formation within the liquid crystal material.
-
-
17. A liquid crystal device including a cell comprising a layer of liquid crystal material contained between two substrates, the liquid crystal material incorporating a dopant which has been mixed with the liquid crystal material under predetermined applied conditions and which has been caused to separate out of the liquid crystal material due to a change in the applied conditions in order to provide a plurality of anisotropic nucleation points for controlling domain formation within the liquid crystal material and keeping the liquid crystal material alignment.
-
18. A method of manufacturing a liquid crystal device which includes a cell comprising a layer of liquid crystal material contained between two substrates, the method comprising the steps of:
-
(a) adding to the liquid crystal material under predetermined applied conditions a dopant which is miscible with the liquid crystal material under said conditions; and (b) applying ultraviolet radiation to the liquid crystal material or the dopant so as to cause separation of the dopant out of the liquid crystal material in order to provide a plurality of nucleation points for controlling transitions between two alignment states of the liquid crystal device.
-
-
19. A method of manufacturing a pi-cell liquid crystal device which includes a cell comprising a layer of liquid crystal material contained between two substrates, the method comprising the steps of:
-
(a) adding to the liquid crystal material under predetermined applied conditions a dopant which is miscible with the liquid crystal material under said conditions; and (b) applying ultraviolet radiation to the liquid crystal material or the dopant so as to cause separation of the dopant out of the liquid crystal material in order to provide a plurality of nucleation points for controlling nucleation of V states in the liquid crystal device.
-
-
20. A method of manufacturing a liquid crystal device which includes a cell comprising a layer of liquid crystal material contained between two substrates, the method comprising the steps of:
-
(a) adding to the liquid crystal material under predetermined applied conditions a dopant which is miscible with the liquid crystal material under said conditions; and (b) changing the conditions applied to the liquid crystal material so as to cause separation of the dopant out of the liquid crystal material in order to provide a plurality of nucleation points for controlling domain formation within the liquid crystal material, wherein two or more dopants are added to the liquid crystal material and separation of the dopants out of the liquid crystal material occurs under different conditions in order to provide a wide area between 0% and 100% switching curves.
-
Specification