Disclosed are liquid crystal displays utilizing an electrically insulative hermetic seal for enclosing the liquid crystalline material between the plates of the display. The seal provides a durable improved barrier to the penetration of vapor into the display by being the crosslinked thermoset product of a composition comprising at least one phenoxy resin and at least one epoxy resin in conjunction with a sufficient amount of crosslinking agent to crosslink the composition sufficiently to provide the seal with improved resistance to vapor penetration.
A display panel having a pair of spaced apart flexible substrates and a display medium sandwiched therebetween. A multiple seal contains the display medium between the substrates and maintains the substrates in spaced separation. The multiple seal includes a first seal for strongly adhering to the substrates and a second seal for forming a low water permeability seal. A process for the production of a display panel having a pair of spaced apart flexible substrates and a display medium sandwiched therebetween. A first sealant which strongly adheres to the substrates is printed on the interior surface of one substrate. A second seal, which has low water permeability, is printed on the other substrate. A spacer is scattered on at least one of the substrates. The substrates are combined together and the sealants are cured to form a display panel.
An electro-optic device useful as a vehicular mirror or panel, an architectural panel, or the like includes two optically transparent substrates positioned in spaced relation to each other. An electro-optic medium having a light transmittance which is variable with the application of an electric field is captured in the space between the substrates. Indicia is applied to one of the inside surfaces of the substrates. In one aspect of the invention, a dielectric material is used for the indicia. The indicia remain visible for viewing at all times during operation of the device.
A sealant composition to seal the fill port in a liquid crystal display is disclosed. The subject composition is comprised of a diglycidylether of bisphenol A epoxy precursor, a curing agent therefor and, optionally, a minor amount of a thixotropic agent.
In a reflector-diffuser type liquid crystal display cell, the control electrodes, which are transparent, electronic components and tracks connecting the components to the cell terminals are disposed between the cell front plate and the liquid crystal layer. The counter electrode is disposed on the other side of the liquid crystal layer and has a frosted rough light reflecting and diffusing face over its entire surface situated in the display area and thus itself functions as the cell reflector-diffuser.
The described cell comprises a mixture of liquid crystals (26), polarizers (28, 30) and alignment layers (22,24). The liquid crystals mixture includes a chiralic compound which induces a helical structure having a pitch greater than or equal to the thickness of the liquid crystal layer. One alignment layer (24) induces a planar alignment, the other (22) induces a hemeotropic alignment. This cell, of low cost, requires low control voltage and provides a very good contrast and a high multiplexing rate. It may be used to advantage in the manufacture of dots matrix display watches.
