Data exhibiting screen device with a liquid-crystal layer, and method of manufacture

Claim 2

In a device according to claim 1, said ferroelectric layer consisting of lead-circonate-titanate ceramic material.

Claim 3

In a device according to claim 1, said electrode means comprising two arrays of parallel electrode conductors conjointly forming an X-Y cross-bar arrangement whose intersections define respective raster spots, respective intermediate electrodes interposed between said two layers at said individual raster spots, said two arrays of conductors being arranged on the respective outer sides of said two layers.

Claim 4

Device according to claim 1, comprising a transparent front electrode adjacent to said liquid crystal layer through which the data indicated by said liquid crystal layer are visible, said electrode means comprising two arrays of electrode conductor members on opposite sides respectively of said ferroelectric layer, the conductor members in each array extending parallel to each other and transverse to those of the other array to conjointly form an X-Y cross-bar arrangement whose intersections define respective raster elements of said ferroelectric layer to act upon adjacent spots of said liquid-crystal layer.

Claim 5

Device according to claim 5, comprising an insulating layer interposed between said ferroelectric layer and said liquid-crystal layer, said insulating layer having respective perforations at said raster spots, whereby said ferroelectric layer is effective to control the optical behavior of said liquid-crystal layer substantially only at said spots.

Claim 6

Device according to claim 4, comprising an insulating layer located between said ferroelectric layer and said liquid-crystal layer and having at each of said raster spots a circular hole whose diameter substantially corresponds to the width of those of said electrode conductors that are situated on the outer side of said ferroelectric layer, said liquid-crystal layer having cylindrical protrusions extending into said respective holes, said intermediate electrodes having a diameter substantially equal to the width of those of said electrode conductors that are situated on the outer side of said liquid-crystal layer, and said intermediate electrodes enveloping said respective protrusions and extending concentrically to said protrusions between said insulating layer and said liquid-crystal layer.

Claim 7

In a device according to claim 1, said electrode means comprising two arrays of parallel electrode conductors conjointly forming an X-Y cross-bar arrangement whose intersections define respective raster spots, direct-voltage supply means, and electronic switching means connected between said supply means and said electrode conductors of said two arrays.

Claim 8

In a device according to claim 1, said electrode means comprising two arrays of parallel electrode conductors conjointly forming an X-Y cross-bar arrangement whose intersections define respective raster spots, a direct-voltage source, respective decoupling diodes connected between said source and said raster spots of said ferroelectrice layer for normally placing said raster spots in saturated condition, and control pulse supply means having a switch connected to said electrode conductors of said two arrays at each of said raster spots for supplying to said spots respective direct-voltage pulses of a given polarity.

Claim 9

Device according to claim 5, comprising an insulating layer interposed between said ferroelectric layer and said liquid-crystal layer, said X-conductor members being disposed on the outer side of said ferroelectric layer, said Y-conductor members being disposed on the ferroelectric layer at the side facing said insulating layer, first electrode spots located at said respective intersections on the Y-conductor side of said ferroelectric layer and insulated from said Y-conductor members, second electrode spots located at said respective intersections on said liquid crystal layer at the side facing said insulating layer and electrically connected with the next adjacent one of said first electrode spots, and a front electrode located on the outer side of said liquid crystal raster elements and common to all of said elements.

Claim 10

In a device according to claim 10, said Y-conductor members having central circular openings at said respective intersections, said liquid-crystal layer having bulges extending through said insulating layer toward each of said respective openings, and a circular read-out electrode surrounding each of said bulges between said insulating layer and said liquid-crystal layer and extending into the adjacent one of said respective openings.

Claim 11

DEvice according to claim 10, comprising direct-voltage means connected to said X-conductor members and said Y-conductor members for controlling said raster elements to be excited in said ferroelectric layer so as to occupy a first remanence state, and direct-voltage pulse control means connected to said X and Y-conductor members and to said common front electrode for energizIng all of the raster elements that are in said first remanence state to flip into the second remanence state.

Claim 12

In a device according to claim 1, said ferroelectric layer being composed of individual pieces of ceramic material, and insulating substance filling the gaps between said pieces.

Claim 13

In a method of producing a data indicating screen device having a layer of liquid crystals whose light scattering or transparency is controllable by an electric field, a layer of ferroelectric ceramic material in parallel proximity to said liquid-crystal layer, two arrays of parallel electrode conductors conjointly forming an X-Y cross-bar arrangement whose intersections define respective raster spots, and respective intermediAte electrodes interposed between said two layers at said individual raster spots, the steps of pressing an insulating photosensitive layer face-to-face upon said ceramic layer so as to bond them together, then exposing said photosensitive insulating layer to illumination at said raster spots and thereafter etching holes into said insulating layer at the exposed spots, and vapor-depositing said intermediate electrodes upon said insulating layer around said respective holes.