# US 5,706,022 A · Optical display device having an optically transparent driver circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,022 A - Document ID: US5706022A - Status: Granted - Kind: A - Application number: 08/393,679 - Filed: 1995-02-24 - Granted: 1998-01-06 - Earliest claimed: 1994-03-15 - Assignees: Fujitsu Limited - Inventors: Tsunehiro Hato - Web page: https://patentgrep.com/patent/US5706022A ## CPC - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - H10H 29/142: {Two-dimensional arrangements, e.g. asymmetric LED layout} - G02F 1/1347: Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A display device includes an optically transparent substrate, an optically transparent driver circuit provided on the substrate, and a display element provided on the driver circuit in electrical connection therewith, wherein the display element causes a change in optical state in response to a drive signal supplied from the driver circuit. ## Claims ### Claim 1 A display device for visually displaying information, comprising: an optically transparent substrate; an optically transparent driver circuit provided on said substrate; and a display element provided on said driver circuit in electrical connection therewith, said display element causing a change in optical state in response to a drive supplied from said driver circuit, wherein said driver circuit comprises a transistor having an active part formed of an optically transparent dielectric material, wherein said driver circuit is provided so as to overlap with said display element when viewed in a direction perpendicular to said substrate. ### Claim 2 (depends on 1) A display device as claimed in claim 1, wherein said driver circuit comprises a dielectric base transistor, said dielectric base transistor comprising: a dielectric base including an optically transparent first dielectric layer having a first dielectric constant, and an optically transparent second dielectric layer having a second dielectric constant that is smaller than said first dielectric constant and provided on said first dielectric layer; an emitter electrode formed of an optically transparent material and provided on said second dielectric layer forming said dielectric base; a collector electrode formed of an optically transparent material and provided on said second dielectric layer forming said dielectric base; and a base electrode formed of an optically transparent material and provided on said dielectric base in electrical connection with said first dielectric layer. ### Claim 3 (depends on 2) A display device as claimed in claim 2, wherein said emitter electrode is connected to said display element electrically. ### Claim 4 (depends on 2) A display device as claimed in claim 2, wherein said dielectric base transistor includes a base electrode layer of a transparent conductor formed on a surface of said substrate in electrical connection with said base electrode; said dielectric base is formed on said base electrode layer; and wherein said emitter electrode and said collector electrode are provided on said first dielectric layer forming said dielectric base. ### Claim 5 (depends on 2) A display device as claimed in claim 2, wherein said dielectric base transistor includes a collector electrode layer of a transparent conductor provided on a surface of said substrate in electrical connection with said collector electrode; said dielectric base is provided on said collector electrode; said base electrode is provided on said second dielectric layer forming said dielectric base; and wherein said collector layer is formed on said first dielectric layer forming said dielectric base. ### Claim 6 (depends on 1) A display device as claimed in claim 1, wherein said display element comprises a light emitting element that emits a light in response to said drive signal. ### Claim 7 (depends on 1) A display device as claimed in claim 1, wherein said display device comprises a liquid crystal device that interrupts a transmission of light passing therethrough in response to said drive signal. ### Claim 8 (depends on 7) A display device as claimed in claim 7, wherein said liquid crystal device comprises: a first electrode connected to said driver circuit; a second electrode provided above said first electrode with a separation therefrom; a liquid crystal layer held between said first and second electrodes; a first molecular alignment film provided on said first electrode for causing a molecular alignment in said liquid crystal layer; and a second molecular alignment film provided on said second electrode for causing a molecular alignment in said liquid crystal layer. ### Claim 9 (depends on 8) A display device as claimed in claim 8, wherein said first electrode comprises a plurality of electrode elements disposed in rows and columns and forming a first group electrode elements; wherein said second electrode comprises a plurality of electrode elements disposed in rows and columns in correspondence to said first group electrode elements and forming a second group electrode elements, each of said second group electrode elements facing a corresponding first group electrode element, each of said first group elements and a corresponding second group element thereby defining a pixel; and wherein said drive circuit comprises a dielectric base transistor, said dielectric base transistor having a base of a dielectric material and being provided in correspondence to each of said pixels. ### Claim 10 A display device for visually displaying information, comprising: a plurality of display panels stacked with each other, each of said plurality of display panels comprising: an optically transparent substrate; an optically transparent driver circuit provided on said substrate; and a display element provided on said driver circuit in electrical connection therewith, said display element causing a change in optical state in response to a drive signal supplied from said driver circuit, wherein, in each of said plurality of panels, said display element comprises a liquid crystal device, said liquid crystal device comprising: a first electrode connected to said driver circuit; a second electrode provided above said first electrode with a separation therefrom so as to face said first electrode; a liquid crystal layer held between said first and second electrodes; a first molecular alignment film provided on said first electrode; and a second molecular alignment film provided on said second electrode; said first electrode comprising a plurality of electrode elements disposed in rows and columns and forming a first group of electrode elements; said second electrode comprising a plurality of electrode elements disposed in rows and columns and forming a second group of electrode elements, each of said second group of electrode elements facing a corresponding electrode element of said first group, each electrode element of said first group and a corresponding electrode element of said second group defining a pixel; and wherein said driver circuit comprises a plurality of dielectric base transistors each provided in correspondence to a pixel, each of said dielectric base transistors having a dielectric base that includes a stacking of dielectric layers. ### Claim 11 (depends on 9) A display device as claimed in claim 9, wherein said plurality of panels includes a first panel corresponding to a first color of the three primary colors, a second panel provided on said first panel and corresponding to a second color of the three primary colors, a third panel provided on said second panel and corresponding to a third color of the three primary colors, and a filter plate provided on the third panel; wherein said filter plate includes: a first filter element provided in correspondence to said first and second group electrode elements for selectively passing a light of said first primary color; a second filter element provided in correspondence to said first and second group electrode elements for passing a of said second primary color; and a third filter element provided in correspondence to said first and second group electrode elements for selectively passing a light of said third primary color. ### Claim 12 (depends on 10) A display device as claimed in claim 10, wherein said display device further includes a planar light source disposed below a stack of said display panels. ### Claim 13 (depends on 10) A display device as claimed in claim 10, wherein each of said plurality of panels includes a plurality of optically transparent substrate elements, said substrate elements being connected with each other with an angle such that said plurality of substrate elements define a curved surface. ### Claim 14 (depends on 10) A display device as claimed in claim 10, wherein each of said plurality of panels forms a spherical shell such that said plurality of panels form a spherical body as a result of stacking. ### Claim 15 (depends on 14) A display device as claimed in claim 14, wherein said spherical body has a hollow space at a central part thereof, and wherein said display device further includes a light source accommodated in said hollow space. ### Claim 16 (depends on 10) A display device as claimed in claim 10, wherein said plurality of panels have a disk shape having a diameter that changes disk by disk, said plurality of disks being stacked to form a spherical body. ### Claim 17 (depends on 10) A display device as claimed in claim 10, wherein each of said plurality of panels has a form of cylindrical shell and wherein said cylindrical shells are stacked coaxially with each other to form said display device. ### Claim 18 (depends on 2) A display device as claimed in claim 2, wherein said driver circuit includes an additional dielectric base transistor forming a redundant circuit.