# US 10,120,250 B2 · Electro-optical device, electrical apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,120,250 B2 - Document ID: US10120250B2 - Status: Granted - Kind: B2 - Application number: 15/694,447 - Filed: 2017-09-01 - Published: 2018-03-08 - Granted: 2018-11-06 - Earliest claimed: 2016-09-08 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Shotaro Izawa; Satoshi Ito - Web page: https://patentgrep.com/patent/US10120250B2 ## CPC - G02F 1/136213: {Storage capacitors associated with the pixel electrode} - G02F 1/133345: {Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence)} - G02F 1/134309: {characterised by their geometrical arrangement} - G02F 1/136286: {Wiring, e.g. gate line, drain line} - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - H10D 30/6715: {characterised by the doping profiles, e.g. having lightly-doped source or drain extensions} - H10D 30/6723: {having light shields} - H10D 30/6732: {Bottom-gate only TFTs} - H10D 30/6745: {Polycrystalline or microcrystalline silicon} - H10D 86/421: {having a particular composition, shape or crystalline structure of the active layer} - H10D 86/441: {Interconnections, e.g. scanning lines} - H10D 86/481: {integrated with passive devices, e.g. auxiliary capacitors} - H10D 86/60: wherein the TFTs are in active matrices - G02F 1/136218: {Shield electrodes} - G02F 2201/121: common or background - G02F 2201/123: pixel - 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 - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract A liquid crystal device serves as an electro-optical device and includes, on a base member of an element substrate, a first shield layer disposed between a gate electrode and a drain electrode of a TFT, and a second shield layer provided between the drain electrode and a data line serving as a signal line. A first holding capacitor is configured by part of the drain electrode, the first dielectric layer, and the second shield layer. ## Claims ### Claim 1 An electro-optical device comprising: an element substrate including a pixel electrode and a thin film transistor for each of a plurality of pixels, a scan line, and a signal line; and on the element substrate, a drain electrode disposed between a gate electrode of the thin film transistor and the signal line, a first shield layer disposed between the gate electrode and the drain electrode and configured to be applied with a fixed potential, a first dielectric layer disposed between the drain electrode and the signal line and provided contacting part of the drain electrode, a second shield layer contacting the first dielectric layer, and a fixed potential line disposed between the second shield layer and the pixel electrode and configured to be applied with the fixed potential, the second shield layer being connected to the fixed potential line, and the drain electrode, the first dielectric layer, and the second shield layer configuring a first holding capacitor. ### Claim 2 An electro-optical device comprising: an element substrate including a pixel electrode and a thin film transistor for each of a plurality of pixels, a scan line, and a signal line; and on the element substrate, a drain electrode disposed between a gate electrode of the thin film transistor and the signal line, a first shield layer disposed between the gate electrode and the drain electrode and configured to be applied with a fixed potential, a first dielectric layer disposed between the drain electrode and the signal line and provided contacting part of the drain electrode, a projection having insulating properties and disposed between the drain electrode and the first dielectric layer, a second shield layer contacting the first dielectric layer, and a fixed potential line disposed between the second shield layer and the pixel electrode and configured to be applied with the fixed potential, the second shield layer being connected to the fixed potential line at a portion of the fixed potential line superimposed on the projection in plan view of the element substrate; and the drain electrode, the first dielectric layer, and the second shield layer configuring a first holding capacitor. ### Claim 3 (depends on 1) The electro-optical device according to claim 1, wherein: the scan line extends along a first direction, and part of the scan line acts as the gate electrode; and the first shield layer extends in the first direction superimposed on the scan line in plan view of the element substrate. ### Claim 4 (depends on 2) The electro-optical device according to claim 2, wherein: the scan line extends along a first direction, and part of the scan line acts as the gate electrode; and the first shield layer extends in the first direction superimposed on the scan line in plan view of the element substrate. ### Claim 5 (depends on 3) The electro-optical device according to claim 3, wherein: the signal line extends in a second direction intersecting the first direction; and the fixed potential line extends in the second direction superimposed on the signal line in plan view of the element substrate. ### Claim 6 (depends on 4) The electro-optical device according to claim 4, wherein: the signal line extends in a second direction intersecting the first direction; and the fixed potential line extends in the second direction superimposed on the signal line in plan view of the element substrate. ### Claim 7 (depends on 1) The electro-optical device according to claim 1, wherein: the electro-optical device further comprises a trench provided in an intermediate insulation film between the fixed potential line and the pixel electrode; and a second holding capacitor configured by a first capacitor electrode covering at least the trench, a second dielectric layer contacting the first capacitor electrode, and a second capacitor electrode contacting the second dielectric layer; and the first capacitor electrode and the fixed potential line are connected together at a portion at the bottom of the trench; the pixel electrode is connected to the drain electrode through the second capacitor electrode. ### Claim 8 (depends on 2) The electro-optical device according to claim 2, wherein: the electro-optical device further comprises a trench provided in an intermediate insulation film between the fixed potential line and the pixel electrode; and a second holding capacitor configured by a first capacitor electrode covering at least the trench, a second dielectric layer contacting the first capacitor electrode, and a second capacitor electrode contacting the second dielectric layer; and the first capacitor electrode and the fixed potential line are connected together at a portion at the bottom of the trench; the pixel electrode is connected to the drain electrode through the second capacitor electrode. ### Claim 9 (depends on 1) The electro-optical device according to claim 1, wherein: the electro-optical device further comprises an opposing substrate including a common electrode that is disposed facing across a liquid crystal layer toward the plurality of pixel electrodes of the element substrate; and a potential applied to the common electrode and the fixed potential are the same potential as each other. ### Claim 10 (depends on 2) The electro-optical device according to claim 2, wherein: the electro-optical device further comprises an opposing substrate including a common electrode that is disposed facing across a liquid crystal layer toward the plurality of pixel electrodes of the element substrate; and a potential applied to the common electrode and the fixed potential are the same potential as each other. ### Claim 11 (depends on 1) An electrical apparatus comprising the electro-optical device according to claim 1. ### Claim 12 (depends on 2) An electrical apparatus comprising the electro-optical device according to claim 2. ### Claim 13 (depends on 3) An electrical apparatus comprising the electro-optical device according to claim 3. ### Claim 14 (depends on 4) An electrical apparatus comprising the electro-optical device according to claim 4. ### Claim 15 (depends on 5) An electrical apparatus comprising the electro-optical device according to claim 5. ### Claim 16 (depends on 6) An electrical apparatus comprising the electro-optical device according to claim 6. ### Claim 17 (depends on 7) An electrical apparatus comprising the electro-optical device according to claim 7. ### Claim 18 (depends on 8) An electrical apparatus comprising the electro-optical device according to claim 8. ### Claim 19 (depends on 9) An electrical apparatus comprising the electro-optical device according to claim 9. ### Claim 20 (depends on 10) An electrical apparatus comprising the electro-optical device according to claim 10.