# US 7,411,294 B2 · Display device having misalignment detection pattern for detecting misalignment between conductive layer and insulating layer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,411,294 B2 - Document ID: US7411294B2 - Status: Granted - Kind: B2 - Application number: 11/095,603 - Filed: 2005-04-01 - Published: 2005-10-20 - Granted: 2008-08-12 - Earliest claimed: 2004-04-14 - Assignees: Hitachi Displays, Ltd. - Inventors: Yasushi Nakano; Shinsaku Chiba - Web page: https://patentgrep.com/patent/US7411294B2 ## CPC - H05K 1/0269: {for visual or optical inspection} - G02F 1/13452: {Conductors connecting driver circuitry and terminals of panels} - H05K 3/243: {characterised by selective plating, e.g. for finish plating of pads (selective plating for making the circuit pattern H05K3/108, H05K3/182)} - H05K 3/28: Applying non-metallic protective coatings {(H05K3/0091 takes precedence; methods for intermediate insulating layers for build-up multilayer circuits H05K3/4673)} - H05K 2201/09781: Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components - H05K 2203/163: Monitoring a manufacturing process - H05K 2203/166: Alignment or registration; Control of registration - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - 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 ## Abstract A display device includes a display panel, and the circuit substrate is separately formed and positioned different from the array substrate of the display panel and connected to the display panel. The circuit substrate includes an insulating substrate, a conductive layer, an insulating layer to cover a part of the conductive layer, a plating layer applied to a portion of the conductive layer which is exposed from the insulating layer due to misalignment between the conductive layer and the insulating layer, and a misalignment detection pattern for detecting the misalignment between the conductive layer and the insulating layer. The misalignment detection pattern has a pattern covered by the insulating layer in a manner to prevent adherence of a plating material to the conductive layer, if the misalignment between the conductive layer and the insulating layer is smaller than a predetermined misalignment tolerance. ## Claims ### Claim 1 A display device comprising a display panel and a circuit substrate connected to the display panel, wherein the display panel includes at least one array substrate, the circuit substrate is separately formed and positioned different from said array substrate and comprises an insulating substrate, a conductive layer, an insulating layer to cover a part of the conductive layer, the conductive layer of the circuit substrate includes a wiring pattern, wiring terminals, and a misalignment detection pattern for detecting the misalignment between the conductive layer and the insulating layer, the wiring terminals are exposed from the insulating layer and are applied with a plating layer to a surface exposed from the insulating layer, and the misalignment between the conductive layer and the insulating layer is smaller than a predetermined misalignment tolerance, and the misalignment detection pattern comprises a pattern covered by the insulating layer in a manner to prevent adherence of a plating material to the conductive layer. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the misalignment detection pattern comprises an opening formed on the insulating layer to allow the insulating substrate to be exposed, and the conductive layer formed at a predetermined distance from the opening to surround the opening and covered by the insulating layer, if the misalignment between the conductive layer and the insulating layer is smaller than a predetermined misalignment tolerance. ### Claim 3 (depends on 2) The display device according to claim 2, wherein the misalignment detection pattern is unitarily continuous to surround the opening thereof. ### Claim 4 (depends on 2) The display device according to claim 2, wherein the conductive layer surrounding the opening of the misalignment detection pattern comprises a plurality of discrete patterns. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the misalignment detection pattern comprises the conductive layer formed to be island-shaped, and the insulating layer formed to be island-shaped to cover the island-shaped conductive layer. ### Claim 6 (depends on 1) The display device according to claim 1, wherein the misalignment detection pattern is conductive and supplied with a predetermined potential. ### Claim 7 (depends on 1) The display device according to claim 1, wherein the conductive layer of the misalignment detection pattern is electrically floating. ### Claim 8 (depends on 1) The display device according to claim 1, wherein the circuit substrate is a flexible printed circuit substrate. ### Claim 9 (depends on 1) The display device according to claim 1, wherein an electronic part is mounted on one of the wiring terminals of the circuit substrate. ### Claim 10 (depends on 1) The display device according to claim 1, wherein the circuit substrate covers a part of a back surface of the display panel. ### Claim 11 (depends on 1) The display device according to claim 1, wherein the circuit substrate covers a part of a side surface of the display panel. ### Claim 12 (depends on 1) The display device according to claim 1, wherein the display panel is a liquid crystal display panel, and the circuit substrate covers a part of a back surface a backlight of the display panel. ### Claim 13 (depends on 12) The display device according to claim 12, wherein a drive circuit chip is mounted on one array substrate of the liquid crystal display panel, and the circuit substrate is connected at one end thereof to the drive circuit chip and at the other end thereof to another substrate provided on the back surface of the backlight. ### Claim 14 (depends on 1) The display device according to claim 1, wherein the display panel is a liquid crystal display panel, an organic electroluminescence (EL) display panel, a field emission type display (FED) panel, or a plasma display panel. ### Claim 15 A display device comprising a display panel and a circuit substrate connected to the display panel, wherein the display panel includes at least one array substrate, the circuit substrate is separately formed and positioned different from said array substrate and comprises an insulating substrate, a conductive layer, an insulating layer to cover a part of the conductive layer, the conductive layer of the circuit substrate includes a wiring pattern, wiring terminals, and a misalignment detection pattern for detecting the misalignment between the conductive layer and the insulating layer, the wiring terminals are exposed from the insulating layer and are applied with a plating layer to a surface exposed from the insulating layer, if the misalignment between the conductive layer and the insulating layer is smaller than a predetermined misalignment tolerance, the misalignment detection pattern comprises a pattern covered by the insulating layer in a manner to prevent adherence of a plating material to the conductive layer, and if the misalignment between the conductive layer and the insulating layer is larger than the predetermined misalignment tolerance, a part of the misalignment detection pattern is exposed from the insulating layer in a manner to be applied with plating. ### Claim 16 (depends on 15) The display device according to claim 15, wherein the misalignment detection pattern comprises an opening formed on the insulating layer to allow the insulating substrate to be exposed, if the misalignment between the conductive layer and the insulating layer is smaller than a predetermined misalignment tolerance, the conductive layer formed at a predetermined distance from the opening to surround the opening and covered by the insulating layer, and if the misalignment between the conductive layer and the insulating layer is larger than the predetermined misalignment tolerance, the conductive layer is exposed from the insulating layer at the opening of the insulating layer. ### Claim 17 (depends on 16) The display device according to claim 16, wherein the conductive layer of the misalignment detection pattern surrounding the opening of the insulating layer is formed as unitarily continuous. ### Claim 18 (depends on 15) The display device according to claim 15, wherein the misalignment detection pattern is conductive and supplied with a predetermined potential. ### Claim 19 (depends on 15) The display device according to claim 15, wherein the circuit substrate is a flexible printed circuit substrate. ### Claim 20 (depends on 15) The display device according to claim 15, wherein an electronic part is mounted on one of the wiring terminals of the circuit substrate. ### Claim 21 (depends on 15) The display device according to claim 15, wherein the circuit substrate covers a part of a back surface of the display panel. ### Claim 22 (depends on 15) The display device according to claim 15, wherein the circuit substrate covers a part of a side surface of the display panel. ### Claim 23 (depends on 15) The display device according to claim 15, wherein the display panel is a liquid crystal display panel, and the circuit substrate covers a part of a back surface a backlight of the display panel. ### Claim 24 (depends on 23) The display device according to claim 23, wherein a drive circuit chip is mounted on one array substrate of the liquid crystal display panel, and the circuit substrate is connected at one end thereof to the drive circuit chip and at the other end thereof to another substrate provided on the back surface of the backlight. ### Claim 25 (depends on 15) The display device according to claim 15, wherein the display panel is a liquid crystal display panel, an organic electroluminescence (EL) display panel, a field emission type display (FED) panel, or a plasma display panel.