# US 2020/0271978 A1 · Electro-optical device and electronic apparatus

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- Number: US 2020/0271978 A1
- Document ID: US20200271978A1
- Status: Published application
- Kind: A1
- Application number: 16/800,013
- Filed: 2020-02-25
- Published: 2020-08-27
- Earliest claimed: 2019-02-26
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Shinsuke FUJIKAWA
- Web page: https://patentgrep.com/patent/US20200271978A1

## CPC

- G02F 1/13452: {Conductors connecting driver circuitry and terminals of panels}
- H05K 1/147: {at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit (H05K1/148 takes precedence)}
- G02F 1/136204: {Arrangements to prevent high voltage or static electricity failures}
- H05K 1/0268: {for electrical inspection or testing}
- H05K 1/144: {Stacked arrangements of planar printed circuit boards}
- H05K 1/189: characterised by the use of flexible or folded printed circuits
- G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)}
- H05K 2201/09281: Layout details of a single conductor
- H05K 2201/10128: Display
- H05K 2201/10136: Liquid Crystal display [LCD]
- 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
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A liquid crystal apparatus includes a first wiring substrate on which a first driving IC is mounted, a second wiring substrate disposed to overlap the first wiring substrate, a first terminal group electrically connected to the first wiring substrate and including a terminal electrically connected to the first driving IC, a second terminal group electrically connected to the second wiring substrate and including another terminal electrically connected to the terminal, and a monitoring pad provided on the second wiring substrate and electrically connected to the other terminal.

## Claims

### Claim 1

An electro-optical device comprising:
a first wiring substrate on which a first driving element is mounted;
a second wiring substrate disposed to overlap the first wiring substrate;
a first terminal group electrically connected to the first wiring substrate and including a first terminal electrically connected to the first driving element;
a second terminal group electrically connected to the second wiring substrate and including a second terminal electrically connected to the first terminal; and
a monitor unit provided on the second wiring substrate and electrically connected to the second terminal.

### Claim 2 (depends on 1)

The electro-optical device according to claim 1, wherein
the monitor unit is not electrically connected to the second driving element mounted on the second wiring substrate.

### Claim 3 (depends on 2)

The electro-optical device according to claim 2, wherein
the second wiring substrate is provided with a disconnection portion at which wiring electrically connecting the second driving element mounted on the second wiring substrate and the monitor unit is disconnected.

### Claim 4 (depends on 1)

The electro-optical device according to claim 1, comprising:
a connecting portion configured to electrically connect the first terminal and the second terminal, wherein
the connecting portion is provided in a layer below a layer in which the first terminal and the second terminal are provided.

### Claim 5 (depends on 1)

The electro-optical device according to claim 1, wherein
the monitor unit is disposed closer to the second terminal group than other monitor units electrically connected to the second driving element.

### Claim 6 (depends on 1)

The electro-optical device according to claim 1, wherein
the first terminal group comprises a third terminal electrically connected to the first driving element,
the second terminal group includes a fourth terminal electrically connected to the third terminal, and
the second wiring circuit includes another monitor unit electrically connected to the fourth terminal.

### Claim 7 (depends on 1)

An electronic apparatus comprising the electro-optical device according to claim 1.