# US 8,786,810 B2 · Liquid crystal device and electronic apparatus

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- Number: US 8,786,810 B2
- Document ID: US8786810B2
- Status: Granted
- Kind: B2
- Application number: 13/232,309
- Filed: 2011-09-14
- Published: 2012-04-12
- Granted: 2014-07-22
- Earliest claimed: 2010-10-12
- Assignees: Seiko Epson Corporation
- Applicants: Hiroshi Mochiku
- Inventors: Hiroshi Mochiku
- Web page: https://patentgrep.com/patent/US8786810B2

## CPC

- G02F 1/1339: Gaskets; Spacers; Sealing of cells
- G02F 1/134336: {Matrix}
- G02F 1/133388: {with constructional differences between the display region and the peripheral region}
- G02F 2201/50: Protective arrangements
- G09G 2320/046: Dealing with screen burn-in prevention or compensation of the effects thereof
- 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
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A first peripheral electrode and a second peripheral electrode are provided at a peripheral region sandwiched between a pixel region and a seal material in a first substrate of a liquid crystal device, and strength of electric potentials which are applied to the first peripheral electrode, the second peripheral electrode, and a common electrode of an opposite substrate satisfies the condition of the second peripheral electrode<the common electrode<the first peripheral electrode. Therefore, electric fields are formed between the first peripheral electrode and the common electrode, between the second peripheral electrode and the common electrode, and between the first peripheral electrode and the second peripheral electrode.

## Claims

### Claim 1

A liquid crystal device comprising:
a first substrate having a pixel region having a plurality of pixel electrodes arranged at one face side;
a second substrate having a common electrode to which a common potential is applied;
a seal material which bonds the first substrate and the second substrate to each other;
a liquid crystal layer held in a region surrounded by the seal material between the first substrate and the second substrate;
a first peripheral electrode which is provided at a peripheral region located between the pixel region and the seal material at the one face side of the first substrate, and
a second peripheral electrode which is provided at the peripheral region at a position adjacent to the first peripheral electrode,
wherein a constant potential different from the common potential and having a constant polarity is applied to the first peripheral electrode,
a constant potential different from that of the first peripheral electrode and having a constant polarity is applied to the second peripheral electrode, the common electrode overlaps the first peripheral electrode and the second peripheral electrode, and the constant potential which is applied to the first peripheral electrode, the constant potential which is applied to the second peripheral electrode, and the common potential which is applied to the common electrode satisfy the condition of the constant potential applied to the second peripheral electrode<the common potential applied to the common electrode<the constant potential applied to the first peripheral electrode.

### Claim 2 (depends on 1)

The liquid crystal device according to claim 1, wherein the pixel region and the seal material have a quadrangular shape as a whole, and
the first peripheral electrode and the second peripheral electrode are provided at a corner region sandwiched between a corner portion of the pixel region and a corner portion of the seal material.

### Claim 3 (depends on 2)

The liquid crystal device according to claim 2, wherein the first peripheral electrode and the second peripheral electrode are provided only at four corner regions.

### Claim 4 (depends on 3)

A projection type display apparatus provided with the liquid crystal device according to claim 3, the projection type display apparatus comprising:
a light source section that emits light which is supplied to the liquid crystal device; and
a projection optical system that projects light modulated by the liquid crystal device.

### Claim 5 (depends on 2)

The liquid crystal device according to claim 2, wherein the first peripheral electrode and the second peripheral electrode are provided at all of four corner regions,
the first peripheral electrodes disposed at two adjacent corner regions among the four corner regions are connected to each other by a first extension portion which extends along a side portion of the pixel region, and
the second peripheral electrodes disposed at two adjacent corner regions among the four corner regions are connected to each other by a second extension portion which extends along a side portion of the pixel region.

### Claim 6 (depends on 5)

The liquid crystal device according to claim 5, wherein the first peripheral electrode has a larger width dimension than the first extension portion, and
the second peripheral electrode has a larger width dimension than the second extension portion.

### Claim 7 (depends on 6)

A projection type display apparatus provided with the liquid crystal device according to claim 6, the projection type display apparatus comprising:
a light source section that emits light which is supplied to the liquid crystal device; and
a projection optical system that projects light modulated by the liquid crystal device.

### Claim 8 (depends on 5)

A projection type display apparatus provided with the liquid crystal device according to claim 5, the projection type display apparatus comprising:
a light source section that emits light which is supplied to the liquid crystal device; and
a projection optical system that projects light modulated by the liquid crystal device.

### Claim 9 (depends on 1)

The liquid crystal device according to claim 1, wherein the first peripheral electrode and the second peripheral electrode are made of the same electrical conducting material as the plurality of pixel electrodes.

### Claim 10 (depends on 9)

A projection type display apparatus provided with the liquid crystal device according to claim 9, the projection type display apparatus comprising:
a light source section that emits light which is supplied to the liquid crystal device; and
a projection optical system that projects light modulated by the liquid crystal device.

### Claim 11 (depends on 1)

The liquid crystal device according to claim 1, wherein at the first substrate, a plurality of dummy pixel electrodes which is made of the same electrical conducting material as the plurality of pixel electrodes is provided outside the pixel region, and
some of the plurality of dummy pixel electrodes are connected to each other, so that the first peripheral electrode and the second peripheral electrode are constituted.

### Claim 12 (depends on 11)

A projection type display apparatus provided with the liquid crystal device according to claim 11, the projection type display apparatus comprising:
a light source section that emits light which is supplied to the liquid crystal device; and
a projection optical system that projects light modulated by the liquid crystal device.

### Claim 13 (depends on 1)

A projection type display apparatus provided with the liquid crystal device according to claim 1, the projection type display apparatus comprising:
a light source section that emits light which is supplied to the liquid crystal device; and
a projection optical system that projects light modulated by the liquid crystal device.

### Claim 14 (depends on 2)

A projection type display apparatus provided with the liquid crystal device according to claim 2, the projection type display apparatus comprising:
a light source section that emits light which is supplied to the liquid crystal device; and
a projection optical system that projects light modulated by the liquid crystal device.

### Claim 15

A liquid crystal device comprising:
a first substrate having a pixel region, the pixel region having a plurality of pixel electrodes;
a second substrate having a common electrode to which a common potential is applied;
a seal material which bonds the first substrate and the second substrate to each other;
a first electrode which is provided at a first position between the pixel region and the seal material; and
a second electrode which is provided at a second position adjacent to the first electrode,
wherein a first constant potential different from the common potential and having a constant polarity is applied to the first electrode,
a second constant potential different from the first constant potential and having a constant polarity is applied to the second electrode, the common electrode overlaps the first electrode and the second electrode, and the first constant potential, the second constant potential, and the common potential satisfy the condition of the second constant potential<the common potential<the first constant potential.