# US 8,772,783 B2 · Display device

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- Number: US 8,772,783 B2
- Document ID: US8772783B2
- Status: Granted
- Kind: B2
- Application number: 11/240,568
- Filed: 2005-10-03
- Published: 2006-04-20
- Granted: 2014-07-08
- Earliest claimed: 2004-10-14
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Misako Hirosue; Masahiro Katayama; Shunpei Yamazaki
- Inventors: Misako Hirosue; Masahiro Katayama; Shunpei Yamazaki
- Web page: https://patentgrep.com/patent/US8772783B2

## CPC

- H10D 86/00: Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D 86/0241: {using liquid deposition, e.g. printing}
- H10F 39/8023: {Disposition of the elements in pixels, e.g. smaller elements in the centre of the imager compared to larger elements at the periphery}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 71/166: {using selective deposition, e.g. using a mask}
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

The invention provides a technique to manufacture a display device with high image quality and reliability at low cost with high yield. According to the invention, a spacer is provided over a pixel electrode layer in a pixel region. Moreover, a surface of an insulating layer which functions as a partition which covers the periphery of the pixel electrode layer is formed at a high position from the surface of the pixel electrode due to stacked layers under the insulating layer. These spacer and insulator which function as a spacer support a mask used for selectively forming a light emitting material over a pixel electrode layer, thereby preventing the mask from contacting the pixel electrode layer due to a twist and deflection of the mask. Accordingly, such a damage as a crack does not occur in the pixel electrode layer which results in having no defect in shape. Therefore, a display device which performs a high resolution display with high reliability can be manufactured.

## Claims

### Claim 1

A display device comprising:
a pixel comprising:
a substrate;
a semiconductor layer over the substrate;
a gate insulating layer over the semiconductor layer;
a gate electrode layer over the gate insulating layer;
an insulating layer over the gate electrode layer;
a source electrode layer or a drain electrode layer over the insulating layer;
a first electrode layer in contact with the source electrode layer or the drain electrode layer over the insulating layer;
an insulator covering and being in contact with the insulating layer, the source electrode layer or the drain electrode layer, and a portion of the first electrode layer;
an electroluminescent layer over and in contact with a first surface of the first electrode layer and the insulator; and
a second electrode layer over and in contact with the electroluminescent layer and the insulator,
wherein the insulator has a first projection portion over a region where the source electrode layer or the drain electrode layer overlaps with the gate electrode layer,
wherein the insulator has a second projection portion over the source electrode layer or the drain electrode layer, wherein the second projection portion does not overlap with the gate electrode layer,
wherein a height of the first projection portion from a surface of the substrate is higher than a height of the second projection portion from the surface of the substrate;
wherein the insulator covers a periphery of the first electrode layer, and
wherein the insulator crosses over the first surface of the first electrode layer parallel to a short side of the first surface of the first electrode layer in two places so that the insulator has a first aperture, a second aperture and a third aperture overlapping with the first surface of the first electrode layer.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the first electrode layer is a pixel electrode layer.

### Claim 3 (depends on 1)

The display device according to claim 1, further comprising:
a passivation film over the second electrode layer and the insulator.

### Claim 4 (depends on 1)

An electronic device having the display device according to claim 1, wherein the electronic device is one selected from the group consisting of a video camera, a digital camera, a projector, a head mounted display, a car navigation, a car stereo, a personal computer, a game machine, a mobile computer, a portable phone, an electronic book, and an image reproducing device.

### Claim 5 (depends on 1)

The display device according to claim 1, the insulator has a depressed portion between the first projection portion and the second projection portion.

### Claim 6

A display device comprising:
a pixel comprising:
a substrate;
a thin film transistor including a semiconductor layer, a gate electrode layer and a gate insulating layer between the semiconductor layer and the gate electrode layer over the substrate;
an insulating layer over the thin film transistor;
a source electrode layer or a drain electrode layer over the insulating layer;
a first electrode layer in contact with the source electrode layer or the drain electrode layer over the insulating layer;
an insulator covering and being in contact with the insulating layer, the source electrode layer or the drain electrode layer, and a portion of the first electrode layer;
an electroluminescent layer over and in contact with a first surface of the first electrode layer and the insulator; and
a second electrode layer over and in contact with the electroluminescent layer and the insulator,
wherein the insulator has a first projection portion over a region where the source electrode layer or the drain electrode layer overlaps with the gate electrode layer,
wherein the insulator has a second projection portion over the source electrode layer or drain electrode layer, wherein the second projection portion does not overlap with the gate electrode layer,
wherein a height of the first projection portion from a surface of the substrate is higher than a height of the second projection portion from the surface of the substrate;
wherein the insulator covers a periphery of the first electrode layer, and
wherein the insulator crosses over the first surface of the first electrode layer parallel to a short side of the first surface of the first electrode layer in two places so that the insulator has a first aperture, a second aperture and a third aperture overlapping with the first surface of the first electrode layer.

### Claim 7 (depends on 6)

The display device according to claim 6, wherein the first electrode layer is a pixel electrode layer.

### Claim 8 (depends on 6)

The display device according to claim 6, further comprising:
a passivation film over the second electrode layer and the insulator.

### Claim 9 (depends on 6)

An electronic device having the display device according to claim 6, wherein the electronic device is one selected from the group consisting of a video camera, a digital camera, a projector, a head mounted display, a car navigation, a car stereo, a personal computer, a game machine, a mobile computer, a portable phone, an electronic book, and an image reproducing device.

### Claim 10 (depends on 6)

The display device according to claim 6, the insulator has a depressed portion between the first projection portion and the second projection portion.