# US 11,910,676 B2 · Display device

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- Number: US 11,910,676 B2
- Document ID: US11910676B2
- Status: Granted
- Kind: B2
- Application number: 17/836,150
- Filed: 2022-06-09
- Published: 2022-10-06
- Granted: 2024-02-20
- Earliest claimed: 2005-01-31
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Hajime Kimura
- Web page: https://patentgrep.com/patent/US11910676B2

## CPC

- H10D 86/441: {Interconnections, e.g. scanning lines}
- G09G 3/3225: using an active matrix
- H10D 86/60: wherein the TFTs are in active matrices
- H10K 59/1213: {the pixel elements being TFTs}
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0852: being a dynamic memory with more than one capacitor
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 2102/341: {Short-circuit prevention}
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- 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)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

In view of the problem that a reduced thickness of an EL film causes a short circuit between an anode and a cathode and malfunction of a transistor, the invention provides a display device that has a light emitting element including an electrode and an electroluminescent layer, a wire electrically connected to the electrode of the light emitting element, a transistor provided with an active layer including a source, a drain and a channel forming region, and a power supply line electrically connected to one of the source and the drain of the transistor, wherein the wire is electrically connected to the other of the source and the drain of the transistor, and the width of a part of the electrode in the vicinity of a portion where the electrode is electrically connected to the wire is smaller than that of the electrode in the other portion.

## Claims

### Claim 1

A display device comprising a pixel, the pixel comprising:
a light-emitting element over a substrate;
a first transistor over the substrate; and
a first wiring electrically connected to one of a source and a drain of the first transistor,
wherein the first wiring is a power supply line and configured to supply current to the light-emitting element,
wherein the first wiring comprises a first region overlapping with a contact hole and a second region having a width narrower than a width of the first region, and
wherein the first region of the first wiring does not overlap with a pixel electrode of the light-emitting element.

### Claim 2

A display device comprising a pixel, the pixel comprising:
a light-emitting element over a substrate;
a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a sixth transistor over the substrate;
a first wiring electrically connected to one of a source and a drain of the first transistor; and
a second wiring electrically connected to one of a source and a drain of the second transistor,
wherein the other of the source and the drain of the first transistor is electrically connected to the other of the source and the drain of the second transistor and one of a source and a drain of the third transistor,
wherein the other of the source and the drain of the third transistor is electrically connected to one of a source and a drain of the fourth transistor and one of a source and a drain of the fifth transistor,
wherein the other of the source and the drain of the fourth transistor is electrically connected to the light-emitting element,
wherein the other of the source and the drain of the fifth transistor is electrically connected to one of a source and a drain of the sixth transistor,
wherein the first wiring is a power supply line and configured to supply current to the light-emitting element,
wherein the first wiring comprises a first region overlapping with a contact hole and a second region having a width narrower than a width of the first region, and
wherein the first region of the first wiring does not overlap with a pixel electrode of the light-emitting element.