Organic light-emitting diode display and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016111484-A1
Application number	US-201514644049-A
Country	US
Kind code	A1
Filing date	Mar 10, 2015
Priority date	Oct 16, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

An OLED display and a method of manufacturing the same are disclosed. In one aspect, the display device includes a plurality of pixels, wherein each of the pixels includes a plurality of wires including a first wire extending in a first direction and a second wire extending in a second direction crossing the first direction, the second wire having top and bottom portions opposing each other. The pixels also include a plurality of switching TFTs electrically connected to the wires, a driving TFT configured to supply a driving current, a storage capacitor electrically connected to the wires and the driving TFT, and a connecting wire electrically connecting the driving TFT to a selected one of the switching TFTs, wherein the connecting wire has top and bottom portions opposing each other, and wherein at least the top portions of the connecting wire and the second wire are formed on different layers.

First claim

What is claimed is:

1 . A display device comprising a plurality of pixels, wherein each of the pixels comprises:
a plurality of wires comprising a first wire extending in a first direction and a second wire extending in a second direction crossing the first direction, wherein the second wire has top and bottom portions opposing each other; a plurality of switching thin-film transistors (TFTs) electrically connected to the wires; a driving TFT configured to supply a driving current; a storage capacitor electrically connected to the wires and the driving TFT; and a connecting wire electrically connecting the driving TFT to a selected one of the switching TFTs, wherein the connecting wire has top and bottom portions opposing each other, and wherein at least the top portions of the connecting wire and the second wire are formed on different layers.

2 . The display device of claim 1 , wherein the first wire comprises a scanning line configured to provide a scanning signal, and wherein the second wire comprises a data line configured to provide a data signal.

3 . The display device of claim 1 , wherein the top portion of the connecting wire is formed below the top portion of the second wire.

4 . The display device of claim 3 , wherein the driving TFT comprises a driving gate electrode, and wherein the connecting wire is formed over the driving gate electrode.

5 . The display device of claim 1 , wherein the storage capacitor comprises first and second electrodes, and wherein the top portion of the connecting wire is formed on the same layer as at least a portion of the second electrode.

6 . The display device of claim 5 , wherein the driving TFT comprises a driving gate electrode,
wherein the first electrode of the storage capacitor is electrically connected to the driving gate electrode, and wherein the connecting wire has i) one lateral end electrically connected to the one of the switching TFTs via a first contact hole and ii) another lateral end electrically connected to the first electrode of the storage capacitor through a second contact hole.

7 . The display device of claim 6 , wherein the second electrode of the storage capacitor at least partially overlaps the first electrode of the storage capacitor and has a concave portion formed where the another lateral end of the connecting wire and the first electrode of the storage capacitor overlap each other.

8 . The display device of claim 1 , wherein each of the pixels further comprises a pixel electrode formed over the connecting wire and at least partially overlapping the connecting wire.

9 . The display device of claim 8 , further comprising:
a first insulating layer at least partially covering the connecting wire; and a second insulating layer formed between the first insulating layer and the pixel electrode.

10 . The display device of claim 1 , wherein the driving TFT includes a gate electrode, and wherein the selected switching TFT includes an initialization TFT configured to supply an initialization voltage to the gate electrode.

11 . The display device of claim 1 , wherein the bottom portions of the connecting wire and the second wire are formed in the same layer.

12 . A method of manufacturing a display device comprising a plurality of switching thin film transistors (TFTs), a driving TFT and a plurality of pixels, the method comprising:
forming a connecting wire configured to electrically connect a selected one of the switching TFTs to the driving TFT, wherein the connecting wire has top and bottom portions opposing each other; forming a first wire extending in a first direction; and forming a second wire extending in a second direction crossing the first direction, wherein the second wire is formed adjacent to the connecting wire and configured to transmit a signal to each of the pixels, wherein the second wire has top and bottom portions opposing each other, and wherein at least the top portions of the connecting wire and the second wire are formed on different layers.

13 . The method of claim 12 , further comprising forming a storage capacitor including a first electrode and a second electrode, and wherein the forming of the connecting wire comprises forming the top portion of the connecting wire on the same layer as at least a portion of one of the first and second electrodes.

14 . The method of claim 13 , wherein the second electrode of the storage capacitor has a concave portion formed where one lateral end of the connecting wire and the first electrode of the storage capacitor overlap each other.

15 . The method of claim 12 , wherein the top portion of the connecting wire is formed below the top portion of the second wire.

16 . The method of claim 12 , wherein the second wire comprises a data line.

17 . The method of claim 12 , further comprising forming a pixel electrode formed over the second wire and at least partially overlapping the connecting wire.

18 . The method of claim 17 , further comprising:
forming a first insulating layer between the connecting wire and the second wire; and forming a second insulating layer over the first insulating layer and below the pixel electrode.

19 . A display device, comprising:
a scan driver configured to provide a scan signal through a scan line extending in a first direction; a data driver configured to provide a data signal through a data line extending in a second direction crossing the first direction, wherein the data line has top and bottom portions opposing each other; and a pixel electrically connected to the scan line and the data line, wherein each pixel comprises:
a switching thin-film transistor (TFT) configured to receive the scan signal and the data signal so as to generate a driving signal;
a driving TFT configured to receive the driving signal so as to generate a driving current;
a connecting wire electrically connecting the driving TFT to the switching TFT, wherein the connecting wire has top and bottom portions opposing each other, and wherein top portions of the connecting wire and the data lines are formed on different layers.

20 . The display device of claim 19 , wherein the height of the data line is greater than that of the connecting wire.

Assignees

• Samsung Display Co Ltd

Inventors

• An Jinsung
• Yoon Juwon
• Lee Jeongsoo
• Lee Jiseon
• Im Choongyoul

Classifications

• G09G2320/0209

  Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title