Display device with electrostatic dispersion line

Patent metadata

Field	Value
Publication number	US-10453834-B2
Application number	US-201715836090-A
Country	US
Kind code	B2
Filing date	Dec 8, 2017
Priority date	Dec 9, 2016
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A display device includes: a first substrate including display and non-display areas; gate and data lines on the first substrate and crossing each other; an electrostatic dispersion line on the non-display area; an antistatic element including an discharge gate electrode, a discharge semiconductor layer on the discharge gate electrode and overlapping at least a portion of the discharge gate electrode, and a discharge source and drain electrodes a on the discharge semiconductor layer, spaced apart from each other and overlapping at least a portion of the discharge gate electrode; and an electric field protection layer on the antistatic element and overlapping the discharge gate electrode. One of the discharge source and drain electrodes is connected to the electrostatic dispersion line and the other of the discharge source and drain electrodes is connected to one of the gate line and the data line.

First claim

What is claimed is:

1. A display device comprising:
a first substrate comprising a display area and a non-display area;
a gate line extending along a first direction on the first substrate;
a data line extending along a second direction crossing the first direction on the first substrate;
an electrostatic dispersion line on the non-display area of the first substrate;
an antistatic element connected to the electrostatic dispersion line, wherein the antistatic element comprises:
an discharge gate electrode;
a discharge semiconductor layer on the discharge gate electrode, wherein the discharge semiconductor overlaps at least a portion of the discharge gate electrode on the discharge gate electrode;
a discharge source electrode on the discharge semiconductor layer, wherein the discharge source electrode overlaps at least a portion of the discharge gate electrode; and
a discharge drain electrode on the discharge semiconductor layer and spaced apart from the discharge source electrode, wherein the discharge drain electrode overlaps at least a portion of the discharge gate electrode; and

an electric field protection layer on the antistatic element, wherein the electric field protection layer is connected to one of the electrostatic dispersion line, a ground wiring, and a wiring to which a constant electric potential is applied,
wherein
one of the discharge source electrode and the discharge drain electrode is connected to the electrostatic dispersion line,
the other of the discharge source electrode and the discharge drain electrode is connected to one of the gate line and the data line, and
the electric field protection layer has substantially the same electric potential as the one of the electrostatic dispersion line, the ground potential, and the wiring.

2. The display device as claimed in claim 1 , wherein
the electric field protection layer has a planar area larger than a planar area of the discharge gate electrode, and
the electric field protection layer covers the discharge gate electrode.

3. The display device as claimed in claim 2 , wherein the electric field protection layer comprises a conductive material.

4. The display device as claimed in claim 2 , wherein the electrostatic dispersion line extends along the first direction or the second direction.

5. The display device as claimed in claim 4 , wherein the electrostatic dispersion line has a closed loop shape surrounding the display area.

6. The display device as claimed in claim 1 , wherein the discharge gate electrode has a width less than a width of the discharge source electrode and the discharge drain electrode.

7. The display device as claimed in claim 6 , wherein an entire portion of the discharge gate electrode overlaps at least one of the discharge semiconductor layer, the discharge source electrode and the discharge drain electrode on a plane.

8. The display device as claimed in claim 6 , wherein an overlapping area of the discharge gate electrode and the discharge source electrode and an overlapping area of the discharge gate electrode and the discharge drain electrode have different planar areas from each other.

9. The display device as claimed in claim 8 , further comprising:
a first capacitor defined by the overlapping area of the discharge gate electrode and the discharge source electrode; and
a second capacitor defined by the overlapping area of the discharge gate electrode and the discharge drain electrode,
wherein the first capacitor has a capacitance value different from a capacitance value of the second capacitor.

10. The display device as claimed in claim 6 , wherein the discharge source electrode and the discharge drain electrode comprise a substantially same conductive material.

11. A display device comprising:
a first substrate comprising a display area and a non-display area;
a gate line extending along a first direction on the first substrate;
a data line extending along a second direction crossing the first direction on the first substrate;
an electrostatic dispersion line on the non-display area of the first substrate; and
an antistatic element connected to the electrostatic dispersion line, wherein the antistatic element comprises:
an discharge gate electrode;
a discharge semiconductor layer on the discharge gate electrode, wherein the discharge semiconductor layer overlaps at least a portion of the discharge gate electrode on the discharge gate electrode;
a discharge source electrode on the discharge semiconductor layer wherein the discharge source electrode overlaps at least a portion of the discharge gate electrode; and
a discharge drain electrode on the discharge semiconductor layer and spaced apart from the discharge source electrode, wherein the discharge drain electrode overlaps at least a portion of the discharge gate electrode,

wherein
one of the discharge source electrode and the discharge drain electrode is connected to the electrostatic dispersion line,
the other of the discharge source electrode and the discharge drain electrode is connected to one of the gate line and the data line, and
the discharge gate electrode has a width less than a width of the discharge source electrode and the discharge drain electrode when viewed from a plan view in a width direction of the discharging semiconductor layer.

12. The display device as claimed in claim 11 , wherein an entire portion of the discharge gate electrode overlaps at least one of the discharge semiconductor layer, the discharge source electrode and the discharge drain electrode on a plane.

13. The display device as claimed in claim 11 , wherein the discharge source electrode and the discharge drain electrode comprise a substantially same conductive material.

14. The display device as claimed in claim 11 , wherein an overlapping area of the discharge gate electrode and the discharge source electrode and an overlapping area of the discharge gate electrode and the discharge drain electrode have different planar areas from each other.

15. The display device as claimed in claim 14 , further comprising:
a first capacitor defined by the overlapping area of the discharge gate electrode and the discharge source electrode; and
a second capacitor defined by the overlapping area of the discharge gate electrode and the discharge drain electrode,
wherein the first capacitor has a capacitance value different from a capacitance value of the second capacitor.

16. The display device as claimed in claim 11 , wherein the electrostatic dispersion line extends along the first direction or the second direction.

17. The display device as claimed in claim 16 , wherein the electrostatic dispersion line has a closed loop shape surrounding the display area.

18. The display device as claimed in claim 16 , wherein
the antistatic element is provided in plural,
one of the discharge source electrode and the discharge drain electrode of one of the antistatic elements is connected to the electrostatic dispersion line,
the other of the discharge source electrode and the discharge drain electrode of the one of the antistatic elements is connected to the gate line, and
one of the discharge source electrode and the discharge drain electrode of another of the antistatic elements is connected to the electrostatic dispersion line, and
the other of the discharge source electrode and the discharge drain electrode of the another of the antistatic elements is connected to the data line.

19. The display device as claimed in claim 16 , wherein the electrostatic dispersion line ha

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Changsoo
• Choi Kookhyun

Classifications

• G02F2202/22

  Antistatic materials or arrangements · CPC title

• G02F1/136204

  Arrangements to prevent high voltage or static electricity failures · CPC title

• G09G2330/06

  Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title