Pressure sensing element and display device having the same

Patent metadata

Field	Value
Publication number	US-2020174623-A1
Application number	US-201916540909-A
Country	US
Kind code	A1
Filing date	Aug 14, 2019
Priority date	Nov 30, 2018
Publication date	Jun 4, 2020
Grant date	—

Abstract

A display device includes a pressure sensing element. The pressure sensing element senses a pressure input applied thereto from the outside, and the display device is controlled based on the sensed pressure input. The pressure sensing element includes a contact sensing area to sense the pressure input and a defect sensing area to sense a defect. The pressure sensing element measures a resistance value in the defect sensing area and identifies whether at least one of lines of the pressure sensing element is disconnected.

First claim

What is claimed is:

1 . A pressure sensing element comprising:
a first base; a first transmitting electrode disposed on the first base and comprising a first transmitting terminal and a plurality of first transmitting lines electrically connected to the first transmitting terminal; a first receiving electrode disposed on the first base and comprising a first receiving terminal and a plurality of first receiving lines alternately arranged with the plurality of first transmitting lines and electrically connected to the first receiving terminal; a first main pressure sensing layer disposed on the first transmitting electrode and the first receiving electrode and spaced apart from the first transmitting electrode and the first receiving electrode by a first set distance; a first sub-pressure sensing layer disposed on the first transmitting electrode and the first receiving electrode and making contact with the first transmitting electrode and the first receiving electrode without overlapping the first main pressure sensing layer when viewed in a plan view; and a second base disposed on the first main pressure sensing layer and the first sub-pressure sensing layer, making contact with the first main pressure sensing layer, and spaced apart from the first sub-pressure sensing layer by a second set distance.

2 . The pressure sensing element of claim 1 , further comprising a sealing member that couples the first base and the second base.

3 . The pressure sensing element of claim 2 , wherein a first area of the first main pressure sensing layer is greater than a second area of the first sub-pressure sensing layer.

4 . The pressure sensing element of claim 3 , wherein at least one of the first main pressure sensing layer and the first sub-pressure sensing layer comprises a polymer resin and metal particles.

5 . The pressure sensing element of claim 3 , wherein a first number of the plurality of first transmitting lines is equal to a second number of the plurality of first receiving lines.

6 . The pressure sensing element of claim 3 , wherein the first main pressure sensing layer makes contact with at least a portion of the first transmitting electrode and the first receiving electrode when a pressure input is applied from an outside source through the second base.

7 . The pressure sensing element of claim 3 , wherein the first transmitting terminal and the first receiving terminal are disposed adjacent to a first side portion of the first main pressure sensing layer when viewed in the plan view, and the first sub-pressure sensing layer is disposed adjacent to a second side portion of the first main pressure sensing layer when viewed in the plan view.

8 . The pressure sensing element of claim 3 , further comprising a coating layer disposed on the first receiving electrode and the first transmitting electrode, disposed under the first main pressure sensing layer, overlapping at least portions of the plurality of first transmitting lines and the plurality of first receiving lines, wherein the coating layer comprises a hydrophobic material.

9 . The pressure sensing element of claim 8 , wherein the hydrophobic material comprises at least one of fluorine (F) and silicon (Si).

10 . The pressure sensing element of claim 3 , further comprising:
a second transmitting electrode disposed on the first base and comprising a second transmitting terminal and a plurality of second transmitting lines electrically connected to the second transmitting terminal; a second receiving electrode disposed on the first base and comprising a second receiving terminal and a plurality of second receiving lines alternately arranged with the plurality of second transmitting lines and electrically connected to the second receiving terminal; a second main pressure sensing layer disposed on the second transmitting electrode and the second receiving electrode and spaced apart from the second transmitting electrode and the second receiving electrode by the first set distance; and a second sub-pressure sensing layer disposed on the second transmitting electrode and the second receiving electrode and making contact with the second transmitting electrode and the second receiving electrode without overlapping the second main pressure sensing layer.

11 . The pressure sensing element of claim 10 , wherein the second transmitting terminal and the second receiving terminal are disposed adjacent to a third side portion of the second main pressure sensing layer when viewed in the plan view, and the second sub-pressure sensing layer is disposed adjacent to a fourth side portion of the second main pressure sensing layer when viewed in the plan view.

12 . The pressure sensing element of claim 10 , wherein the second main pressure sensing layer makes contact with the second transmitting electrode and the second receiving electrode when a pressure input is applied from an outside source through the second base.

13 . The pressure sensing element of claim 10 , further comprising:
a third transmitting electrode comprising a third transmitting terminal and a plurality of third transmitting lines electrically connected to the third transmitting terminal, disposed on the first base, and disposed between the first transmitting electrode and the second transmitting electrode when viewed in the plan view; a third receiving electrode comprising a third receiving terminal and a plurality of third receiving lines alternately arranged with the plurality of third transmitting lines and electrically connected to the third receiving terminal, disposed on the first base, and disposed between the first receiving electrode and the second receiving electrode when viewed in the plan view; and a third sub-pressure sensing layer disposed on the third transmitting electrode and the third receiving electrode, making contact with the third transmitting electrode and the third receiving electrode, and disposed between the first sub-pressure sensing layer and the second sub-pressure sensing layer when viewed in the plan view.

14 . The pressure sensing element of claim 13 , wherein the second main pressure sensing layer is not disposed between the third transmitting electrode and the second base, and between the third receiving electrode and the second base.

15 . The pressure sensing element of claim 13 , further comprising a plurality of spacers disposed between at least one of adjacent pairs of the plurality of first transmitting lines and the plurality of second transmitting lines and between at least one of adjacent pairs of the plurality of second transmitting lines and the plurality of third transmitting lines.

16 . A display device comprising:
a display panel comprising a plurality of light emitting elements; an input sensing circuit comprising a plurality of sensors disposed on the display panel and capacitively coupled to each other and an input sensing driver electrically connected to plurality of the sensors; a pressure sensing element disposed under the display panel; and a bracket disposed under the pressure sensing element, wherein the pressure sensing element comprises:
a first base;
a transmitting electrode disposed on the first base and comprising a transmitting terminal and a plurality of transmitting lines electrically connected to the transmitting terminal;
a receiving electrode disposed on the first base and comprising a receiving terminal and a plurality of receiving lines alternately arranged with the plurality of transmitting lines and electrically connected to the receiving terminal;
a main pressure sensing layer dis

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Choonhyop
• Lee Kangwon
• Lee Sangchul
• Chung Seunghwan

Classifications

• G06F3/0446 Primary

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• H01L27/3244

  Electricity · mapped topic

• G06F3/0414

  using force sensing means to determine a position · CPC title

• H10K59/65

  OLEDs integrated with inorganic image sensors · CPC title

• G06F3/04144 Primary

  using an array of force sensing means (position sensing using the local deformation of sensor cells G06F3/0447) · CPC title