Fingerprint sensing display apparatus

Patent metadata

Field	Value
Publication number	US-11080501-B2
Application number	US-201816109278-A
Country	US
Kind code	B2
Filing date	Aug 22, 2018
Priority date	Dec 29, 2017
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

Disclosed is a display device. The display device comprising a substrate, a display area including a fingerprint recognition area on the substrate, a support substrate configured to support the substrate, a fingerprint sensor positioned under a rear side of the support substrate and configured to output ultrasonic to the fingerprint recognition area, and an EMI (electromagnetic interference) shield member positioned between the support substrate and the fingerprint sensor.

First claim

What is claimed is:

1. A display device comprising:
a substrate including a display area and a non-display area, the display area including a fingerprint recognition area for sensing a fingerprint;
a support substrate under the substrate, the support substrate supporting the substrate;
a fingerprint sensor positioned under the support substrate, the fingerprint sensor configured to output an ultrasonic signal to the fingerprint recognition area;
an electromagnetic interference EMI shield member between the support substrate and the fingerprint sensor, the EMI shield member shielding the fingerprint sensor from EMI; and
a cushion member under the support substrate, the cushion member including an opening and the fingerprint sensor disposed in the opening of the cushion member,
wherein the EMI shield member includes a first surface and a second surface below the first surface, and
the first surface is disposed to face the support substrate and the second surface is disposed to face the fingerprint sensor,
wherein the EMI shield member is configured to shield the fingerprint sensor by overlapping with the fingerprint sensor,
wherein the EMI shield member does not entirely cover the cushion member, and
wherein the EMI shield member includes at least one of carbon, graphene, or metal particles, and is configured to have a light-shielding ability.

2. The display device of claim 1 , wherein the EMI shield member is a metal layer having a thickness from 150 nm to 250 nm.

3. The display device of claim 1 , further comprising:
a light-shield member between the support substrate and the EMI shield member, the light-shield member blocking light external to the display device.

4. The display device of claim 3 , wherein the support substrate is at least partially transparent, the light-shield member is at least partially opaque, and the EMI shield member is at least partially reflective.

5. The display device of claim 3 , wherein the light-shield member includes at least one of graphite, carbon, or graphene.

6. The display device of claim 3 , wherein the EMI shield member is electrically connected to the light-shield member and the EMI shield member and the light-shield member are electrically grounded.

7. The display device of claim 1 , wherein the support substrate is opaque and shields the fingerprint sensor from light external to the display device.

8. A display apparatus comprising:
an electroluminescence display panel including a front side and a rear side that is under front side;
a fingerprint sensor under the rear side of the electroluminescence display panel, the fingerprint sensor configured to sense touch;
an electromagnetic interference (EMI) shield member between the electroluminescence display panel and the fingerprint sensor, the EMI shield member configured to shield the fingerprint sensor from electrical signals generated by the electroluminescence display panel and to shield the electroluminescence display panel from electrical signals generated by the fingerprint sensor to improve an image quality of the electroluminescence display panel;
a support substrate between the electroluminescence display panel and the EMI shield member, the support substrate configured to support both the electroluminescence display panel and the EMI shield member; and
a cushion member surrounding the fingerprint sensor such that an opening is formed between the cushion member and the fingerprint sensor, wherein the EMI shield member is configured to cover the fingerprint sensor,
wherein the electroluminescence display panel includes a fingerprint recognition area corresponding to the fingerprint sensor, and the EMI shield member overlaps only the fingerprint recognition area, and
wherein the EMI shield member is included in a transmission and reception channel of the fingerprint sensor.

9. The display apparatus of claim 8 , wherein the EMI shield member is at least partially opaque and further shields the fingerprint sensor from light external to the display apparatus.

10. The display apparatus of claim 8 , wherein the EMI shield member comprises an opaque and conductive material.

11. The display apparatus of claim 8 , wherein the EMI shield member comprises a metal layer configured to shield the display apparatus from an ambient light passing through the electroluminescence display panel.

12. The display apparatus of claim 11 , wherein the EMI shield member is larger than an area of the fingerprint sensor.

13. A display device comprising:
an electroluminescence display panel;
a support substrate under the electroluminescence display panel;
a conductive shield member under the support substrate;
a cushion member under the conductive shield member, the cushion member including an opening;
a fingerprint sensor disposed in the opening of the cushion member; and
a pressure sensor disposed under the fingerprint sensor,
wherein the conductive shield member is disposed between the electroluminescence display panel and the fingerprint sensor, and
wherein the pressure sensor overlaps both at least a portion of the cushion member and at least a portion of the fingerprint sensor in a same direction.

14. The display device of claim 13 , further comprising:
a conductive heat dissipation member under the cushion member, wherein the fingerprint sensor is disposed between the conductive shield member and the conductive heat dissipation member.

15. The display device of claim 14 , wherein the conductive shield member is electrically connected to the conductive heat dissipation member.

16. The display device of claim 13 , wherein the conductive shield member shields the display device from light external to the display device.

17. The display device of claim 13 , further comprising:
a light shield member positioned between the electroluminescence display panel and the conductive shield member, the light shield member shielding the display device from light external to the display device.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Jinyeol
• Gong Namyong
• Choi Sungpil
• Lee Youngsoo

Classifications

• H10K59/8794

  Arrangements for heating and cooling · CPC title

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/65

  OLEDs integrated with inorganic image sensors · CPC title

• H10K59/40 Primary

  OLEDs integrated with touch screens · CPC title