Fingerprint sensing display apparatus

Patent metadata

Field	Value
Publication number	US-10719681-B2
Application number	US-201816102292-A
Country	US
Kind code	B2
Filing date	Aug 13, 2018
Priority date	Dec 28, 2017
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

Disclosed is a display device. The display device comprising a substrate, a display area including a fingerprint recognition area and a plurality of pixels on the substrate, a support substrate under a rear side of the substrate, a fingerprint sensor, corresponding to the fingerprint recognition area, under the support substrate, and an EMI (electro-magnetic 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 that comprises a fingerprint recognition area, the substrate having a front side and a rear side that is under the front side;
a plurality of pixels on the front side of the substrate;
a support substrate under the rear side of the substrate;
a fingerprint sensor under the support substrate and overlapping with the fingerprint recognition area of the substrate; and
an electro-magnetic interference (EMI) shield member between the support substrate and the fingerprint sensor,
wherein the EMI shield member includes a front surface and a rear surface below the front surface,
wherein the front surface is disposed to face the support substrate and the rear surface is disposed to face the fingerprint sensor.

2. The display device of claim 1 , further comprising:
a cushion member under the rear surface of the EMI shield member, the cushion member at least partially surrounding the fingerprint sensor.

3. The display device of claim 1 , wherein the EMI shield member overlaps the fingerprint recognition area and shields the fingerprint sensor from electromagnetic interference noise.

4. The display device of claim 3 , wherein the EMI shield member further overlaps the display area.

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

6. The display device of claim 1 , wherein the EMI shield member is conductive, and wherein a thickness of the EMI shield member is 300 nm or less.

7. The display device of claim 6 , wherein the EMI shield member includes a conductive ink.

8. A display apparatus comprising:
an electroluminescence display panel including a flexible substrate and a plurality of pixels positioned on the flexible substrate;
a support substrate positioned under the electroluminescence display panel, the support substrate supporting the electroluminescence display panel; and
a shield member under the support substrate, the shield member configured to transmit a frequency of ultrasonic wave for sensing a fingerprint,
wherein the shield member is configured to block light external to the display device or shield the fingerprint sensor from electromagnetic interference.

9. The display apparatus of claim 8 , further comprising:
a fingerprint sensor attached to the shield member, the fingerprint sensor configured to output the frequency of ultrasonic wave to the shield member.

10. The display apparatus of claim 9 , wherein the fingerprint sensor is further configured to sense the frequency of ultrasonic wave reflected by fingerprint of a user.

11. The display apparatus of claim 10 , wherein the shield member includes metallic particles, and the metallic particles are coated on the support substrate.

12. The display apparatus of claim 11 , wherein the shield member includes a copper, and wherein a thickness of the shield member is in a range between 150 nm to 250 nm.

13. The display apparatus of claim 8 , wherein the shield member is electrically grounded.

14. The display apparatus of claim 13 , wherein the electroluminescence display panel further includes a transistor and a distance between the shield member and the transistor is 20 μm or more.

15. The display device of claim 8 , wherein the shield member comprises black polyethylene-terephthalate (PET) or ink that absorbs the light.

16. The display device of claim 9 , further comprising:
an impact mitigating layer under the shield member and surrounding the fingerprint sensor such that a gap is formed between the fingerprint sensor and the impact mitigating layer.

17. The display device of claim 16 , further comprising:
a heat dissipation member disposed on the impact mitigating layer, the heat dissipation member overlapping with the impact mitigating layer and non-overlapping with the gap and the fingerprint sensor.

18. The display device of claim 17 , wherein the heat dissipation member comprises one of metal, graphite, or graphene.

19. The display device of claim 15 , further comprising:
an electro magnetic interference (EMI) shield member under the shield member, the EMI shield member configured to shield the fingerprint sensor from EMI.

20. The display device of claim 19 , wherein the EMI shield member comprises one of a metal plate or conductive ink.

21. A display device comprising:
a plurality of pixels arranged on a substrate;
a transparent support substrate positioned under the substrate;
a cushion member under the transparent support substrate, the cushion member including an opening;
an ultrasonic fingerprint sensor under the support substrate and positioned in the opening of the cushion member; and
a shield member between the cushion member and the support substrate and covering at least a portion of the opening in the cushion member, the shield member configured to shield the ultrasonic fingerprint sensor from at least one of light, heat, or an electromagnetic interference noise,
wherein the shield member includes a front surface and a rear surface below the front surface,
wherein the front surface is disposed to face the support substrate and the rear surface is disposed to face the cushion member.

22. The display device of claim 21 , wherein the shield member is electrically grounded to ground the electromagnetic interference noise.

23. The display device of claim 21 , wherein the cushion member overlaps a rear surface of the ultrasonic fingerprint sensor positioned in the opening, the cushion member absorbing an ultrasonic output from the rear surface of the ultrasonic fingerprint sensor.

24. The display device of claim 21 , further comprising:
a heat dissipation member positioned under the cushion member.

25. The display device of claim 24 , wherein the heat dissipation member overlaps the rear surface of the ultrasonic fingerprint sensor.

26. The display device of claim 24 , wherein the heat dissipation member is made of a conductive material, and the head dissipation member is electrically connected to the shield member.

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• G06V40/1306

  non-optical, e.g. ultrasonic or capacitive sensing · CPC title

• G06F1/1643 Primary

  the display being associated to a digitizer, e.g. laptops that can be used as penpads (details related to the relative motion of the display enclosure with respect to the body enclosure, e.g. to move between laptop and tablet PC configuration G06F1/1615) · CPC title

• H10K59/8794

  Arrangements for heating and cooling · CPC title

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K59/87 Primary

  Passivation; Containers; Encapsulations · CPC title