Display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10318789-B2
Application number	US-201715475989-A
Country	US
Kind code	B2
Filing date	Mar 31, 2017
Priority date	Jun 10, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A display device includes a display panel, a fingerprint recognition sensor on the display panel, and a cover glass on the fingerprint recognition sensor. The cover glass is defined with at least one groove on a surface that faces the display panel.

First claim

What is claimed is:

1. A display device, comprising:
a display panel;
a fingerprint recognition sensor on the display panel; and
a cover glass on the fingerprint recognition sensor,
wherein:
the cover glass is defined with at least one groove on a surface that faces the display panel; and
the groove has an arch-shaped cross-section having a continuous curvature such that a thickness of the cover glass decreases in a gradual manner from an edge of the groove to a central portion of the groove.

2. The display device of claim 1 , wherein the fingerprint recognition sensor is accommodated in the groove.

3. The display device of claim 1 , wherein the cover glass has a greater residual stress within the groove.

4. The display device of claim 3 , wherein the groove of the cover glass has a residual stress in a range of 1 MPa to 10 MPa.

5. The display device of claim 1 , wherein the cover glass has a minimum thickness at a central portion of the groove, and the minimum thickness is from 5 percent (%) to 95% of a thickness of the cover glass.

6. The display device of claim 5 , wherein the minimum thickness is from 5% to 30% of the thickness of the cover glass.

7. The display device of claim 2 , further comprising an adhesive member between the groove and the fingerprint recognition sensor.

8. The display device of claim 7 , further comprising a high dielectric material between the groove and the adhesive member.

9. The display device of claim 8 , wherein the high dielectric material comprises at least one material selected from the group consisting of low melting glass (LMG), ZnO, Al 2 O 3 , Ta 2 O 5 , TiO 2 , ZrO 2 , La 2 O 3 , and Y 2 O 3 .

10. The display device of claim 8 , wherein the high dielectric material has a thickness in a range of 10 μm to 100 μm.

11. A method of manufacturing a display device, the method comprising:
defining a groove in a cover glass;
accommodating a fingerprint recognition sensor in the groove; and
coupling the cover glass and a display panel,
wherein:
the defining of the groove in the cover glass comprises:
contacting a heat source with a portion of the cover glass to be defined with the groove;
moving the heat source at a predetermined speed to chamfer the cover glass; and
cooling the cover glass rapidly;

the defining of the groove in the cover glass further comprises disposing a high dielectric material in the groove; and
the high dielectric material is LMG comprising material selected from the group consisting of selenium, potassium, arsenic, and sulfur.

12. The method of claim 11 , wherein the cover glass has a greater residual stress within the groove.

13. The method of claim 12 , wherein the groove of the cover glass has a residual stress in a range of 1 Mpa to 10 Mpa.

14. The method of claim 11 , wherein the cover glass has a minimum thickness at a central portion of the groove, and the minimum thickness is in a range from 5% to 95% of a thickness of the cover glass.

15. The method of claim 14 , wherein the minimum thickness is in a range from 5% to 30% of the thickness of the cover glass.

16. The method of claim 11 , wherein the heat source has a temperature in a range from 1200° C. to 1600° C.

17. The method of claim 11 , wherein the heat source contacts the cover glass at a pressure is in a range from 100 kgf to 500 kgf.

18. The method of claim 11 , wherein the groove has an arch-shaped cross-section.

19. The method of claim 11 , wherein the high dielectric material is selected from the group consisting of low melting glass (LMG), ZnO, Al 2 O 3 , Ta 2 O 5 , TiO 2 , ZrO 2 , La 2 O 3 , and Y 2 O 3 .

20. The method of claim 11 , wherein the high dielectric material is disposed in the groove to a thickness in a range of 10 μm to 100 μm.

21. The method of claim 11 , wherein the fingerprint recognition sensor is accommodated in the groove with an adhesive member.

22. The display device of claim 8 , wherein the high dielectric material is LMG comprising material selected from the group consisting of selenium, potassium, arsenic, and sulfur.

23. The display device of claim 1 , wherein the groove has a maximum depth at the central portion of the groove, and the maximum depth is greater than a thickness of the fingerprint recognition sensor.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Jeongwoo
• Kim Mingu
• Cho Woojin
• Kim Seungho
• Baek Jongin
• Shin Heekyun
• Oh Hyunjoon
• Cheon Junhyuk

Classifications

• C03C17/23

  Oxides (C03C17/02 takes precedence) · CPC title

• C03C17/02 Primary

  with glass (C03C17/34, C03C17/44 take precedence) · CPC title

• G06K9/0002

  Physics · mapped topic

• G06K9/00053 Primary

  Physics · mapped topic

• G06V40/1306 Primary

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