Fingerprint recognition device, manufacturing method thereof, liquid crystal display

Patent metadata

Field	Value
Publication number	US-10185865-B2
Application number	US-201715544863-A
Country	US
Kind code	B2
Filing date	Jan 10, 2017
Priority date	Jun 15, 2016
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

The present disclosure provides a fingerprint recognition device, a manufacturing method thereof, and a liquid crystal display comprising a fingerprint recognition device. The fingerprint recognition device comprises: a recognition element; a light-reflecting element arranged above the recognition element; and a temperature-sensitive liquid crystal layer arranged between the recognition element and the light-reflecting element. The recognition element comprises a plurality of recognition units, each of which includes a light-emitting sub-unit and a photosensitive sub-unit.

First claim

The invention claimed is:

1. A fingerprint recognition device comprising:
a recognition element;
a light-reflecting element arranged above the recognition element; and
a temperature-sensitive liquid crystal layer arranged between the recognition element and the light-reflecting element,
wherein
the recognition element comprises a plurality of recognition units, each recognition unit comprising a light-emitting sub-unit and a photosensitive sub-unit.

2. The fingerprint recognition device according to claim 1 , wherein a temperature sensitivity of the temperature-sensitive liquid crystal layer is at least 0.1° C.

3. The fingerprint recognition device according to claim 2 , wherein the temperature-sensitive liquid crystal layer includes 4-methoxybenzylidene-4′-butylaniline.

4. The fingerprint recognition device according to claim 1 , further comprising a thermally conductive element arranged above the light-reflecting element.

5. The fingerprint recognition device according to claim 4 , wherein the thermally conductive element is a longitudinal thermally conductive layer.

6. The fingerprint recognition device according to claim 5 , wherein the thermally conductive element has a plurality of parallel strip-shaped units, each of which extends in a longitudinal direction of the liquid crystal layer.

7. The fingerprint recognition device according to claim 4 , further comprising a protection element arranged above the thermally conductive element.

8. The fingerprint recognition device according to claim 1 , wherein the photosensitive sub-unit is made of a semiconductor material having photosensitivity.

9. The fingerprint recognition device according to claim 8 , wherein the semiconductor material is selected from a group comprising a silver salt photosensitive material and a non-silver salt photosensitive material.

10. The fingerprint recognition device according to claim 1 , wherein the light-emitting sub-unit comprises a laser.

11. The fingerprint recognition device according to claim 4 , wherein the thermally conductive element is made of a carbon nanotube composite material.

12. The fingerprint recognition device according to claim 5 , wherein the thermally conductive element is made of a carbon nanotube composite material.

13. The fingerprint recognition device according to claim 7 , wherein the protection element is made of tempered glass.

14. The fingerprint recognition device according to claim 7 , wherein the protection element is made of plexiglass.

15. A method of manufacturing a fingerprint recognition device, comprising:
providing a recognition element comprising a plurality of recognition units, each recognition unit comprising a light-emitting sub-unit and a photosensitive sub-unit;
forming, above the recognition element, a temperature-sensitive liquid crystal layer and a light-reflecting element successively.

16. The method according to claim 15 , wherein the light-reflecting element is formed by making a light-reflecting material layer on a base substrate by vapor deposition or plating process.

17. The method according to claim 16 , wherein the light-reflecting material layer is silver.

18. The method according to claim 16 , further comprising forming a thermally conductive element above the light-reflecting element, the thermally conductive element having a plurality of parallel strip-shaped units by means of laser cutting or chemical etching, wherein each strip-shaped unit extends in a longitudinal direction of the liquid crystal layer.

19. A liquid crystal display, comprising a fingerprint recognition device which is integrated in the liquid crystal display,
wherein
the fingerprint recognition device comprises:
a recognition element;
a light-reflecting element arranged above the recognition element; and
a temperature-sensitive liquid crystal layer arranged between the recognition element and the light-reflecting element,
the recognition element comprises a plurality of recognition units, each recognition unit comprising a light-emitting sub-unit and a photosensitive sub-unit, and
the light-reflecting element is a transflective element.

20. The liquid crystal display according to claim 19 , wherein the temperature-sensitive liquid crystal layer and a liquid crystal layer of the liquid crystal display are formed of a same material in a same layer.

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Wang Mingchao
• Wang Junwei
• Yu Haifeng

Classifications

• G06V40/1318 Primary

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title

• A61B5/1172 Primary

  using fingerprinting · CPC title

• G06V40/1306

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

• G06V40/45

  Detection of the body part being alive · CPC title

• G06K9/0004 Primary

  Physics · mapped topic