Liquid crystal display apparatus and fingerprint identification method for liquid crystal display apparatus

Patent metadata

Field	Value
Publication number	US-2021191176-A1
Application number	US-202016896429-A
Country	US
Kind code	A1
Filing date	Jun 9, 2020
Priority date	Dec 19, 2019
Publication date	Jun 24, 2021
Grant date	—

Abstract

A liquid crystal display apparatus is disclosed. The liquid crystal display apparatus includes: a liquid crystal display panel; an infrared transmitting reflector plate configured to transmit an infrared light and reflect a visible light; an infrared source configured to emit an infrared light which is to be transmitted through the infrared transmitting reflector plate and the liquid crystal display panel to a fingerprint to be identified on a light exit side of the liquid crystal display panel; and a fingerprint identification module disposed on the side of the infrared transmitting reflector plate facing away from the liquid crystal display panel, and configured to receive a part of the infrared light emitted by the infrared source. The part of the infrared light being reflected by the fingerprint to reach the fingerprint identification module through the liquid crystal display panel and the infrared transmitting reflector plate for performing a fingerprint identification.

First claim

What is claimed is:

1 . A liquid crystal display apparatus comprising:
a liquid crystal display panel configured to display an image; an infrared transmitting reflector plate disposed on a light entry side of the liquid crystal display panel and configured to transmit an infrared light and reflect a visible light; an infrared source disposed on a side of the infrared transmitting reflector plate facing away from the liquid crystal display panel and configured to emit an infrared light which is to be transmitted through the infrared transmitting reflector plate and the liquid crystal display panel to a fingerprint to be identified on a light exit side of the liquid crystal display panel; and a fingerprint identification module disposed on the side of the infrared transmitting reflector plate facing away from the liquid crystal display panel, and configured to receive a part of the infrared light emitted by the infrared source, the part of the infrared light being reflected by the fingerprint to reach the fingerprint identification module through the liquid crystal display panel and the infrared transmitting reflector plate for performing a fingerprint identification.

2 . The liquid crystal display apparatus of claim 1 , further comprising:
an inverse prism sheet disposed between the liquid crystal display panel and the infrared transmitting reflector plate.

3 . The liquid crystal display apparatus of claim 2 , wherein:
the inverse prism sheet comprises: a base sheet; and a plurality of prisms arranged on a surface of the base sheet facing towards the infrared transmitting reflector plate.

4 . The liquid crystal display apparatus of claim 3 , further comprising:
a polarizing sheet bonded to a surface of the base sheet of the inverse prism sheet facing away from the plurality of prisms.

5 . The liquid crystal display apparatus of claim 4 , wherein:
the polarizing sheet is bonded directly to the surface of the base sheet of the inverse prism sheet facing away from the plurality of prisms.

6 . The liquid crystal display apparatus of claim 4 , further comprising:
a light guide plate disposed on a side of the infrared transmitting reflector plate facing towards the liquid crystal display panel, wherein the inverse prism sheet and the polarizing sheet are disposed between the light guide plate and the liquid crystal display panel.

7 . The liquid crystal display apparatus of claim 4 , wherein:
the polarizing sheet comprises a multilayer-film reflective polarizing sheet.

8 . The liquid crystal display apparatus of claim 6 , wherein:
in a thickness direction of the inverse prism sheet, a gap is between the light guide plate and edges of the plurality of prisms of the inverse prism sheet facing away from the base sheet.

9 . The liquid crystal display apparatus of claim 8 , further comprising:
a spacer disposed between the polarizing sheet and the light guide plate and located outside the inverse prism sheet in a direction perpendicular to the thickness direction of the inverse prism sheet, so that in the thickness direction of the inverse prism sheet, the gap is between the light guide plate and the edges of the plurality of prisms of the inverse prism sheet facing away from the base sheet.

10 . The liquid crystal display apparatus of claim 6 , wherein:
the inverse prism sheet is directly adjacent to the light guide plate.

11 . The liquid crystal display apparatus of claim 3 , further comprising:
a light guide plate disposed on a side of the infrared transmitting reflector plate facing towards the liquid crystal display panel, wherein the inverse prism sheet is disposed between the light guide plate and the liquid crystal display panel.

12 . The liquid crystal display apparatus of claim 11 , wherein:
in a thickness direction of the inverse prism sheet, a gap is between the light guide plate and edges of the plurality of prisms of the inverse prism sheet facing away from the base sheet.

13 . The liquid crystal display apparatus of claim 1 , wherein:
the fingerprint identification module comprises: a sensing chip; and a collimating layer disposed on a side of the sensing chip facing towards the infrared transmitting reflector plate and configured to collimate the part of the infrared light which is reflected by the fingerprint to reach the fingerprint identification module through the liquid crystal display panel and the infrared transmitting reflector plate.

14 . The liquid crystal display apparatus of claim 13 , wherein:
the infrared source comprises a plurality of infrared emitting elements disposed around the collimating layer.

15 . The liquid crystal display apparatus of claim 14 , wherein:
the fingerprint identification module further comprises: a support disposed around the sensing chip and the collimating layer, wherein the plurality of infrared emitting elements of the infrared source are disposed on the support.

16 . The liquid crystal display apparatus of claim 13 , wherein:
the collimating layer comprises a lens.

17 . The liquid crystal display apparatus of claim 1 , wherein:
the liquid crystal display panel comprises: two substrates disposed opposite to each other; and a liquid crystal layer disposed between the two substrates.

18 . The liquid crystal display apparatus of claim 6 , further comprising:
a light source disposed on a side of the light guide plate in a direction perpendicular to a thickness direction of the light guide plate, and configured to emit a visible light for displaying an image by the liquid crystal display panel.

19 . A fingerprint identification method for a liquid crystal display apparatus, the liquid crystal display apparatus comprising:
a liquid crystal display panel configured to display an image; an infrared transmitting reflector plate disposed on a light incidence side of the liquid crystal display panel and configured to transmit an infrared light and reflect a visible light; an infrared source disposed on a side of the infrared transmitting reflector plate facing away from the liquid crystal display panel, and configured to emit an infrared light which is to be transmitted through the infrared transmitting reflector plate and the liquid crystal display panel to a fingerprint to be identified on a light exit side of the liquid crystal display panel; and a fingerprint identification module disposed on the side of the infrared transmitting reflector plate facing away from the liquid crystal display panel and configured to receive a part of the infrared light emitted by the infrared source, the part of the infrared light is reflected by the fingerprint to reach the fingerprint identification module through the liquid crystal display panel and the infrared transmitting reflector plate for performing a fingerprint identification, the method comprising: emitting, by the infrared source, an infrared light which is to be transmitted through the infrared transmitting reflector plate and the liquid crystal display panel to a fingerprint to be identified on a light exit side of the liquid crystal display panel; receiving, by the fingerprint identification module, a part of the infrared light emitted by the infrared source, the part of the infrared light being reflected by the fingerprint to reach the fingerprint identification module through the liquid crystal display panel and the infrared transmitting reflector plate; and analyzing, by the fingerprint identification module, the part of the infrared light to identify the fi

Assignees

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

Inventors

• Zhou Jinzhao
• Fan Litao
• Jin Meiling
• Xin Qin
• Zhang Zhiqiang
• Tao Jingfu
• Cheng Pengfei
• Zhang Jian
• Liu Yujie
• Zhang Shubai
• Sun Haiwei
• Zhai Ming
• Hao Yutao
• Cai Site
• Zhao Tingting

Classifications

• G06V40/1324 Primary

  by using geometrical optics, e.g. using prisms (G06V40/1312 takes precedence) · CPC title

• G06V40/1318

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

• G06V10/143

  Sensing or illuminating at different wavelengths · CPC title

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title

• G02F2203/11

  involving infrared radiation · CPC title