Display apparatus with fingerprint identification device

Patent metadata

Field	Value
Publication number	US-10685206-B2
Application number	US-201816118183-A
Country	US
Kind code	B2
Filing date	Aug 30, 2018
Priority date	Jan 30, 2018
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

A display apparatus includes a display panel including a first sub-pixel and a second sub-pixel adjacent to the first sub-pixel; a first fingerprint identification device including a first photosensitive element, an orthographic projection of the first photosensitive element on the display panel being located within the first sub-pixel; and a fingerprint identification anti-interference structure on a light exiting side of the display panel. The fingerprint identification anti-interference structure is configured to shield the first photosensitive element from light emitted from the second sub-pixel and reflected by a fingerprint.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel comprising a first sub-pixel and a second sub-pixel adjacent to the first sub-pixel;
a first fingerprint identification device comprising a first photosensitive element, an orthographic projection of the first photosensitive element on the display panel being located within the first sub-pixel; and
a fingerprint identification anti-interference structure on a light exiting side of the display panel,
wherein the fingerprint identification anti-interference structure is configured to shield the first photosensitive element from light emitted from the second sub-pixel and reflected by a fingerprint.

2. The display apparatus of claim 1 , wherein the fingerprint identification anti-interference structure comprises a guest-host effect cell and a polarizer on a side of the guest-host effect cell facing away from the display panel, and
wherein the guest-host effect cell comprises:
a first substrate and a second substrate opposite to each other;
liquid crystal molecules between the first substrate and the second substrate;
dye molecules between the first substrate and the second substrate;
a plurality of first electrodes on the first substrate, the plurality of first electrodes being insulated from each other; and
at least one second electrode on the second substrate.

3. The display apparatus of claim 2 , wherein the dye molecules are dichroic dye molecules.

4. The display apparatus of claim 2 , wherein the guest-host effect cell further comprises: a first alignment layer on a side of the first substrate facing towards the second substrate; and a second alignment layer on a side of the second substrate facing towards the first substrate; and
wherein alignment directions of both the first alignment layer and the second alignment layer are perpendicular to an absorption axis of the polarizer.

5. The display apparatus of claim 1 , wherein the fingerprint identification anti-interference structure comprises a first photonic crystal structure, the first photonic crystal structure having a periodic structure in which photonic band gaps are generated in both a first direction and a second direction.

6. The display apparatus of claim 5 , wherein the first photonic crystal structure comprises:
a substrate formed of a first medium; and
a plurality of holes in the substrate, the plurality of holes being spaced apart and evenly distributed in the substrate in both the first direction and the second direction, the plurality of holes being filled with a second medium different from the first medium.

7. The display apparatus of claim 5 , wherein the first photonic crystal structure comprises:
a substrate formed of a first medium; and
a plurality of pillars on the substrate, the plurality of pillars being spaced apart and evenly distributed on the substrate in both the first direction and the second direction, the plurality of pillars being formed of the first medium.

8. The display apparatus of claim 1 , wherein the fingerprint identification anti-interference structure comprises a second photonic crystal structure, the second photonic crystal structure having a structure that allows light within a predetermined frequency range to be transmitted in a third direction.

9. The display apparatus of claim 8 , wherein the second photonic crystal structure comprises a first photonic crystal unit for allowing light of a first color to be transmitted through the first photonic crystal unit, a second photonic crystal unit for allowing light of a second color to be transmitted through the second photonic crystal unit, and a third photonic crystal unit for allowing light of a third color to be transmitted through the third photonic crystal unit.

10. The display apparatus of claim 9 , wherein each of the first photonic crystal unit, the second photonic crystal unit and the third photonic crystal unit comprises:
a first portion having a first material layer and a second material layer alternately arranged in the third direction, the first material layer and the second material layer having different refractive indices;
a second portion having a first material layer and a second material layer alternately arranged in the third direction; and
a defective layer between the first portion and the second portion.

11. The display apparatus of claim 10 , wherein thicknesses of the defective layer of the first photonic crystal unit, the defective layer of the second photonic crystal unit and the defective layer of the third photonic crystal unit are different from each other; or
refractive indices of the defective layer of the first photonic crystal unit, the defective layer of the second photonic crystal unit and the defective layer of the third photonic crystal unit are different from each other.

12. The display apparatus of claim 9 , wherein the display panel further comprises a third sub-pixel adjacent to the first sub-pixel, the first sub-pixel emitting light of the first color, the second sub-pixel emitting light of the second color, and the third sub-pixel emitting light of the third color, and
wherein an orthographic projection of the first photonic crystal unit on the display panel at least partially coincides with the first sub-pixel, an orthographic projection of the second photonic crystal unit on the display panel at least partially coincides with the second sub-pixel, and an orthographic projection of the third photonic crystal unit on the display panel at least partially coincides with the third sub-pixel.

13. The display apparatus of claim 1 , wherein the first photosensitive element is configured to sense visible light, and the orthographic projection of the first photosensitive element on the display panel does not coincide with a light emitting region of the first sub-pixel.

14. The display apparatus of claim 1 , wherein the first photosensitive element is configured to sense non-visible light, and the orthographic projection of the first photosensitive element on the display panel at least partially coincides with a light emitting region of the first sub-pixel.

15. The display apparatus of claim 5 , wherein the first photosensitive element is configured to sense non-visible light, and the orthographic projection of the first photosensitive element on the display panel at least partially coincides with a light emitting region of the first sub-pixel on the display panel.

16. The display apparatus of claim 12 further comprising:
a second fingerprint identification device comprising a second photosensitive element, an orthographic projection of the second photosensitive element on the display panel being located within the second sub-pixel; and
a third fingerprint identification device comprising a third photosensitive element, an orthographic projection of the third photosensitive element on the display panel being located within the third sub-pixel,
wherein the first photosensitive element is configured to sense light of the first color, the second photosensitive element is configured to sense light of the second color, and the third photosensitive element is configured to sense light of the third color.

17. The display apparatus of claim 1 , wherein the first photosensitive element comprises a photodiode, and the fingerprint identification device further comprises a thin film transistor configured to read a signal generated by the photodiode.

18. The display apparatus of claim 1 , wherein the first fingerprint identification device is located on the display panel or on the fingerprint id

Assignees

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

Inventors

• Hu Weipin
• Bu Qianqian
• Qiu Yun
• Sun Xiao
• Wei Congcong
• Jiang Mingxiao
• Wang Chun
• Zhang Hui
• You Yang
• Liu Sha
• Yang Ruizhi
• Qu Lianjie

Classifications

• G06V40/1318 Primary

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

• H10K59/60

  OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes · CPC title

• G02B1/005

  made of photonic crystals or photonic band gap materials (photonic band-gap structures or photonic lattices in integrated optics G02B6/1225; photonic band-gap structures or photonic lattices in optical fibres G02B6/02295) · CPC title

• G02F1/1333 Primary

  Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) · CPC title

• G02F1/133528

  Polarisers · CPC title