Optical fingerprint recognition apparatus and display panel

• US 10,664,680 B2
• Filed: 09/18/2017
• Issued: 05/26/2020
• Est. Priority Date: 02/23/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Xu, Rui, Dong, Xue, Wang, Haisheng, Wu, Chun-Wei, Liu, Yingming, Li, Changfeng, Qin, Yunke, Ding, Xiaoliang, Gu, Pinchao, Zhao, Lijun, Jia, Yanan, Guo, Yuzhen, Lv, Jing, Chen, Xiaochuan
• Primary Examiner(s): Entezari, Michelle M
• Application Number:
  US15/759,755
• Publication Number:
  US 20190050621A1
• Time in Patent Office: 981 Days
• Field of Search: None
• CPC Class Codes: G02B 27/30 Collimators
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G06V 40/1341 Sensing with light passing through the finger

Abstract

The embodiments of the present disclosure provide an optical fingerprint recognition apparatus and a display panel. The apparatus comprises: a light emitting structure (1), a collimating structure (2) and a plurality of photosensitive sensors (3); the light emitting structure (1) is used for generating detecting light; the collimating structure (2) is used for filtering the detecting light reflected by a finger, such that light with a scattering angle in a predetermined range transmits through the collimating structure (2); the photosensitive sensors (3) are used for receiving the light transmitted through the collimating structure (2) and acquiring fingerprint information according to the received light. The embodiments of the present disclosure are used for manufacturing a display panel. The present disclosure can enhance accuracy of the recognized fingerprint information during an optical fingerprint recognition process.

Claims

1. An optical fingerprint recognition apparatus, comprising:

a light emitting structure, a collimating structure and a plurality of photosensitive sensors, wherein;

the light emitting structure is used for generating detecting light;

the collimating structure is used for filtering the detecting light reflected by a finger, such that light with a scattering angle in a predetermined range transmits through the collimating structure; and

the photosensitive sensors are used for receiving the light transmitted through the collimating structure and acquiring fingerprint information according to the received light,

wherein the light emitting structure comprises;

a driving back plate, an insulation layer arranged on the driving back plate, an anode electrode layer and an isolation layer arranged on the insulation layer, an organic light emitting layer arranged on the anode electrode layer, a cathode electrode arranged on the organic light emitting layer and the isolation layer, an encapsulation layer arranged on the cathode electrode and a cover layer covering the encapsulation layer; and

wherein the collimating structure comprises;

a plurality of focusing lenses arranged between the cover layer and the encapsulation layer, a first collimator and a second collimator;

the first collimator comprises a plurality of through-holes arranged on a source drain metal layer of the driving back plate;

the plurality of through-holes are respectively located on a primary optical axis of one of the focusing lenses;

the second collimator comprises a light-shielding material arranged on the back of the driving back plate;

the light-shielding material is provided with a plurality of openings;

the plurality of openings are respectively located on a primary optical axis of one of the focusing lenses.

2. The optical fingerprint recognition apparatus according to claim 1, wherein at least one of the photosensitive sensors comprises a sensing electrode, a diode and a triode;

the sensing electrode is connected to an anode of the diode and is used for receiving the light transmitted through the collimating structure and converting the light transmitted through the collimating structure into current; and

the a cathode electrode of the diode is connected to a first electrode of the triode;

a second electrode of the triode is connected to a current detecting end, and a gate of the triode is connected to a control signal end.

3. The optical fingerprint recognition apparatus according to claim 1, wherein at least one of the isolation layer or the insulation layer is made of a light-shielding material;

or at least one of the isolation layer or the insulation layer is made of a translucent material;

the collimating structure comprises a plurality of through-holes penetrating the isolation layer and the insulation layer.

4. The optical fingerprint recognition apparatus according to claim 1, wherein the collimating structure comprises a collimating layer arranged on the back of the driving back plate;

the collimating layer is made of a light-shielding material or a translucent material; and

the collimating layer has a plurality of through-holes arranged thereon.

5. The optical fingerprint recognition apparatus according to claim 4, wherein an aperture of each of the through-holes is greater than or equal to 0.1 micron and smaller than or equal to 10 microns.

6. The optical fingerprint recognition apparatus according to claim 4, wherein a ratio between an aperture of each of the through-holes and a depth of each of the through-holes is greater than or equal to 1:

50 and smaller than or equal to 1;

5.

7. The optical fingerprint recognition apparatus according to claim 1, wherein the collimating structure comprises a first collimator and a second collimator;

the first collimator comprises a plurality of first through-holes arranged on a source drain metal layer of the driving back plate;

the second collimator comprises;

a substrate arranged on the back of the driving back plate, a light-shielding material layer arranged on a face of the substrate opposite to the driving back plate, and a plurality of second through-holes penetrating the substrate and the light-shielding material layer;

wherein openings of the first through-holes and openings of the second through-holes are in alignment with each other.

8. The optical fingerprint recognition apparatus according to claim 7, wherein the first through-holes and the second through-holes are round through-holes, or the first through-holes and the second through-holes are square through-holes.

9. The optical fingerprint recognition apparatus according to claim 7, wherein an aperture of each of the second through-holes is greater than or equal to 0.1 micron and smaller than or equal to 2 microns.

10. The optical fingerprint recognition apparatus according to claim 1, wherein the collimating structure comprises:

a substrate arranged on the back of the driving back plate, a first light-shielding material layer arranged on an upper surface of the substrate, a second light-shielding material layer arranged on a lower surface of the substrate, and a through-hole penetrating the first light-shielding material layer, the substrate and the second light-shielding material layer.

11. The optical fingerprint recognition apparatus according to claim 10, wherein a light-absorbing material layer is arranged on a wall of the through-hole.

12. The optical fingerprint recognition apparatus according to claim 1, wherein the collimating structure comprises:

a first privacy film arranged on the back of the driving back plate and a plurality of first privacy prisms arranged between the first privacy film and the driving back plate.

13. The optical fingerprint recognition apparatus according to claim 12, wherein the collimating structure further comprises:

a second privacy film arranged on the cover layer and a plurality of second privacy prisms arranged on the second privacy film;

the gaps among the plurality of first privacy prisms and gaps among the plurality of second privacy prisms are in alignment with each other.

14. The optical fingerprint recognition apparatus according to claim 1, wherein each of the focusing lenses has a radius greater than or equal to 6 microns.

15. The optical fingerprint recognition apparatus according to claim 1, wherein each of the openings has a diameter of 4 microns.

16. A display panel, comprising an optical fingerprint recognition apparatus according to claim 1.