Pattern recognition device, array substrate and display apparatus

Patent metadata

Field	Value
Publication number	US-2020175243-A1
Application number	US-201816326478-A
Country	US
Kind code	A1
Filing date	May 11, 2018
Priority date	Aug 9, 2017
Publication date	Jun 4, 2020
Grant date	—

Abstract

Disclosed are a pattern recognition device, an array substrate and a display apparatus. The pattern recognition device includes: a base substrate; and a plurality of pattern recognizers on the base substrate, at least one of the plurality of pattern recognizers including a photosensitive structure and an optical path selector. The photosensitive structure includes a first light-shielding electrode, a photoelectric conversion and a second light-shielding electrode which are arranged in a stacked manner, the first light-shielding electrode including a light-transmitting region; and the optical path selector is configured to direct pattern light rays having a predetermined angle with respect to a surface of the pattern recognition device to the light-transmitting region.

First claim

1 . A pattern recognition device comprising:
a base substrate; and a plurality of pattern recognizers on the base substrate, at least one of the plurality of pattern recognizers comprising a photosensitive structure and an optical path selector, wherein the photosensitive structure comprises a first light-shielding electrode, a photoelectric conversion layer and a second light-shielding electrode which are arranged in a stacked manner, the first light-shielding electrode comprising a light-transmitting region; and the optical path selector is configured to direct pattern light rays having a predetermined angle with respect to a surface of the pattern recognition device to the light-transmitting region.

2 . The pattern recognition device of claim 1 , wherein the optical path selector comprises:
a first inclined reflective face; and a second inclined reflective face opposite to the first inclined reflective face.

3 . The pattern recognition device of claim 2 , wherein
a distance between the first inclined reflective face and the second inclined reflective face is gradually increased in a direction from the base substrate to the photosensitive structure; and the first light-shielding electrode, the photoelectric conversion layer and the second light-shielding electrode are sequentially stacked in the direction from the base substrate to the photosensitive structure.

4 . The pattern recognition device of claim 3 , wherein the optical path selector further comprises: a first light absorbing face which connects the first inclined reflective face with the second inclined reflective face at a side of the optical path selector close to the base substrate.

5 . The pattern recognition device of claim 3 , wherein the optical path selector further comprises: a second light absorbing surface on a side of the first light-shielding electrode facing towards the base substrate.

6 . The pattern recognition device of claim 3 , wherein the at least one of the plurality of pattern recognizers further comprises: a switching transistor connected to the photosensitive structure, the switching transistor being disposed between the base substrate and the optical path selector.

7 . The pattern recognition device of claim 2 , wherein
the first inclined reflective face and the second inclined reflective face are parallel to each other; and the second light-shielding electrode, the photoelectric conversion layer and the first light-shielding electrode are sequentially stacked in a direction from the base substrate to the photosensitive structure.

8 . The pattern recognition device of claim 7 , wherein the optical path selector further comprises: a third light absorbing face on a side of the first light-shielding electrode facing away from the base substrate.

9 . The pattern recognition device of claim 7 , wherein the optical path selector further comprises: a fourth light absorbing face at an end of the first inclined reflective face or the second inclined reflective face away from the base substrate.

10 . The pattern recognition device of claim 7 , wherein the at least one of the plurality of pattern recognizers further comprises: a switching transistor connected to the photosensitive structure, the switching transistor being disposed between the base substrate and the photosensitive structure.

11 . The pattern recognition device of claim 2 , wherein an included angle between the first inclined reflective face and the base substrate is equal to an included angle between the second inclined reflective face and the base substrate; and
the optical path selector is configured to reflect the pattern light rays having the predetermined angle with respect to the surface of the pattern recognition device to the light-transmitting region, the predetermined angle being substantially double of the included angle between the first inclined reflective face and the base substrate or the included angle between the second inclined reflective face and the base substrate.

12 . The pattern recognition device of claim 11 , wherein each of the included angle between the first inclined reflective face and the base substrate and the included angle between the second inclined reflective face and the base substrate is equal to 45 degrees; and
an orthographic projection of the light-transmitting region of the first light-shielding electrode on the base substrate and an orthographic projection of the second inclined reflective face on the base substrate at least partially coincide with each other.

13 . The pattern recognition device of claim 11 , wherein each of the included angle between the first inclined reflective face and the base substrate and the included angle between the second inclined reflective face and the base substrate is larger than or less than 45 degrees, and an orthographic projection of the light-transmitting region of the first light-shielding electrode on the base substrate is offset towards the first inclined reflective face with respect to an orthographic projection of the second inclined reflective face on the base substrate; or
wherein each of the included angle between the first inclined reflective face and the base substrate and the included angle between the second inclined reflective face and the base substrate is less than 45 degrees, and an orthographic projection of the light-transmitting region of the first light-shielding electrode on the base substrate is offset away from the first inclined reflective face with respect to an orthographic projection of the second inclined reflective face on the base substrate.

14 . The pattern recognition device of claim 6 , wherein the first light-shielding electrode is electrically connected to a drain electrode of the switching transistor, and the second light-shielding electrode is electrically connected to an electrode line which applies a constant electrical potential; or
wherein the first light-shielding electrode is electrically connected to an electrode line which applies a constant electrical potential, and the second light-shielding electrode is electrically connected to a drain electrode of the switching transistor.

15 . The pattern recognition device of claim 14 , wherein the electrode line which applies the constant electrical potential is disposed in the same layer as the drain electrode of the switching transistor.

16 . The pattern recognition device of claim 2 , wherein the optical path selector is disposed between the base substrate and the photosensitive structure, or the optical path selector is disposed on a side of the photosensitive structure facing away from the base substrate.

17 . (canceled)

18 . An array substrate comprising:
a plurality of display units in a display area; and the pattern recognition device of claim 1 in the display area.

19 . The array substrate of claim 18 , wherein the display unit comprises a light emitting structure and a driving circuit comprising a driving transistor; an anode of the light emitting structure being electrically connected to the driving circuit, and the anode being a reflective electrode; and
the switching transistor of the pattern recognition device is disposed in the same layer as the driving transistor, and the first light-shielding electrode or the second light-shielding electrode of the pattern recognition device is disposed in the same layer as the anode.

20 . A display apparatus comprising the array substrate of claim 18 .

21 . The pattern recognition device of claim 10

Assignees

• Boe Technology Group Co Ltd

Inventors

• Liu Yingming
• Wang Haisheng
• Dong Xue
• Ding Xiaoliang
• Xu Rui
• Li Changfeng
• Gu Pinchao

Classifications

• G06K9/0004 Primary

  Physics · mapped topic

• G06V40/1318 Primary

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