Electronic paper and display device

Patent metadata

Field	Value
Publication number	US-12044944-B2
Application number	US-202117376213-A
Country	US
Kind code	B2
Filing date	Jul 15, 2021
Priority date	Dec 10, 2020
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

Electronic paper includes a display panel and a drive component. The display panel may include a plurality of pixels disposed in a display region and a photoelectric conversion transistor disposed in a non-display region. The drive component is electrically connected to the plurality of pixels, and is electrically connected to a current output terminal of the photoelectric conversion transistor.

First claim

What is claimed is:

1. Electronic paper, comprising: a display panel and a drive component, wherein
the display panel has a display region and a non-display region surrounding the display region, and the display panel comprises a plurality of pixels disposed in the display region and a photoelectric conversion transistor disposed in the non-display region, the photoelectric conversion transistor comprising a current output terminal;
the drive component is electrically connected to the plurality of pixels, and is electrically connected to the current output terminal of the photoelectric conversion transistor; and
the photoelectric conversion transistor comprises: an active layer, a first electrode and a second electrode that are overlapped with the active layer, and a gate insulated from the active layer,
wherein one of the first electrode and the second electrode is electrically connected to the current output terminal, and the active layer comprises a first portion that is in contact with the first electrode, a second portion that is in contact with the second electrode, and a channel portion disposed between the first portion and the second portion, wherein the channel portion comprises at least one strip-shaped sub-channel, and a total length of the at least one strip-shaped sub-channel is greater than a distance between the first electrode and the second electrode.

2. The electronic paper according to claim 1 , wherein the at least one strip-shaped sub-channel is extended along a non-linear direction.

3. The electronic paper according to claim 2 , wherein the at least one strip-shaped sub-channel is extended along an extension direction of a fold line.

4. The electronic paper according to claim 3 , wherein
the first electrode comprises: a strip-shaped first sub-electrode and a plurality of strip-shaped second sub-electrodes, wherein one end of each of the plurality of second sub-electrodes is connected to the first sub-electrode; and
the second electrode comprises: a strip-shaped third sub-electrode and a plurality of strip-shaped fourth sub-electrodes, wherein one end of each of the plurality of fourth sub-electrodes is connected to the third sub-electrode,
wherein the first sub-electrode, the second sub-electrodes, the third sub-electrode, and the fourth sub-electrodes are all overlapped with the active layer, the plurality of second sub-electrodes and the plurality of fourth sub-electrodes are all disposed between the first sub-electrode and the third sub-electrode, and the plurality of second sub-electrodes and the plurality of fourth sub-electrode are alternately distributed.

5. The electronic paper according to claim 4 , wherein a length direction of the first sub-electrode is parallel to a length direction of the third sub-electrode, length directions of the plurality of second sub-electrodes are parallel to length directions of the plurality of fourth sub-electrodes, and the length direction of the first sub-electrode is perpendicular to the length direction of the second sub-electrode.

6. The electronic paper according to claim 1 , wherein the channel portion comprises a plurality of strip-shaped sub-channels extending in parallel.

7. The electronic paper according to claim 6 , wherein
the first electrode comprises: a strip-shaped first sub-electrode and a plurality of strip-shaped second sub-electrodes, wherein one end of each of the plurality of second sub-electrodes is connected to the first sub-electrode; and
the second electrode comprises: a strip-shaped third sub-electrode and a plurality of strip-shaped fourth sub-electrodes, wherein one end of each of the plurality of fourth sub-electrodes is connected to the third sub-electrode,
wherein the second sub-electrodes and the fourth sub-electrodes are all overlapped with the active layer, the first sub-electrode and the third sub-electrode are not overlapped with the active layer, the plurality of second sub-electrodes and the plurality of fourth sub-electrodes are all disposed between the first sub-electrode and the third sub-electrode, and the plurality of second sub-electrodes and the plurality of fourth sub-electrode are alternately distributed.

8. The electronic paper according to claim 1 , wherein the active layer in the photoelectric conversion transistor comprises: a plurality of sub- active layers disposed at intervals, and the gate in the photoelectric conversion transistor comprises: a plurality of sub-gates that are in one-to-one correspondence with the plurality of sub-active layers, wherein the plurality of sub-gates are electrically connected in sequence.

9. The electronic paper according to claim 1 , wherein the pixel comprises a thin-film transistor, and a pixel electrode electrically connected to the thin-film transistor, wherein the thin-film transistor and the photoelectric conversion transistor are disposed in a same layer.

10. The electronic paper according to claim 1 , wherein the other one of the first electrode and the second electrode is in one of a suspended state and a grounded state.

11. The electronic paper according to claim 1 , wherein the photoelectric conversion transistor is disposed on at least one side of the display region.

12. The electronic paper according to claim 11 , wherein the non-display region comprises: a bonding region on one side of the display region, and at least two transistor regions on other sides of the display region, and the photoelectric conversion transistor is disposed in at least one of the transistor regions.

13. The electronic paper according to claim 12 , wherein one photoelectric conversion transistor is disposed in each of transistor regions, and the photoelectric conversion transistors in the transistor regions are connected in series.

14. The electronic paper according to claim 13 , further comprising: a flexible printed circuit, wherein at least a portion of the flexible printed circuit is disposed in the bonding region, and the flexible printed circuit is configured to be connected to the pixels and the drive component.

15. The electronic paper according to claim 1 , wherein the display panel comprises: two substrates facing each other, and an electrophoretic layer disposed between the two substrates, wherein the plurality of pixels and the photoelectric conversion transistor are disposed in one of the two substrates.

16. The electronic paper according to claim 15 , wherein the one of the two substrates comprises: a first base, and the photoelectric conversion transistor, a thin-film transistor, and a pixel electrode electrically connected to the thin-film transistor, which are disposed on the first base; and
the other of the two substrates comprises: a second base, and a common electrode on the second base.

17. The electronic paper according to claim 16 , wherein the electrophoretic layer comprises: a plurality of electrophoretic capsules, wherein the electrophoretic capsule comprises: a capsule body, and electrophoretic fluid and charged particles in the capsule body.

18. A display device, comprising: electronic paper, and a housing connected to the electronic paper, wherein
the electronic paper comprises: a display panel and a drive component, wherein
the display panel has a display region and a non-display region surrounding the display region, and the display panel comprises a plurality of pixels disposed in the display region and a photoelectric conversion transistor disposed in the non-display region, the photoelectric conversion transistor comprising a current output terminal;
the drive component is electrically

Assignees

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

Inventors

• Su Shaokai
• Deng Liguang
• Hua Gang
• Wang Min
• Wang Zhe
• Wang Dong
• Li Shaobo
• Gong meng
• Fan Pengkai
• Hu Jintang
• Pan Liangliang
• Liu Jinghao

Classifications

• G02F1/1677

  Structural association of cells with optical devices, e.g. reflectors or illuminating devices · CPC title

• G02F1/16757

  Microcapsules · CPC title

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title

• G02F1/16766

  for active matrices · CPC title