Display panel, method of manufacturing display panel, fingerprint identification device, and method of identifying fingerprint

Patent metadata

Field	Value
Publication number	US-10658407-B2
Application number	US-201816030981-A
Country	US
Kind code	B2
Filing date	Jul 10, 2018
Priority date	Jan 2, 2018
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

Embodiments of the present disclosure provide a display panel, a method of manufacturing the display panel, a fingerprint identification device, and a method of identifying a fingerprint. The display panel includes first and second substrates. The first substrate is formed with switch transistors arranged in an array, and photosensitive elements arranged in an array and connected with the switch transistors. The second substrate is formed with conductive contact members, the contact members each have an end adjacent to the first substrate, and the end of each of the contact members is spaced from the first substrate so that when the second substrate is deformed by a force, the end of at least one of the contact members electrically contacts the first substrate so that at least one of the switch transistors in a position corresponding to the at least one of the contact members is turned on.

First claim

What is claimed is:

1. A display panel comprising:
a first substrate and a second substrate disposed opposite to each other,
wherein the first substrate is formed with: a plurality of switch transistors arranged in an array, and a plurality of photosensitive elements arranged in an array and respectively connected with the plurality of switch transistors; and
wherein the second substrate is formed with a plurality of conductive contact members, the plurality of contact members each have an end adjacent to the first substrate, and the end of each of the contact members is spaced from the first substrate by a preset distance so that when the second substrate is deformed by a force, the end of at least one of the contact members electrically contacts the first substrate so that at least one of the switch transistors in a position corresponding to the at least one of the contact members is turned on.

2. The display panel of claim 1 , wherein:
the switch transistors each have a control electrode configured to control a turn-on of the switch transistor, a first electrode and a second electrode, the second electrode is connected with one of the photosensitive elements to input an induced current generated by the one of the photosensitive elements when the one of the photosensitive elements is irradiated by a light, and the first electrode is configured to output the induced current when the switch transistor is turned on.

3. The display panel of claim 2 , wherein:
the first substrate is further formed with scan lines and data lines;
the first electrodes of the switch transistors are connected with the data lines, respectively; and
the contact members are electrically connected with the scan lines of the first substrate, respectively.

4. The display panel of claim 2 , wherein:
an orthogonal projection of the end of each of the contact members on the first substrate partially overlaps an orthogonal projection of the control electrode of one, in a position corresponding to the each of the contact members, of the switch transistors on the first substrate, and the each of the contact members is spaced from the control electrode of the one of the switch transistors by the preset distance so that when the second substrate is deformed by the force, at least one of the contact members in a location where the force is applied electrically contacts the control electrode of at least one of the switch transistors in a position corresponding to the at least one of the contact members.

5. The display panel of claim 4 , wherein:
a surface of the first substrate adjacent to the second substrate is covered with a protective layer; and
the protective layer is formed with a plurality of through holes, and each of the contact members electrically contacts the control electrode of one, located in a position corresponding to the each of the contact members, of the switch transistors through one of the through holes.

6. The display panel of claim 5 , wherein:
an orthogonal projection of each of the through holes on the first substrate partially overlaps an orthogonal projection of the control electrode of one, corresponding to the each through hole, of the switch transistors on the first substrate.

7. The display panel of claim 5 , wherein:
the preset distance is less than a thicknesses of the protective layer.

8. The display panel of claim 1 , wherein:
the contact member comprises a spacer.

9. The display panel of claim 1 , wherein:
the contact members are doped with an electrically-conductive material.

10. The display panel of claim 1 , wherein:
the plurality of switch transistors and the plurality of photosensitive elements are disposed in a display region.

11. A method of manufacturing a display panel, the method comprising:
manufacturing a first substrate, wherein the first substrate is formed with: a plurality of switch transistors arranged in an array, and a plurality of photosensitive elements arranged in an array and respectively connected with the plurality of switch transistors;
manufacturing a second substrate, wherein the second substrate is formed with a plurality of conductive contact members, and the plurality of contact members each have an end adjacent to the first substrate; and
assembling the first substrate and the second substrate together to form a display panel, wherein the end of each of the contact members is spaced from the first substrate by a preset distance so that when the second substrate is deformed by a force, the end of at least one of the contact members electrically contacts the first substrate so that at least one of the switch transistors in a position corresponding to the at least one of the contact members is turned on.

12. The method of claim 11 , wherein:
the switch transistors each have a control electrode configured to control a turn-on of the switch transistor, a first electrode and a second electrode, the second electrode is connected with one of the photosensitive elements to input an induced current generated by the one of the photosensitive elements when the one of the photosensitive elements is irradiated by a light, and the first electrode is configured to output the induced current when the switch transistor is turned on;
the first substrate is further formed with scan lines and data lines;
the first electrodes of the switch transistors are connected with the data lines, respectively; and
the contact members are electrically connected with the scan lines of the first substrate, respectively.

13. The method of claim 12 , wherein:
an orthogonal projection of the end of each of the contact members on the first substrate partially overlaps an orthogonal projection of the control electrode of one, in a position corresponding to the each of the contact members, of the switch transistors on the first substrate, and the each of the contact members is spaced from the control electrode of the one of the switch transistors by the preset distance so that when the second substrate is deformed by the force, at least one of the contact members in a location where the force is applied electrically contacts the control electrode of at least one of the switch transistors in a position corresponding to the at least one of the contact members.

14. The method of claim 12 , further comprising:
after manufacturing the first substrate, forming a protective layer on a surface of the first substrate adjacent to the second substrate; and forming a plurality of through holes in the protective layer, wherein each of the contact members electrically contacts the control electrode of one, located in a position corresponding to the each of the contact members, of the switch transistors through one of the through holes, wherein an orthogonal projection of each of the through holes on the first substrate partially overlaps an orthogonal projection of the control electrode of one, corresponding to the each through hole, of the switch transistors on the first substrate.

15. A fingerprint identification device, comprising:
a light source, an identification module, and the display panel according to claim 1 , wherein the identification module is connected with the display panel;
wherein the light source has a light emitting face facing towards the display panel, and is configured to emit a detection light;
wherein the display panel is configured such that when a finger of a user is pressed against the display panel, at least one of the switch transistors is turned on, and each of the photosensitive elements is configured to generate an induced current according to a part of the detection light ref

Assignees

• Boe Technology Group Co Ltd
• Hefei Boe Optoelectronics Tech

Inventors

• Chen Yimin
• Shao Xianjie

Classifications

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F1/325 Primary

  Power saving in peripheral device · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• H01L27/14636

  Electricity · mapped topic

• H01L27/283

  Electricity · mapped topic