Display Panel and Display Device

• US 20190325186A1
• Filed: 12/21/2018
• Published: 10/24/2019
• Est. Priority Date: 04/20/2018
• Status: Active Grant

• Current Assignee: Wuhan Tianma Micro-Electronics Company Limited (Wuhan Donghu New Technology Development Zone Production Promotion Centre), Wuhan Tianma Microelectronics Company Limited Shanghai Branch
• Original Assignee: Shanghai Tianma AM-OLED Co. Ltd (Tianma Microelectronics Company Limited)
• Inventors: Gao, Yana, Zhou, Xingyao, Li, Yue, Xiang, Dongxu, Liu, Xinzhao
• Granted Patent: US 10,936,842 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06V 10/17 using hand-held instruments
• CPC Class Codes: G06V 40/1306 non-optical, e.g. ultrasonic or capacitive sensing
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G06V 40/1376 Matching features related to ridge properties or fingerprint texture

Abstract

Provided are a display panel and a display device. The display panel includes a display assembly and a fingerprint recognition assembly. The display assembly includes a base substrate, a plurality of pixel units disposed on one side of the base substrate and a first scanning line extending along a first direction, each of the plurality of pixel units includes a pixel driving unit and a light-emitting unit disposed on one side of the pixel driving unit facing away from the base substrate, and the light-emitting unit includes a metal anode. The fingerprint recognition assembly is configured to perform fingerprint recognition according to light reflected by a touch object to a fingerprint recognition unit. A vertical projection of the first scanning line on the base substrate and a vertical projection of the metal anode on the base substrate have an overlapping area.

Claims

1. A display panel, comprising:

a display assembly, wherein the display assembly comprises a base substrate, a plurality of pixel units disposed on one side of the base substrate and a first scanning line extending along a first direction, wherein each of the plurality of pixel units comprises a pixel driving unit and a light-emitting unit disposed on one side of the pixel driving unit facing away from the base substrate, wherein the light-emitting unit comprises a metal anode; and

a fingerprint recognition assembly disposed on one side of the base substrate facing away from the pixel driving unit, wherein the fingerprint recognition assembly comprises at least one fingerprint recognition unit, and the at least one fingerprint recognition unit is configured to perform fingerprint recognition according to light reflected by a touch object to the fingerprint recognition unit;

wherein the pixel driving unit comprises a light-emitting reset transistor, the light-emitting reset transistor is configured to provide an initial voltage for the light-emitting unit before a display stage, wherein the light-emitting reset transistor comprises a gate electrode electrically connected to the first scanning line, a drain electrode electrically connected to a reference voltage, and a source electrode electrically connected to the metal anode, wherein a vertical projection of the first scanning line on the base substrate and a vertical projection of the metal anode on the base substrate have an overlapping area; and

the display panel further comprises a shield electrode disposed between a film layer in which the first scanning line is located and a film layer in which the drain electrode is located, wherein the shield electrode is connected to one fixed potential, the shield electrode is insulated from the drain electrode, and a vertical projection of the shield electrode on the base substrate is overlapped with the overlapping area.

2. The display panel according to claim 1, wherein the overlapping area is completely covered by the vertical projection of the shield electrode on the base substrate.

3. The display panel according to claim 1, further comprising a reference voltage line extending along the first direction, the reference voltage line is configured to provide the reference voltage, wherein the shield electrode and the reference voltage line are located in a same layer.

4. The display panel according to claim 1, further comprising a first power signal line extending along a second direction, wherein the shield electrode is electrically connected to the first power signal line, and the second direction is intersected with the first direction.

5. The display panel according to claim 4, wherein the first power signal line and the drain electrode are disposed in a same layer.

6. The display panel according to claim 5, wherein the vertical projection of the shield electrode on the base substrate is overlapped with a vertical projection of the first power signal line on the base substrate, and the shield electrode is electrically connected to the first power signal line via a via hole.

7. The display panel according to claim 1, wherein part of the first scanning line is reused as the gate electrode.

8. The display panel according to claim 4, wherein the display panel further comprises a storage capacitor, a second scanning line extending along the first direction and a light-emitting control signal line, and wherein the pixel driving unit further comprises a data signal writing transistor, a driving transistor, a memory cell reset transistor and a light-emitting control transistor;

wherein

the first scanning line is electrically connected to a gate electrode of the memory cell reset transistor, the second scanning line is electrically connected to a gate electrode of the data signal writing transistor, the light-emitting control signal line is electrically connected to a gate electrode of the light-emitting control transistor, a first plate of the storage capacitor is electrically connected to the first power signal line, and a second plate of the storage capacitor is electrically connected to a gate electrode of the driving transistor; and

the shield electrode and the first plate of the storage capacitor are disposed in a same layer.

9. The display panel according to claim 8, wherein the first scanning line, the second scanning line and the light-emitting control signal line are disposed in a same layer and distributed in a cyclic manner.

10. The display panel according to claim 8, wherein the vertical projection of the shield electrode on the base substrate is not overlapped with vertical projections of the second scanning line and the light-emitting control signal line on the base substrate.

11. The display panel according to claim 4, further comprising a second power signal line extending along the first direction, wherein the first power signal line and the second power signal line are disposed in different layers and the first power signal line is electrically connected to the second power signal line via a via hole.

12. The display panel according to claim 1, wherein the light-emitting unit provides a light source for the fingerprint recognition assembly, and the fingerprint recognition unit is configured to perform fingerprint recognition according to light emitted from the light-emitting unit and reflected by the touch object to the fingerprint recognition unit.

13. The display panel according to claim 1, further comprising:

a fingerprint recognition light source, wherein the fingerprint recognition light source is disposed on one side of the fingerprint recognition assembly facing away from the base substrate;

wherein

light emitted from the fingerprint recognition light source is irradiated to the touch object via a gap between two adjacent fingerprint recognition units, and the fingerprint recognition unit is configured to perform fingerprint recognition according to light emitted from the fingerprint recognition light source and reflected by the touch object to the fingerprint recognition unit.

14. The display panel according to claim 13, wherein the fingerprint recognition light source is a collimated light source.

15. A display device, comprising a display panel, wherein the display panel comprises:

a display assembly, wherein the display assembly comprises a base substrate, a plurality of pixel units disposed on one side of the base substrate and a first scanning line extending along a first direction, wherein each of the plurality of pixel units comprises a pixel driving unit and a light-emitting unit disposed on one side of the pixel driving unit facing away from the base substrate, wherein the light-emitting unit comprises a metal anode; and

a fingerprint recognition assembly disposed on one side of the base substrate facing away from the pixel driving unit, wherein the fingerprint recognition assembly comprises at least one fingerprint recognition unit, and the at least one fingerprint recognition unit is configured to perform fingerprint recognition according to light reflected by a touch object to the fingerprint recognition unit;

wherein the pixel driving unit comprises a light-emitting reset transistor, the light-emitting reset transistor is configured to provide an initial voltage for the light-emitting unit before a display stage, wherein the light-emitting reset transistor comprises a gate electrode electrically connected to the first scanning line, a drain electrode electrically connected to a reference voltage, and a source electrode electrically connected to the metal anode, wherein a vertical projection of the first scanning line on the base substrate and a vertical projection of the metal anode on the base substrate have an overlapping area; and

the display panel further comprises a shield electrode disposed between a film layer in which the first scanning line is located and a film layer in which the drain electrode is located, wherein the shield electrode is connected to one fixed potential, the shield electrode is insulated from the drain electrode, and a vertical projection of the shield electrode on the base substrate is overlapped with the overlapping area.