Display Device

Patent metadata

Field	Value
Publication number	US-2021126066-A1
Application number	US-202016929797-A
Country	US
Kind code	A1
Filing date	Jul 15, 2020
Priority date	Oct 23, 2019
Publication date	Apr 29, 2021
Grant date	—

Abstract

The present disclosure relates to a display device including an optical device, more specifically, it relates to a display device in which the optical device is positioned under the display panel so that the optical device is not exposed in the front direction. Even if the optical device is located under the display panel, the display device can normally perform the function of the optical device related to the front direction of the display panel and have a structure for this.

First claim

What is claimed is:

1 . A display device comprising:
a transparent substrates; an optical device positioned in a display area under the transparent substrate; a transistor array positioned in the display area over the transparent substrate; an anode electrode layer positioned on the transistor array; a light emitting layer positioned on the anode electrode layer; a heterogeneous cathode electrode layer positioned on the light emitting layer and comprising a first cathode electrode and a second cathode electrode, wherein the first cathode electrode overlaps the optical device and is disposed in a first area which is a part of the display area, the second cathode electrode is disposed in a second area different from the first area in the display area, the first cathode electrode has a first transmittance, and the second cathode electrode has a second transmittance lower than the first transmittance; and an encapsulation layer disposed on the heterogeneous cathode electrode layer.

2 . The display device according to claim 1 , wherein the first cathode electrode is a transparent electrode having the first transmittance equal to or greater than a predetermined threshold transmittance, and the second cathode electrode is a translucent electrode having the second transmittance less than the predetermined threshold transmittance.

3 . The display device according to claim 1 , further comprising:
a bank defining an emission area of each of a plurality of subpixels, wherein the bank positioned between the anode electrode layer on which an anode electrode disposed in each of the plurality of subpixels is located, and the heterogeneous cathode electrode layer; and a spacer disposed in a boundary area between the first area and the second area, and positioned on the bank, wherein a boundary point between the first cathode electrode and the second cathode electrode is on the spacer.

4 . The display device according to claim 1 , wherein the first area has a first resolution, the second area has a second resolution, and the first resolution is lower than the second resolution.

5 . The display device according to claim 4 , wherein subpixels disposed in the first area constitute subpixel clusters including two or more subpixels, and
wherein a separation distance between the subpixel clusters is greater than a separation distance between two or more subpixels included in each of the subpixel clusters.

6 . The display device according to claim 5 , wherein a number of subpixels per unit area in the first area is less than a number of subpixels per unit area in the second area, and
wherein the subpixel clusters in the first area are regularly arranged.

7 . The display device according to claim 1 , further comprising:
a touch sensor layer disposed on the encapsulation layer and including a plurality of touch electrodes; a touch pad unit disposed on the transparent substrate and positioned in a non-display area, which is an outer area of the display area; and a plurality of touch lines electrically connected to all or part of the plurality of touch electrodes and descending along an inclined surface of the encapsulation layer to be electrically connected to the touch pad unit positioned in the non-display area.

8 . The display device according to claim 7 , wherein each of the plurality of touch electrodes positioned in the first area among the plurality of touch electrodes comprises a transparent electrode or a mesh-type electrode having one or more openings.

9 . The display device according to claim 7 , further comprising:
a polarizing plate disposed on the touch sensor layer; an optical transparent adhesive disposed on the polarizing plate; and a cover glass located on the optical transparent adhesive, wherein the polarizing plate comprises a first portion corresponding to the first area and a second portion corresponding to the second area, and wherein the first portion has a higher transmittance than the second portion.

10 . The display device according to claim 7 , wherein the optical device comprises a camera.

11 . The display device according to claim 10 , further comprising:
a light generating device; and a proximity sensor detecting a surrounding human body or object using light emitted from the light generating device, wherein the optical device further comprises the proximity sensor, wherein the light generating device is located on the encapsulation layer and is located on a side of the touch sensor layer, and wherein the proximity sensor is located under the transparent substrate.

12 . The display device according to claim 11 , wherein the proximity sensor is positioned to overlap the first area.

13 . The display device according to claim 11 , wherein the light generating device is located in a viewing area between the inclined surface of the encapsulation layer and the display area.

14 . The display device according to claim 7 , further comprising:
a fingerprint sensor panel disposed under the transparent substrate and including a plurality of fingerprint sensor blocks, wherein the fingerprint sensor panel comprises a hole or notch groove positioned in a portion corresponding to the first area.

15 . The display device according to claim 14 , wherein the fingerprint sensor panel comprises:
a substrate disposed under the transparent substrate and comprising the hole or notch groove positioned in the portion corresponding to the first area; a fingerprint transistor array disposed on the substrate and comprising transistors disposed in each of the plurality of fingerprint sensor blocks; a piezoelectric material layer disposed under the fingerprint transistor array; a common electrode disposed under the piezoelectric material layer; a plurality of scan lines disposed on the substrate to transmit scan signals to a plurality of fingerprint sensor block rows; and a plurality of read-out lines disposed on the substrate to sense signals from the plurality of fingerprint sensor block rows.

16 . The display device according to claim 15 , wherein the fingerprint sensor panel further comprises a plurality of scan driving blocks disposed on the substrate and disposed in an outer area of a fingerprint sensor area where the fingerprint transistor array is disposed on the substrate, wherein the plurality of scan driving blocks output the scan signals,
wherein the plurality of scan driving blocks comprise a first scan driving block located on one side and a second scan driving block located on another side, based on the hole or notch groove in the substrate, and wherein the plurality of scan lines comprise one or more first scan lines for transmitting scan signals output from the first scan driving block to one or more fingerprint sensor block rows located at one side of the hole or notch groove, and one or more second scan lines for transmitting scan signals output from the second scan driving block to one or more fingerprint sensor block rows located at another side of the hole or notch groove.

17 . The display device according to claim 15 , wherein the plurality of read-out lines include at least one read-out line arranged in a column direction while bypassing a side of the hole or notch groove.

18 . The display device according to claim 14 , further comprising:
a touch driving circuit configured to generate touch sensing data through the touch electrodes and output the touch sensing data; a fingerprint driving circuit configured to generate fingerprint sensing data through the fingerprint sens

Assignees

• Lg Display Co Ltd

Inventors

• Hwang Jonghee
• Kim Kiduk

Classifications

• G06V10/17

  using hand-held instruments · CPC title

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K59/8052

  Cathodes · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title