Pixel and display device including the same

Patent metadata

Field	Value
Publication number	US-12334019-B2
Application number	US-202318230956-A
Country	US
Kind code	B2
Filing date	Aug 7, 2023
Priority date	Oct 17, 2022
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A display device includes a pixel driving circuit, a first-type light-emitting element electrically connected to the pixel driving circuit, a second-type light-emitting element electrically connected to the pixel driving circuit, and a light path control layer disposed to overlap the second-type light-emitting element, where the light path control layer controls a path of light provided from the second-type light-emitting element.

First claim

What is claimed is:

1. A display device comprising:
a pixel driving circuit;
a first-type light-emitting element electrically connected to the pixel driving circuit;
a second-type light-emitting element electrically connected to the pixel driving circuit; and
a light path control layer disposed to overlap the second-type light-emitting element, wherein the light path control layer controls a path of light provided from the second-type light-emitting element,
wherein the light path control layer comprises a plurality of barrier ribs and a transmission portion between the plurality of barrier ribs, and
wherein each of the plurality of barrier ribs comprises a multi-layered film including a low-reflection layer having a reflectance of less than about 10 percent.

2. The display device of claim 1 , wherein a color of light provided from the first-type light-emitting element is substantially the same as a color of light provided from the second-type light-emitting element.

3. The display device of claim 1 , further comprising:
a data line, a plurality of scan lines, a plurality of light-emitting control lines, and a plurality of voltage lines, which are electrically connected to the pixel driving circuit,
wherein the pixel driving circuit comprises:
a driving transistor comprising a first electrode, a second electrode, and a gate electrode;
a switching transistor connected between the first electrode of the driving transistor and the data line;
a first light-emitting control transistor connected between the second electrode of the driving transistor and the first-type light-emitting element; and
a second light-emitting control transistor connected between the second electrode of the driving transistor and the second-type light-emitting element.

4. The display device of claim 3 , wherein:
the plurality of voltage lines comprises an initialization voltage line to which an initialization voltage is applied; and
the pixel driving circuit further comprises:
a first initialization transistor connected between the initialization voltage line and a first node between the first light-emitting control transistor and the first-type light-emitting element; and
a second initialization transistor connected between the initialization voltage line and a second node between the second light-emitting control transistor and the second-type light-emitting element.

5. The display device of claim 3 , wherein:
the plurality of voltage lines comprises a first driving voltage line to which a first driving voltage is applied and a second driving voltage line to which a second driving voltage different from the first driving voltage is applied;
the first-type light-emitting element and the second-type light-emitting element are connected to the second driving voltage line; and
the pixel driving circuit further comprises a third light-emitting control transistor connected between the first driving voltage line and the first electrode of the driving transistor.

6. The display device of claim 5 , wherein the plurality of light-emitting control lines comprises:
a first light-emitting control line connected to a gate electrode of the first light-emitting control transistor;
a second light-emitting control line connected to a gate electrode of the second light-emitting control transistor, wherein a signal applied to the second light-emitting control line is different from a signal applied to the first light-emitting control line; and
a third light-emitting control line connected to a gate electrode of the third light-emitting control transistor, wherein a signal applied to the third light-emitting control line is different from both the signal applied to the first light-emitting control line and the signal applied to the second light-emitting control line.

7. The display device of claim 5 , wherein the pixel driving circuit further comprises a fourth light-emitting control transistor connected between the first driving voltage line and the first electrode of the driving transistor.

8. The display device of claim 7 , wherein the plurality of light-emitting control lines comprise:
a first light-emitting control line connected to a gate electrode of the first light-emitting control transistor and a gate electrode of the third light-emitting control transistor; and
a second light-emitting control line connected to a gate electrode of the second light-emitting control transistor and a gate electrode of the fourth light-emitting control transistor, wherein a signal applied to the second light-emitting control line is different from a signal applied to the first light-emitting control line.

9. The display device of claim 1 , wherein the pixel driving circuit selectively operates in one of a first mode and a second mode,
wherein, in the second mode, the first-type light-emitting element does not emit light, and the second-type light-emitting element emits light.

10. The display device of claim 9 , wherein, in the first mode, the first-type light-emitting element and the second-type light-emitting element alternately emit light in a time-division manner.

11. The display device of claim 9 , wherein, in the first mode, the second-type light-emitting element does not emit light, and the first-type light-emitting element emits light.

12. The display device of claim 9 , wherein, in the first mode, the first-type light-emitting element and the second-type light-emitting element simultaneously emit light.

13. The display device of claim 1 , wherein:
a first light-emitting region is defined in the first-type light-emitting element;
a second light-emitting region is defined in the second-type light-emitting element; and
the plurality of barrier ribs overlaps the second light-emitting region.

14. The display device of claim 13 , wherein the light path control layer is provided in plural,
wherein a plurality of light path control layers is sequentially stacked in a direction away from the first-type light-emitting element and second-type light-emitting element.

15. The display device of claim 13 , wherein
each of the plurality of barrier ribs extends in a first direction, and
a width of the second light-emitting region in the first direction is less than a length of each of the plurality of barrier ribs in the first direction.

16. An electronic device comprising:
a display panel comprising a plurality of pixel units; and
a light path control layer disposed on the display panel and comprising a plurality of barrier ribs which controls a path of light provided from the display panel,
wherein each of the plurality of pixel units comprises:
X light-emitting elements, wherein X is a positive integer; and
Y pixel driving circuits which drive the X light-emitting elements, wherein Y is a positive integer less than X,
wherein the X light-emitting elements comprise:
a plurality of first-type light-emitting elements not overlapping the plurality of barrier ribs; and
a plurality of second-type light-emitting elements overlapping the plurality of barrier ribs.

17. The electronic device of claim 16 , wherein:
the plurality of first-type light-emitting elements comprises a first first-type light-emitting element, a second first-type light-emitting element, and a third first-type light-emitting element; and
the plurality of second-type light-emitting elements comprises a first second-type light-emitting element, a second second-type light-emitting element, and a third second-type light-emitting element,
wherein:
a color of light provided from the first first-type light-emitting ele

Assignees

• Samsung Display Co Ltd

Inventors

• Chung Jinkoo
• Kim Seong-Min
• Choi Beohmrock

Classifications

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G09G2300/023

  Display panel composed of stacked panels · CPC title

• G09G2300/0443

  with several sub-pixels for the same colour in a pixel, not specifically used to display gradations (G09G3/364 takes precedence) · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title