Display apparatus

Patent metadata

Field	Value
Publication number	US-10580838-B2
Application number	US-201715641524-A
Country	US
Kind code	B2
Filing date	Jul 5, 2017
Priority date	Jul 19, 2016
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

A display apparatus includes a first polarizer, a second polarizer facing the first polarizer, an organic light emitting element overlapping the first polarizer and the second polarizer, a first electrode and a second electrode between the first polarizer and the second polarizer and facing each other, and a liquid crystal layer between the first electrode and the second electrode.

First claim

What is claimed is:

1. A display apparatus, comprising:
a first polarizer;
a second polarizer facing the first polarizer;
an organic light emitting element overlapping the first polarizer and the second polarizer, wherein the organic light emitting element includes a light emitting structure and a thin film transistor, the thin film transistor being electrically connected to the light emitting structure, and the thin film transistor is directly on the first polarizer; and
a liquid crystal switching panel between the first polarizer and the second polarizer, the liquid crystal switching panel including:
a first electrode and a second electrode facing each other; and
a liquid crystal layer between the first electrode and the second electrode, wherein the organic light emitting element is between the liquid crystal layer and the first polarizer.

2. The display apparatus as claimed in claim 1 , wherein the first polarizer is a wire grid polarizer.

3. The display apparatus as claimed in claim 2 , wherein the wire grid polarizer comprises aluminum and/or silver, and a thickness of the wire grid polarizer has 50 nm (nanometers) or more.

4. The display apparatus as claimed in claim 1 , wherein a first polarizing axis of the first polarizer and a second polarizing axis of the second polarizer are perpendicular to each other.

5. The display apparatus as claimed in claim 1 , wherein phase of light which passes the liquid crystal layer is maintained or retarded by 45 degree according to voltages applied to the first and second electrodes.

6. The display apparatus as claimed in claim 1 , wherein the light emitting structure has a pixel electrode electrically connected to the thin film transistor, an opposite electrode facing the pixel electrode, and an organic light emitting layer between the pixel electrode and the opposite electrode.

7. The display apparatus as claimed in claim 6 , wherein:
the organic light emitting element comprises a light emitting area for displaying an image, and a transmitting area through which light passes,
the pixel electrode is disposed only at the light emitting area,
the light emitting area includes first and second light emitting portions being spaced apart from each other in a first direction, and
the transmitting area extends along sides of the first and second light emitting portions in the first direction.

8. The display apparatus as claimed in claim 7 , further comprising:
a first light blocking part disposed at a boundary of the light emitting area and the transmitting area to overlap the boundary,
wherein the first light blocking part reflects light.

9. The display apparatus as claimed in claim 8 , wherein the second polarizer is a wire grid polarizer including a wire grid pattern, and the wire grid pattern and the first light blocking part are formed from a same layer.

10. The display apparatus as claimed in claim 1 , wherein:
the display apparatus is driven in a mirror mode, a mirror-display mode, a transparent-display mode and transparent mode according to on/off of the organic light emitting element and the liquid crystal layer,
the display apparatus works as a mirror in the mirror mode,
the display apparatus works as a mirror and displays an image in the mirror-display mode,
the display apparatus works as a transparent glass and displays an image in the transparent-display mode, and
the display apparatus works as a transparent glass in the transparent mode.

11. The display apparatus as claimed in claim 1 , further comprising a second light blocking part on the first polarizer opposite to the second polarizer with respect to the first polarizer.

12. The display apparatus as claimed in claim 11 , wherein:
the display apparatus is driven in a mirror mode, a mirror-display mode, a display mode, and black mode according to on/off of the organic light emitting element and the liquid crystal layer,
the display apparatus works as a mirror in the mirror mode,
the display apparatus works as a mirror and displays an image in the mirror-display mode,
the display apparatus displays an image in the display mode, and
the display apparatus works as a black screen in the black mode.

13. The display apparatus as claimed in claim 1 , wherein the second polarizer is a polyvinyl alcohol (PVA) polarizer.

14. The display apparatus as claimed in claim 1 , wherein the display apparatus has a front emission structure.

15. The display apparatus as claimed in claim 10 , wherein:
in the mirror mode, the organic light emitting element is in off state and the liquid crystal switching panel is off state, so that the organic light emitting element does not emit light, and the liquid crystal layer does not change phase of light passing the liquid crystal layer,
in the mirror-display mode, the organic light emitting element is in on state and the liquid crystal switching panel is off state, so that the organic light emitting element emits light, and the liquid crystal layer does not change phase of light passing the liquid crystal layer,
in the transparent-display mode, the organic light emitting element is in on state and the liquid crystal switching panel is on state, so that the organic light emitting element emits light, and the liquid crystal layer retards the phase of light passing the liquid crystal layer by 45 degrees, and
wherein in the transparent mode, the organic light emitting element is in off state and the liquid crystal switching panel is on state, so that the organic light emitting element does not emit light, and the liquid crystal layer retards the phase of light passing the liquid crystal layer by 45 degrees.

16. A display apparatus, comprising:
a first base substrate;
a third base substrate facing the first base substrate;
a second base substrate between the first base substrate and the third base substrate;
a first polarizer on the first base substrate;
an organic light emitting element between the first base substrate and the second base substrate; and
a first electrode, a liquid crystal layer, and a second electrode between the second base substrate and the third base substrate, wherein the organic light emitting element is between the liquid crystal layer and the first polarizer, wherein
the organic light emitting element includes a light emitting structure and a thin film transistor, the thin film transistor being electrically connected to the light emitting structure, and
the thin film transistor is directly on the first polarizer.

17. The display apparatus as claimed in claim 16 , wherein: the first polarizer comprises a wire grid polarizer having aluminum and/or silver, and a thickness of the wire grid polarizer has 50 nm (nanometers) or more.

18. The display apparatus as claimed in claim 16 , further comprising a first light blocking part on the third base substrate.

19. The display apparatus as claimed in claim 18 , wherein the first light blocking part defines a plurality of openings, and reflects external light.

20. The display apparatus as claimed in claim 16 , further comprising a second light blocking part disposed on the second base substrate.

21. A display apparatus, comprising:
a first polarizer comprising a wire grid pattern;
a second polarizer facing the first polarizer;
an organic light emitting element to display an image disposed between the first polarizer and the second polarizer; and
a liquid crystal switching panel to control phase of light disposed between the second polarizer and the organic light

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Dae-Young
• Park Sangho
• Lee Seungmin
• Jo Gugrae

Classifications

• G02F2201/44

  Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• H01L27/326

  Electricity · mapped topic

• G02F1/1393 Primary

  the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells (G02F1/1396, G02F1/141 take precedence) · CPC title