Organic light emitting device including circular polarizing plate having retardations corresponding to pixels

Patent metadata

Field	Value
Publication number	US-10317595-B2
Application number	US-201514789206-A
Country	US
Kind code	B2
Filing date	Jul 1, 2015
Priority date	Feb 11, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

An organic light emitting device includes a display panel including a plurality of pixels and a circular polarizing plate disposed opposite to the display panel, where the circular polarizing plate has a plurality of retardations corresponding to the pixels of the display panel. A method of manufacturing an organic light emitting device includes preparing a display panel including a plurality of pixels, preparing a circular polarizing plate having a plurality of retardations, and assembling the display panel and the circular polarizing plate, where the display panel and the circular polarizing plate are assembled so that the retardations of the circular polarizing plate respectively correspond to the pixels of the display panel.

First claim

What is claimed is:

1. An organic light emitting device, comprising
a display panel comprising a plurality of pixels, the display panel including a pair of electrodes and an emission layer between the pair of electrodes, the plurality of pixels including a blue pixel, a green pixel, and a red pixel, which display blue, green and red, respectively, and
a circular polarizing plate disposed opposite to the display panel and comprising a compensation film and a polarizer, the circular polarizing plate being positioned closer than the display panel from a side of a viewer,
wherein
the compensation film is a single-layered λ/4 plate,
the compensation film includes a first region corresponding to the blue pixel and having a first retardation, a second region corresponding to the green pixel and having a second retardation, and a third region corresponding to the red pixel and having a third retardation,
the retardations of the compensation film satisfy the following relationship: Re1>Re2≥Re3; or Re1≥Re2>Re3,
wherein Re1, Re2 and Re3 denote the first, second and third retardations, respectively,
the first retardation is in a range of about 125 nm to about 155 nm,
the second retardation is in a range of about 110 nm to about 160 nm, and
the third retardation is in a range of about 110 nm to about 125 nm.

2. The organic light emitting device of claim 1 , wherein a microcavity effect occurs in the pixels of the display panel.

3. The organic light emitting device of claim 1 , wherein
the first retardation is in a range of about 135 nm to about 145 nm,
the second retardation is in a range of about 130 nm to about 140 nm, and
the third retardation is in a range of about 115 nm to about 125 nm.

4. The organic light emitting device of claim 1 , wherein the compensation film comprises a cured liquid crystal.

5. The organic light emitting device of claim 1 , wherein a reflectance in each of the blue pixel, the green pixel and the red pixel is less than or equal to about 5%.

6. The organic light emitting device of claim 1 , wherein a reflection color shift (Δa*b*) in each of the blue pixel, the green pixel and the red pixel is less than or equal to about 5.

7. The organic light emitting device of claim 1 , wherein a reflection color shift (Δa*b*) of the organic light emitting device is less than or equal to about 5.

8. The organic light emitting device of claim 1 , further comprising:
an encapsulation substrate disposed opposite to the display panel,
the compensation film is attached to a first surface of the encapsulation substrate, and
the polarizer is attached to a second surface of the encapsulation substrate, which is opposite to the first surface.

9. A method of manufacturing an organic light emitting device, comprising:
preparing a display panel including a blue pixel, a green pixel and a red pixel which display blue, green and red, respectively, the display panel including a pair of electrodes and an emission layer between the pair of electrodes;
preparing a circular polarizing plate including a compensation film and a polarizer, the compensation film including a first region having a first retardation, a second region having a second retardation, and a third region having a third retardation; and
assembling the display panel and the circular polarizing plate,
wherein the display panel and the circular polarizing plate are assembled so that the first, second and third retardations of the compensation film respectively correspond to the blue pixel, the green pixel, and the red pixel of the display panel,
the retardations of the compensation film satisfy the following Relationship: Re1>Re2≥Re3; or Re1≥Re2>Re3, wherein Re1, Re2 and Re3 denote the first, second and third retardations, respectively,
the first retardation is in a range of about 125 nm to about 155 nm,
the second retardation is in a range of about 110 nm to about 160 nm,
the third retardation is in a range of about 110 nm to about 125 nm,
the circular polarizing plate being positioned closer than the display panel from the side of a viewer, and
the compensation film is a single-layered λ/4 plate.

10. The method of claim 9 , wherein the preparing the compensation film comprises:
providing a liquid crystal layer for the compensation film on a first surface of a substrate, and
curing the liquid crystal layer for the compensation film while changing a temperature to provide the first, second and third regions having different retardations from each other.

11. The method of claim 10 , wherein the curing the liquid crystal layer for the compensation film comprises:
disposing a mask on the liquid crystal layer and performing a first exposure at a first temperature to provide the first region;
disposing a mask on the liquid crystal layer and performing a second exposure at a second temperature to provide the second region; and
performing a third exposure at a third temperature to provide the third region.

12. The method of claim 11 , wherein
the second temperature is higher than the first temperature, and
the third temperature is higher than the second temperature.

13. The method of claim 10 , further comprising:
providing an alignment layer on the substrate before the providing the liquid crystal layer for the compensation film.

14. The method of claim 10 , further comprising:
providing the polarizer on a second surface of the substrate, which is opposite to the first surface,
wherein the substrate is an encapsulation substrate.

15. The method of claim 9 , wherein
the first retardation is in a range of about 135 nm to about 145 nm,
the second retardation is in a range of about 130 nm to about 140 nm, and
the third retardation is in a range of about 115 nm to about 125 nm.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Ohyama Tsuyoshi
• Lee Eun Sung
• Hamamoto Nobuo

Classifications

• G02B5/3025 Primary

  Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence) · CPC title

• G02B5/3016

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02B5/3008

  comprising dielectric particles, e.g. birefringent crystals embedded in a matrix · CPC title

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• H01L51/5293

  Electricity · mapped topic