Emissive display with photo-switchable polarization

Patent metadata

Field	Value
Publication number	US-9444075-B2
Application number	US-201414554286-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Nov 26, 2014
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

Novel emissive display module and an emissive display assembly are disclosed. The emissive display module and the emissive display assembly incorporate a photo-switchable polarizer that is switchable between an active, polarizing, state and an inactive, non-polarizing, state depending on the predetermined level of intensity of UV light in the ambient light and enhance the viewable quality of the emissive display by minimizing or eliminating UV light reflection on the emissive display.

First claim

What is claimed is:

1. An emissive display module comprising:
a substrate;
an array of OLED light emissive elements provided over the substrate; and
a photo-switchable polarizer provided over the array of OLED light emissive elements,

wherein the photo-switchable polarizer is switchable between an active state and an inactive state depending on a level of intensity of UV light in ambient light of the emissive display module.

2. The emissive display module of claim 1 , wherein the photo-switchable polarizer is in the active state when the level of intensity of the UV light in the ambient light is greater than or equal to a predetermined level and the photo-switchable polarizer is in the inactive state when the level of intensity of the UV light in the ambient light is less than the predetermined level.

3. The emissive display module of claim 1 , wherein the photo-switchable polarizer is a circular polarizer.

4. The emissive display module of claim 3 , wherein the photo-switchable polarizer is in the active state when the level of intensity of the UV light in the ambient light is greater than or equal to a predetermined level and the photo-switchable polarizer is in the inactive state when the level of intensity of the UV light in the ambient light is less than the predetermined level.

5. The emissive display module of claim 1 , wherein the photo-switchable polarizer comprises one or more azobenzene compounds doped in a polymer material selected from poly-methylmethacrylate or poly-vinyl polymer.

6. The emissive display module of claim 5 , wherein the azobenzene compound has a structure according to Formula 1:

wherein R a , R b , and R 1 -R 8 are each independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, haloalkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, thioalkoxy, aryloxy, thioaryloxy, amino, arylamino, diarylamino, carbazolyl, silyl, halosilyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

7. The emissive display module of claim 1 , wherein the photo-switchable polarizer comprises one or more polymer compounds with azobenzene derivative pendant groups, the one or more polymer compounds having a structure according to Formula 2:

wherein R a , R b , R 1 -R 8 and A 1 -A 7 are each independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, haloalkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, thioalkoxy, aryloxy, thioaryloxy, amino, arylamino, diarylamino, carbazolyl, silyl, halosilyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
L is a linker; and
x is an integer ≧1 and y is integer ≧0.

8. The emissive display module of claim 1 , wherein the photo-switchable polarizer is a linear polarizer, the emissive display module further comprising a quarter wave plate located between the photo-switchable polarizer and the array of OLED light emissive elements.

9. The emissive display module of claim 8 , wherein the photo-switchable polarizer is configured to be in the active state when the level of intensity of the UV light in the ambient light is greater than or equal to a predetermined level and the photo-switchable polarizer is configured to be in the inactive state when the level of intensity of the UV light in the ambient light is less than the predetermined level.

Assignees

• Universal Display Corp

Inventors

• Kwong Raymond

Classifications

• C07C245/08

  with the two nitrogen atoms of azo groups bound to carbon atoms of six-membered aromatic rings, e.g. azobenzene · CPC title

• G02B1/08

  made of polarising materials · CPC title

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K50/868

  Arrangements for polarized light emission (H10K50/86 takes precedence) · CPC title

• G02F1/0126 Primary

  Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass · CPC title