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Electroluminescent displays

A luminescent and display technology, applied in the field of electroluminescent displays, can solve the problems of reducing the electro-optical performance of PDLC and poor environmental stability of displays, and achieve the effect of increasing environmental stability

Inactive Publication Date: 2010-01-20
PELIKON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The inventors have found that the use of NCAP PDLC materials with PVA as a binder is unsatisfactory because even though PVA is an excellent binder, providing very stable emulsions, it readily absorbs atmospheric water which in turn passes through Water-related current leakage degrades electro-optic performance of PDLC
Therefore, displays fabricated using PVA as a binder in the LC layer have poor environmental stability, which can lead to defects such as display spotting

Method used

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Examples

Experimental program
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Effect test

example 1

[0071] A stock solution of nematic liquid crystal BL006 (Merck Chemicals) containing 2% black dye S428 (Mitsui Chemicals) was prepared by adding 1 gram of S428 to 49 grams of BL006 and stirring the mixture at about 60°C for 1 hour. The mixture was placed in an oven at 60°C for another 18 hours, then cooled to room temperature and filtered through a 0.2 micron filter. Desmodur N3200 (Bayer) (1.8 g) was added to a portion of the dyed liquid crystal (36 g) and the mixture was stirred at 60°C until a homogeneous solution was produced (about 10 minutes). This solution was then added to 10% polyvinyl alcohol (Celvol 205, Celanese Chemicals) (120 g) stirred (350 rpm, 4 cm diameter impeller), and the temperature was maintained at 50°C by means of a circulating water bath. . After the addition is complete, the impeller speed is increased to 3000 rpm and maintained for 8 minutes, at which time the speed is reduced to 750 rpm. The temperature was maintained at 50°C and stirring was cont...

example 2

[0077] According to the method of Example 1, the PDLC coating was prepared using BL093 (Merck Chemicals) instead of BL006. The final PDLC contained 60% by weight of BL093 (including 3% by weight (based on BL093) S428).

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Abstract

An electroluminescent display comprising a mask (13) defining the information to be displayed mounted in front of an electroluminescent (EL) material backlight (16). The mask (13) comprises a layer of liquid crystal vesticles (14) encapsulated in a curable polymer matrix (15), where the polymer chains of the polymer matrix (15) have been cross-linked by exposure to radiation. Preferably the polymer matrix is a UV curable polyurethane. The invention also concerns a method of making such a display.

Description

Technical field [0001] The present invention relates to electroluminescent displays, and more specifically, to displays that are electroluminescent / liquid crystal hybrids. Background technique [0002] Certain materials are of the electroluminescent type, that is, when an electric field is generated across them, they emit light and therefore glow. The first known electroluminescent materials are inorganic particulate matter such as zinc sulfide, while the newly discovered electroluminescent materials include many small molecule organic emitters called organic light-emitting diodes (OLED) and some called light-emitting polymers (LEP). ) Plastic synthetic organic polymer. Inorganic particles in the doped and encapsulated form are still in use, especially when mixed in the adhesive and applied as a relatively thick layer on the substrate surface; LEP can be in the form of particulate material in the adhesive matrix It is used or to some extent advantageously used alone in the form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1334G02F1/13357
CPCG02F1/1334G02F2201/44G02F1/133603G02F1/13737G02F1/1335H05B33/00
Inventor 克斯托弗·迈尔斯·易文斯
Owner PELIKON
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