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Dye based circularly polarizing film for organic light emitting diodes

A technology of light-emitting diodes and circular polarizers, which is applied to the materials of organic semiconductor devices, luminescent materials, organic semiconductor devices, etc., can solve the problems of reducing external quantum efficiency, improve external luminous efficiency, increase brightness, and reduce power consumption Effect

Inactive Publication Date: 2007-02-07
SHINWHA OPLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing organic light-emitting diode display, in order to control the reflected light from the external incident light and increase the contrast, a circular polarizer with a visible light transmittance of about 42% to 43% is generally used in a single piece, so the circular polarizer is reduced accordingly. On-chip external quantum efficiency

Method used

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  • Dye based circularly polarizing film for organic light emitting diodes
  • Dye based circularly polarizing film for organic light emitting diodes
  • Dye based circularly polarizing film for organic light emitting diodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The circular polarizer of Example 1 was manufactured through the following steps.

[0061] (1) washing

[0062] Add 20000 g of normal temperature water into a 25000 ml cleaning tank, and fully wash polyvinyl alcohol (PVA) (product of Kuraray Company, trade name VF-P#7500) with a width of 310 mm for two minutes.

[0063] (2) swelling

[0064] Add 24000g of water into the swelling tank of 30000ml and heat up to 35 degrees, and place the PVA film through the above (1) water washing process for 1 minute and 30 seconds to swell.

[0065] (3) Dichroic dye (polarizer) dyeing

[0066] In the dissolving tank of 20000ml, add 265g of the dyestuff of chemical formula 1 and 20g of chemical formula 2 of the above-mentioned group A, and heat to make it dissolve completely. The solution was transferred to a 90000ml dyeing tank, and 50000g of warm water was added. Here, 700 g of sodium sulfate was added to dissolve it completely, and then cooled to 42 degrees. The membrane swollen ...

Embodiment 2

[0092] With the dichroic dye 260g of the chemical formula 4 of group B, this single dyestuff replaces the dichroic dye in the dyeing process (3) of embodiment 1, i.e. the dichroic dye 265g of the chemical formula 1 of group A and the dichroic dye of the chemical formula 2 Except for 20 g of dichroic dyes, steps (1) to (14) were performed using the same method as in Example 1 to manufacture a circular polarizing plate.

[0093] The same method as in Example 1 was used for the manufactured polarizer, and its optical characteristics and power consumption were measured.

Embodiment 3

[0095] Replace the dichroic dye in the dyeing process (3) of embodiment 1 with the mixture of the dichroic dye 255g of chemical formula 4 of group B and the dyestuff 4.5g of chemical formula 6 of group C, i.e. the dichroic dye of chemical formula 1 of group A Except for 265 g of the neutral dye and 20 g of the dichroic dye of the chemical formula 2, the same method as in Example 1 was used to perform steps (1) to (14) to manufacture a circular polarizer.

[0096] The same method as in Example 1 was used for the manufactured polarizer, and its optical characteristics and power consumption were measured.

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Abstract

The present invention relates to a dye based circularly polarizing film for organic light emitting diodes, which includes a polarized light film made of polyvinyl alcohol and 1 / 4 wave plate, characterized in that, the polarized light film is color dyeing and spreading through configuring a high dichroism dye. In the absorption wavelength region 500-640 nm, the principal absorption wavelength bandwidth is 80-120 nm and the average monolithic transmittance is 53 -59% in the visible wavelength 380-780 nm. Utilizing the characteristic of the photopic vision phenomena and the green light having the highest luminous efficiency in the OLED tricolor, the color polarized light film is used to confine the wavelength 500-640 nm and replaces the film with no reflection that restrains the full wavelength of the visible light, so the circular polarization sheet which has the contrast with no evident depress is produced and the external quantum efficiency is improved by 25-37%. Jointed on one side of the cellulose triacetated film of the two sides of the polarized light film, anti dazzle or low reflective coating or the film having the two functions, is used to improve the contrast. The invention can improve the luminous efficiency, reduce the electric power consumption and advance the life of the OLED.

Description

technical field [0001] The invention relates to a circular polarizer capable of reducing power consumption (or increasing brightness under the same power consumption condition) under the same brightness in an OLED (Organic Light Emitting Diode Display) and a manufacturing method thereof. Background technique [0002] In the prior art, as an anti-reflection polarizing film (Anti-Reflection polarizing film) in an organic light-emitting diode display, a kind of iodine middle gray polarizer (polarizing film) with a light transmittance of 42-43% and 1 / The anti-reflection film (Anti-Reflection film) that combines 4 wavelength plates into one, that is, circularly polarizing film (Circularly polarizing film). However, although this circular polarizer can shield light from the outside, when the photons generated by the organic light-emitting layer pass through the polarizing film layer with an average light transmittance of 42-43%, only 42-43% pass through. It solves the problem th...

Claims

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Application Information

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IPC IPC(8): G02B5/30G09F9/33
CPCC09K11/06H01L2924/12044H10K50/85H10K50/868H10K2102/00H10K2102/3023
Inventor 金海刚林寿一金度亨
Owner SHINWHA OPLA
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