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Display device

A display device and color conversion technology, which is applied in the direction of instruments, optics, light guides, etc., can solve the problems of efficiency degradation and achieve the effect of improving color gamut and brightness

Active Publication Date: 2020-01-24
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cadmium-based quantum dots have safety issues, while other quantum dots have a problem of significantly degraded efficiency compared to cadmium-based quantum dots, so interest is focused on manufacturing applications that have relatively high efficiencies and do not have stability issues A backlight unit and a display device including the same

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0156] 0.8 parts by weight of a light-absorbing material (manufactured by Mitsubishi Chemical Corporation, PD319) based on 100 parts by weight of resin was added to a resin solution having a solid content of 30% (PMMA (BR80): epoxy functional acrylic (GMA acrylic) resin ( PD6400)=8:2, toluene:MEK (5:5)) and after mixing the resulting mixture uniformly, the first light absorbing layer with a thickness of 5um was fabricated on the TAC film by bar coating. The transmittance of the first light absorbing layer at a maximum absorption wavelength of 593 nm was determined to be 11.5% by a UV-visible spectrometer.

preparation example 2

[0158] A second light-absorbing layer was fabricated in the same manner as in the first light-absorbing layer except that 0.3 parts by weight of a light-absorbing material was added. The transmittance of the second light absorbing layer at a maximum absorption wavelength of 593 nm was determined to be 30% by a UV-visible spectrometer.

Embodiment 1

[0160] By adding polystyrene (PS), a green fluorescent substance with the following structure and TiO to dimethylformamide (DMF) 2 to prepare the first solution. In this case, 0.35 parts by weight of green fluorescent substance based on 100 parts by weight of PS and 3 parts by weight of TiO2 based on 100 parts by weight of PS were added thereto. 2 .

[0161]

[0162]

[0163] After applying the first solution to the plastic substrate, the first green film was produced by drying the solution.

[0164] By adding PS, a red phosphor with the following structure and TiO to DMF 2 to prepare the second solution. In this case, 0.07 parts by weight of red fluorescent substance based on 100 parts by weight of PS and 3 parts by weight of TiO2 based on 100 parts by weight of PS were added thereto. 2 .

[0165]

[0166]

[0167] After applying the second solution to the plastic substrate, the first red film was produced by drying the solution.

[0168] A first color convers...

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Abstract

The present specification relates to a display device comprising: a liquid crystal panel; and a backlight unit, wherein the backlight unit comprises at least one color conversion film; the liquid crystal panel or the backlight unit comprises a light-absorbing layer; the color conversion film comprises, during light emission, a first light-emitting peak and a second light-emitting peak; the first light-emitting peak has a light-emitting peak within 520nm to 535nm, the light-emitting peak having a maximum height in a wavelength range of 500nm to 560nm, and the light-emitting peak having a full width at half maximum of 50nm or less; and the second light-emitting peak has a light-emitting peak within 625nm to 640nm, the light-emitting peak having a maximum height in a wavelength range of 600nmto 780nm, and the light-emitting peak having a full width at half maximum of 60nm or less.

Description

technical field [0001] This application claims priority and benefit from Korean Patent Application No. 10-2018-0005007 filed with the Korean Intellectual Property Office on January 15, 2018, the entire contents of which are incorporated herein by reference. [0002] This specification relates to display devices. Background technique [0003] Existing light emitting diodes (LEDs) are obtained by mixing green and red phosphors into blue light emitting diodes or yellow and blue-green phosphors into UV light emitting diodes. However, in this method, it is difficult to control the color, and thus the color rendering property is not good. [0004] Therefore, the color gamut is degraded. [0005] In order to overcome the narrow color gamut and reduce the production cost, there have been recent attempts to realize green and red by utilizing the method of producing quantum dots in film form and combining them with blue LEDs. However, cadmium-based quantum dots have safety issues, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/13357
CPCG02F1/1336G02F1/133617G02B6/005G02F1/133624G02F1/133614G02F1/133514G02F1/133606G02F1/133607G02F1/133507G02F2202/046G02B6/0053
Inventor 金娜利申东穆金志浩吴惠美闵盛湧
Owner LG CHEM LTD