WO2018008938A1 - Feuille optique, unité de rétroéclairage et dispositif d'affichage les comprenant - Google Patents

Feuille optique, unité de rétroéclairage et dispositif d'affichage les comprenant Download PDF

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Publication number
WO2018008938A1
WO2018008938A1 PCT/KR2017/007071 KR2017007071W WO2018008938A1 WO 2018008938 A1 WO2018008938 A1 WO 2018008938A1 KR 2017007071 W KR2017007071 W KR 2017007071W WO 2018008938 A1 WO2018008938 A1 WO 2018008938A1
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WO
WIPO (PCT)
Prior art keywords
diffusion layer
light
optical sheet
layer
surface roughness
Prior art date
Application number
PCT/KR2017/007071
Other languages
English (en)
Korean (ko)
Inventor
이기욱
이병훈
임채리
이민수
Original Assignee
주식회사 엘엠에스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 엘엠에스 filed Critical 주식회사 엘엠에스
Publication of WO2018008938A1 publication Critical patent/WO2018008938A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/462—Computing operations in or between colour spaces; Colour management systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G01J3/526—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts for choosing a combination of different colours, e.g. to produce a pleasing effect for an observer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters

Definitions

  • the present invention relates to an optical sheet for converting color coordinates of incident light.
  • Liquid crystal displays are display devices used in notebooks, personal computers, mobile terminals, TVs, and the like, and their characteristics are improved year by year as demand for liquid crystal displays increases.
  • a liquid crystal display device which is a non-light emitting element, includes a back light unit as a light source.
  • the backlight includes a light source and a plurality of optical sheets.
  • the optical sheet collects or diffuses incident light to supply uniform light to the liquid crystal panel.
  • the light provided by the backlight unit provides a relatively yellowish white light.
  • the white light has a low color temperature, the light efficiency is lowered, so there is a problem that an LED having a high color temperature must be used to compensate for the white light.
  • An object of the present invention is to provide an optical sheet capable of increasing the color temperature by converting the color coordinates of incident light.
  • the base layer A first diffusion layer disposed on one surface of the base layer; And a second diffusion layer disposed on the other surface of the base layer, wherein the first diffusion layer or the second diffusion layer includes a light absorbing agent that absorbs light of a predetermined wavelength band.
  • the optical sheet may convert color coordinates of incident light.
  • the y coordinate change amount ⁇ y of the converted color coordinates may be -0.010 to -0.0030.
  • Luminance of the light emitted from the optical sheet may satisfy 96% to 100% based on 100% of the luminance of the light incident on the optical sheet.
  • the light absorbing agent may have an absorption peak in the wavelength range of 580nm to 650nm.
  • the light absorbing agent may be included in 0.0005wt% to 0.006wt%.
  • the light absorbing agent may be included in 0.0005wt% to 0.0015wt%.
  • a display device having any one of the above-described optical sheet; And a display panel for generating an image using the light whose color coordinate is converted by the optical sheet.
  • the color temperature can be increased by converting the color coordinates of the light provided by the backlight unit. Therefore, it is possible to use an LED grade with low brightness, thereby reducing the manufacturing cost.
  • FIG. 1 is a conceptual diagram of a diffusion sheet according to an embodiment of the present invention
  • FIG. 2 is a view for explaining a state in which the color coordinates change by the diffusion sheet according to an embodiment of the present invention
  • Figure 3 is a graph measuring the change in transmittance according to the content of the light absorber
  • Figure 4 is a graph measuring the change in brightness and color coordinates according to the content of the light absorber
  • FIG. 5 is a conceptual diagram of a diffusion sheet according to another embodiment
  • FIG. 9 is a conceptual diagram of a display apparatus according to an exemplary embodiment.
  • ordinal numbers such as second and first
  • first and second components may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.
  • FIG. 1 is a conceptual diagram of a diffusion sheet according to an embodiment of the present invention
  • Figure 2 is a view for explaining a state in which the color coordinates change by the diffusion sheet according to an embodiment of the present invention.
  • the optical sheet 12 includes a base layer 121, a first diffusion layer 122 disposed on one surface of the base layer 121, and a base layer 121. It includes a second diffusion layer 123 disposed on the other side of the.
  • the optical sheet 12 described in this embodiment may be a diffusion sheet.
  • the base layer 121 may be various kinds of polymer films.
  • the base layer 121 is a light transmissive polyethylene terephthalate film, a polycarbonate film, a polypropylene film. It may be any one of polyethylene films.
  • the thickness of the base layer 121 may be 10 ⁇ m to 100 ⁇ m, but is not limited thereto.
  • the first diffusion layer 122 may be disposed on one surface of the base layer 121.
  • the first diffusion layer 122 includes a first resin layer 122a and a light absorbing agent P dispersed in the first resin layer 122a. If necessary, it may further include particles for inducing diffusion (bead particles, etc.).
  • the thickness of the first diffusion layer 122 may be about 5 ⁇ m to 10 ⁇ m, but is not limited thereto.
  • the first resin layer 122a may be prepared by applying a polymer resin to the base layer 121 and then curing it.
  • the polymer resin is any one selected from acrylic resin, urethane resin, polyethylene resin, polypropylene resin, polystyrene resin, polyamide resin, and the like. The above may be, but is not limited thereto.
  • the first diffusion layer 122 may have a diffusion pattern having a shape for diffusing incident light, such as a lens pattern and a semi-circular pillar pattern.
  • This diffusion pattern may be formed regularly or irregularly. There is no restriction on the shape of the diffusion pattern.
  • the diffusion function may be provided using bead particles or the like without such a diffusion pattern.
  • the second diffusion layer 123 is disposed on the other surface of the base layer 121.
  • the second diffusion layer 122 may include a second resin layer 123a and a light absorbing agent P.
  • the structure of the second diffusion layer 123 may be the same as that of the first diffusion layer 122.
  • the first diffusion layer 122 or the second diffusion layer 123 includes a light absorbing agent (P).
  • the light absorbing agent P absorbs light of a predetermined wavelength band.
  • Light absorbing agent (P) may have an absorption peak in the wavelength range of 580nm to 650nm.
  • the light absorbing agent P may be dispersed in any one or more layers of the first diffusion layer 122 or the second diffusion layer 123.
  • the light absorption rate may be increased as compared with the case where the light absorbing agent P is dispersed in only one layer.
  • the light absorbing agent P may be a die or a particle that absorbs light of a predetermined wavelength band.
  • the color coordinates of light emitted from the optical sheet 12 according to the present invention may be different from the color coordinates of light incident to the optical sheet 12 (hereinafter referred to as light L1). have.
  • the color temperature of the outgoing light L2 may be higher than the incident light L1.
  • the color temperature may be relatively low.
  • light is absorbed in the wavelength range of 580nm to 650nm may change the color coordinates and increase the color temperature. That is, the emitted light L2 may be converted into relatively blue white light, thereby increasing the color temperature.
  • Figure 3 is a graph measuring the change in transmittance according to the content of the light absorber
  • Figure 4 is a graph measuring the change in luminance and color coordinates according to the content of the light absorber.
  • the optical sheet does not have a light absorbing agent (Base polymer)
  • the transmittance of the entire visible light wavelength band exceeds 90%.
  • the transmittance of the emitted light is relatively yellow because the transmittance of the wavelength range of 580nm to 650nm is relatively high.
  • the emitted light becomes blue and the light efficiency may be increased. Therefore, a low rank LED can be used as a light source.
  • the y color coordinate change amount? y is preferably -0.010 to -0.003 based on the y color coordinate of the incident light.
  • white light having a yellow color may be converted into white light having a blue color.
  • the transmittance of the wavelength band of about 580 nm decreases as the content (wt%) of the light absorber increases.
  • the content (wt%) of the light absorbing agent is 0.0007 wt% or less, as shown in FIG. 4, the y-coordinate change amount ( ⁇ y) is -0.
  • ⁇ y y-coordinate change amount
  • the half peak width (FWHM) of the absorption peak is preferably 60 nm or less. If the full width at half maximum exceeds 60 nm, the transmittance of adjacent wavelengths decreases, resulting in a large loss of color coordinates and luminance. That is, in order to effectively remove only the wavelength band corresponding to yellow, the half width of the absorption curve of the light absorbing agent P may be adjusted to 60 nm or less.
  • the luminance of the emitted light is preferably controlled to 95% to 100% based on 100% of the incident light. Therefore, the light absorbing agent (P) is preferably 0.0007 wt% to 0.002 wt%.
  • the content of the light absorbing agent (P) is preferably 0.0007 wt% to 0.002 wt% with respect to the weight of the polymer resin constituting the absorbing layer.
  • FIG. 5 is a conceptual diagram of a diffusion sheet according to another embodiment
  • FIG. 6 is a graph of luminance measured by varying the surface roughness of the upper diffusion layer and the lower diffusion layer of the diffusion sheet
  • FIG. 7 is an absorbent of the upper diffusion layer and the lower diffusion layer of the diffusion sheet.
  • the luminance is measured by controlling the concentration differently
  • FIG. 8 is a graph measuring luminance by controlling the thicknesses of the upper diffusion layer and the lower diffusion layer of the diffusion sheet differently.
  • surface roughnesses of the first diffusion layer 122 and the second diffusion layer 123 may be different from each other.
  • the surface roughness may be defined as an average value of mountains and valleys formed on the surfaces of the first and second diffusion layers 122 and 123.
  • the concentrations of the light absorbers dispersed in the first and second diffusion layers 122 and 123 may be different from each other, and the thicknesses of the first and second diffusion layers 122 and 123 may also be different from each other. Can be.
  • the second diffusion layer 123 into which the light L1 emitted from the light source is incident is defined as a lower layer and the first diffusion layer 122 is defined as an upper layer.
  • Experimental Example 1 controlled the surface roughness of the diffusion layers on both sides to 1.2 ⁇ m and measured luminance.
  • Experimental Example 2 controlled the surface roughness in the same manner as Experimental Example 1 and added a light absorber.
  • Experimental Example 2 can be seen that the luminance is reduced by about 5% compared to Experimental Example 1. That is, it can be seen that the brightness decreases when the light absorber is added under the same conditions.
  • Experimental Example 5 in which the surface roughness of the upper layer was set to 1.2 ⁇ m and the surface roughness of the lower layer was controlled to 0.9 ⁇ m increased in brightness than that of Experimental Example 2.
  • Experimental Example 6 in which the surface roughness of the upper layer was set to 0.9 ⁇ m and the surface roughness of the lower layer was controlled to 1.2 ⁇ m, it can be seen that the luminance rise is relatively small.
  • Experimental Example 8 based on 100% of the brightness of Experimental Example 7 without adding the light absorbing agent, Experimental Example 8 having 0.002pt of light absorbing agent dispersed in each of the upper and lower layers measured 96.8% of brightness.
  • Experimental Example 10 in which a light absorber of 0.004 pt was dispersed only in the upper layer had a luminance of 96.6%.
  • FIG. 9 is a conceptual diagram of a display apparatus according to an exemplary embodiment.
  • a display apparatus includes a backlight unit 10 and a display panel 20.
  • the display panel 20 implements an image by adjusting the amount of light transmitted from the backlight unit 10.
  • the display panel 20 may be a liquid crystal panel.
  • the display panel 20 includes a TFT substrate 22, a color filter 14, and a liquid crystal 23 filled between the TFT substrate 22 and the color filter 24.
  • polarizers may be further disposed on the upper and lower surfaces of the display panel 20. Therefore, the amount of light can be adjusted by modifying the arrangement direction of the liquid crystal by adjusting the voltage applied to the liquid crystal 23.
  • the backlight unit 10 reflects the plurality of light sources 16 and the light guide plate 11 that converts the light emitted from the light source 16 into the surface light source, and the light emitted from the light guide plate 11 toward the display panel 20.
  • the plurality of optical sheets may be a diffusion sheet 12 and a pair of prism sheets 13 and 14.
  • the above-described configuration of the diffusion sheet 12 and the reflection sheet 15 may be applied as it is. Accordingly, the light emitted from the light source 16 may be converted into color coordinates by the diffusion sheet 12 and the reflection sheet 15 and provided to the liquid crystal panel. Thus, the light source 16 can be replaced with a relatively low LED rating.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne une feuille optique et un dispositif d'affichage comprenant celle-ci, la feuille optique comprenant une couche de base, une première couche de diffusion disposée sur un côté de la couche de base, et une seconde couche de diffusion disposée sur l'autre côté de la couche de base, la première couche de diffusion ou la seconde couche de diffusion comprenant un absorbant de lumière qui absorbe la lumière d'une bande de longueur d'onde prédéterminée.
PCT/KR2017/007071 2016-07-08 2017-07-04 Feuille optique, unité de rétroéclairage et dispositif d'affichage les comprenant WO2018008938A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2016-0086825 2016-07-08
KR1020160086825A KR101933141B1 (ko) 2016-07-08 2016-07-08 광학시트, 백라이트 유닛, 및 이를 포함하는 디스플레이 장치

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WO2018008938A1 true WO2018008938A1 (fr) 2018-01-11

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KR102339785B1 (ko) * 2020-12-07 2021-12-15 에스케이씨하이테크앤마케팅(주) 광학 시트 및 이를 포함하는 표시 장치

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080103693A (ko) * 2007-05-25 2008-11-28 엘지디스플레이 주식회사 백라이트 유닛
KR20080110357A (ko) * 2007-06-15 2008-12-18 미래나노텍(주) 색 보정기능을 갖는 광학시트
KR20100070469A (ko) * 2008-12-18 2010-06-28 에스에스씨피 주식회사 자외선 경화형 복합필름 조성물 및 이를 이용한 필름
KR20110119036A (ko) * 2010-04-26 2011-11-02 엘지디스플레이 주식회사 확산 시트와 이를 포함하는 액정 표시장치의 백라이트 유닛
JP2015072381A (ja) * 2013-10-03 2015-04-16 恵和株式会社 光拡散シート及び液晶表示装置用のバックライトユニット

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080103693A (ko) * 2007-05-25 2008-11-28 엘지디스플레이 주식회사 백라이트 유닛
KR20080110357A (ko) * 2007-06-15 2008-12-18 미래나노텍(주) 색 보정기능을 갖는 광학시트
KR20100070469A (ko) * 2008-12-18 2010-06-28 에스에스씨피 주식회사 자외선 경화형 복합필름 조성물 및 이를 이용한 필름
KR20110119036A (ko) * 2010-04-26 2011-11-02 엘지디스플레이 주식회사 확산 시트와 이를 포함하는 액정 표시장치의 백라이트 유닛
JP2015072381A (ja) * 2013-10-03 2015-04-16 恵和株式会社 光拡散シート及び液晶表示装置用のバックライトユニット

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KR101933141B1 (ko) 2018-12-27
KR20180006121A (ko) 2018-01-17

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