WO2023106775A1 - Plaque de guidage de lumière utilisant un motif hybride et dispositif d'affichage la comprenant - Google Patents

Plaque de guidage de lumière utilisant un motif hybride et dispositif d'affichage la comprenant Download PDF

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Publication number
WO2023106775A1
WO2023106775A1 PCT/KR2022/019646 KR2022019646W WO2023106775A1 WO 2023106775 A1 WO2023106775 A1 WO 2023106775A1 KR 2022019646 W KR2022019646 W KR 2022019646W WO 2023106775 A1 WO2023106775 A1 WO 2023106775A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
dot
dots
Prior art date
Application number
PCT/KR2022/019646
Other languages
English (en)
Korean (ko)
Inventor
류충엽
최호범
이승근
유래완
송현근
이경태
Original Assignee
주식회사 에이치비테크놀러지
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.)
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Application filed by 주식회사 에이치비테크놀러지 filed Critical 주식회사 에이치비테크놀러지
Publication of WO2023106775A1 publication Critical patent/WO2023106775A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

Definitions

  • the present invention relates to a light guide plate using a hybrid pattern and a display device including the same, and more particularly, to a technique for minimizing visibility of defects in the light guide plate by increasing light dispersion.
  • a liquid crystal display is one of the most widely used flat panel displays (FPD), and consists of two substrates on which electrodes are formed and a liquid crystal layer inserted therebetween. It is a device that displays an image by adjusting the amount of transmitted light by rearranging the liquid crystal molecules of the liquid crystal layer by applying a .
  • a display such as a liquid crystal display (LCD) uses a two-dimensional light source that transmits light emitted from a one-dimensional light source to a light guide plate and then transmits through one surface thereof.
  • the efficiency of the surface light source is the overall efficiency of the display device. It is emerging as an important factor in determining performance.
  • the efficiency of light in a conventional liquid crystal display (LCD) is about 3 to 10%, and light loss mainly occurs in a light guide plate, a polarizer, and a color filter.
  • the size of the pattern is formed very finely in preparation for defects, and the vulnerability of the light guide plate to defects has increased.
  • the visibility of such excessive defects may increase the defect rate of the light guide plate, reduce the efficiency of the assembly process, and deteriorate the image quality of the display.
  • a conventional backlight device may include a light guide plate, a reflective sheet installed under the light guide plate, a QD sheet installed above the light guide plate, a diffusion sheet, a prism sheet, a DBED sheet, and a light source installed on one side of the light guide plate.
  • the light guide plate is made of PMMA (Poly Methylmethacrylate), MS (Methylmethacrlate Styrens), PS (Poly Styrene), PC (Poly Carbonate), PET (polyethylene terephthalate), etc. It can be made of the same plastic or resin.
  • the light guide plate includes a pattern of a predetermined shape on one side of the inside.
  • a plurality of circular, elliptical, and vertical bar patterns are formed at regular or random intervals in the horizontal and vertical directions of light emitted from an external light source.
  • the light emitted from the external light source After the light emitted from the external light source is incident on the light guide plate, a part of it is emitted to the outside of the light guide plate by the pattern, but some defects play a role similar to the pattern and are likewise emitted to the outside. A part of the light emitted by the defect is emitted as light having a higher intensity than the pattern, so that a light non-uniformity region that is noticeable in a backlight requiring a uniform surface light source as a whole can be visually recognized.
  • the prior art has a problem in that a partial area of the liquid crystal screen is brightened due to a non-uniformity phenomenon generated from the defect, so that the overall appearance is not uniform.
  • Patent Document 1 Korea Patent Registration No. 10-1158524 (2012.06.21)
  • the present invention can provide a light guide plate using a hybrid pattern capable of minimizing non-uniform visibility formed as defects by densely controlling existing patterns formed on the light guide plate and a display device including the same.
  • a dot pattern for dispersing light incident from a light incident surface on a side surface to the front surface is densely formed in a predetermined number on a surface facing the front surface, and the light incident surface a plurality of dot groups provided in any one of a precise arrangement having the same spacing in the horizontal and vertical directions and a random arrangement in which the spacing is random; and light dispersion dots provided between the spaced apart spaces of the dot groups to multi-directionally disperse light sources incident between the respective dot groups.
  • the light dispersion dots may be equally spaced in one direction.
  • the light dispersion dots may be formed at random positions.
  • the light dispersion dots are collinear in one direction, but spaced apart from each other may be randomly formed.
  • the light dispersion dots may be zigzag with each other in one direction.
  • the light dispersion dots may disperse the incident light source at a wider angle than the dot pattern.
  • the dot groups and light dispersion dots may be formed by any one of a printing technique, an injection technique, an imprinting technique, a laser processing technique, a V-cutting technique, and a stamp technique.
  • the dot groups and the light dispersion dots may be formed in any one of a polygonal shape, a circular shape, and an elliptical shape.
  • the distribution density of the light dispersion dots may be changed in each direction.
  • it may be a display device including a light guide plate using a hybrid pattern.
  • the light can reach the liquid crystal screen uniformly, and the quality and productivity of the display can be improved by minimizing defects in mass production of the large light guide plate.
  • FIG. 1 is a configuration diagram illustrating a light guide plate using a hybrid pattern according to an exemplary embodiment.
  • FIG. 2 is a diagram schematically illustrating a light dispersion principle according to an exemplary embodiment.
  • FIG 3 is a first cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
  • FIG. 4 is a second cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
  • FIG. 5 is a third cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
  • FIG. 6 is a first cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
  • FIG. 7 is a second cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
  • FIG. 8 is a third cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
  • FIG. 9 is a first cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
  • FIG. 10 is a second cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
  • FIG. 11 is a third cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
  • FIG. 12 is a diagram illustrating an appearance state of a light guide plate to which an arrangement of dot groups and light dispersion dots according to an exemplary embodiment is applied.
  • FIG. 1 is a configuration diagram illustrating a light guide plate using a hybrid pattern according to an exemplary embodiment.
  • a light guide plate 100 using a hybrid pattern may include a dot group 20 and light dispersion dots 30 .
  • the dot group 20 may be formed by densely concentrating a predetermined number of dot patterns 10 on a surface facing the front surface to disperse the light source 40 incident from the light incident surface on the side to the front surface.
  • the light dispersion dots 30 are provided between the spaced apart spaces of the dot groups 20 and can disperse the light sources 40 incident between the respective dot groups 20 in multiple directions.
  • the light dispersion dots may be spaced at equal intervals in one direction, may be formed at random positions, and may be formed on the same line in one direction but at random intervals.
  • the light dispersion dots 30 may be zigzag with each other in one direction.
  • the light dispersion dots 30 can disperse the incident light source 40 at a wider angle than the dot pattern 10, and the distribution density of the light dispersion dots 30 can be changed in each direction.
  • the dot group 20 and the light dispersion dots 30 may be formed by any one of a printing technique, an injection technique, an imprinting technique, a laser processing technique, a V-cutting technique, and a stamp technique, and the dot group 20 And the light dispersion dots 30 may be formed in any one of polygonal, circular, and elliptical shapes, but each dot group 20 and the light dispersion dots 30 are not necessarily limited to the above-described technique and shape.
  • a display device including the light guide plate 100 having the aforementioned characteristics may be manufactured, and specific components of the display device are not limited.
  • FIG. 2 is a diagram schematically illustrating a light dispersion principle according to an exemplary embodiment.
  • the light source 40 incident from the side is the light source 40 incident by the dot pattern 10 provided on one side of the light guide plate 100.
  • the degree of dispersion of the light source 40 increases proportionally as the density of the dot pattern 10 increases, the amount of light emitted to the front portion where the dot group 20 in which the dot pattern 10 is densely located increases. .
  • the amount of light emitted from the light source 40 may decrease by the distance between the dot groups 20 .
  • 3 to 5 are cross-sectional views illustrating the light dispersion dots 30 arranged by arrangement in the light guide plate 100 in which the dot groups 20 are precisely arranged according to an exemplary embodiment.
  • FIG 3 is a first cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
  • the dot groups 20 are equally spaced apart, but the light source 40 is incident on the surface.
  • potting soil groups provided at equal intervals in each longitudinal direction may be provided in a zigzag form.
  • the light dispersion dots 30 may be provided at equal intervals between each dot group 20 provided in the longitudinal direction.
  • the spaced intervals of the light dispersion dots 30 may be changed, and even if they are provided with a change, they may be equally spaced.
  • the light guide plate 100 in which the dot groups 20 are precisely arranged according to an embodiment between the dot groups 20 provided at equal intervals in each longitudinal direction based on the surface on which the light source 40 is incident, The light dispersion dots 30 are provided, but are not limited thereto, and the light dispersion dots 30 may be provided between spaced apart spaces of each dot group 20 .
  • FIG. 4 is a second cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
  • the dot groups 20 are equally spaced apart, and the light dispersion dots 30 are each dot. It may be provided at random intervals between the groups 20 .
  • FIG. 5 is a third cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
  • the dot groups 20 are equally spaced apart, and the light dispersion dots 30 are arranged in the vertical direction. It is provided on the same line between each dot group 20 provided, but the spacing may be provided in a random form.
  • the random spacing of the light dispersion dots 30 may be randomly adjusted after a predetermined number of patterns.
  • the number of light dispersion dots 30 provided on the same line in the horizontal direction based on the light incident surface, but provided at random intervals, is set to determine the spacing between the light dispersion dots 30 provided in each horizontal direction. can be set
  • 6 to 8 are cross-sectional views of each arrangement of the light dispersion dots 30 in the light guide plate 100 in which the dot groups 20 are randomly arranged according to an exemplary embodiment.
  • FIG. 6 is a first cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
  • the spacing between the respective dot groups 20 may be randomly provided.
  • the light dispersion dots 30 may be provided at equal intervals in each longitudinal direction based on the surface on which the light source 40 is incident. At this time, the light dispersion dots 30 provided on the same line in one direction may be discontinuously arranged by the randomly provided dot groups 20 .
  • FIG. 7 is a second cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
  • the spacing between the respective dot groups 20 is provided at random, and the dot groups 20 are spaced apart at random. Separation intervals of the provided light dispersion dots 30 may be provided randomly.
  • FIG. 8 is a third cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
  • the dot groups 20 may be spaced at random intervals.
  • the light dispersion dots 30 are provided on the same line in the longitudinal direction with respect to the surface on which the light source 40 is incident, and the distances between the light dispersion dots 30 may be randomly provided.
  • the random spacing of the light dispersion dots 30 may be randomly adjusted after a predetermined number of patterns.
  • the number of light dispersion dots 30 provided on the same line in the horizontal direction based on the light incident surface, but provided at random intervals, is set to determine the spacing between the light dispersion dots 30 provided in each horizontal direction. can be set
  • 9 to 11 are cross-sectional views of each arrangement of the light dispersion dots 30 in the light guide plate 100 in which the dot groups 20 are arranged in precise and random arrangements according to an exemplary embodiment.
  • FIG. 9 is a first cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
  • the first and second rows are grouped into a first row group 51 and a third Rows and the fourth row may be grouped into the second row group 52 and the arrangement of the dot groups 20 may be changed for each row group 50 .
  • the third row and fourth row of the second row group 52 may be random arrangements.
  • the precise arrangement of the rows and the second row may be equally spaced, but the arrangement of each row may be zigzag, and the random arrangement of the third and fourth rows may be on the same line with respect to each row or the spacing of the dot groups 20 This may be provided randomly.
  • the light dispersion dots 30 may be provided at regular intervals in one direction between each row and each row group 50 .
  • the light dispersion dots 30 may have a zigzag arrangement of each of the light dispersion dots 30 provided in one direction.
  • FIG. 10 is a second cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
  • each row group 50 is arranged in precise and random arrangements. It is provided in one form, and the light dispersion dots 30 may be randomly provided between or around each row and each row group 50 .
  • FIG. 11 is a third cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
  • each row group 50 is provided in either a precise arrangement or a random arrangement.
  • the light dispersion dots 30 are provided in one direction between each row and each row group 50, and the distance between each light dispersion dot 30 may be provided at random.
  • FIG. 12 is a diagram illustrating an appearance state of a light guide plate to which an arrangement of dot groups and light dispersion dots according to an exemplary embodiment is applied.
  • the appearance state of the light guide plate 100 to which the arrangement of the dot groups 20 and the light dispersion dots 30 according to an embodiment is applied is (a) the light guide plate 100 to which the general dot pattern 10 is applied. ), and (b) shows the light guide plate 100 to which the hybrid pattern is applied.
  • the light guide plate 100 to which the hybrid pattern is applied disperses more light sources 40, it can be seen that the defect A1 and the scratch A2 have disappeared.

Abstract

La présente invention concerne une plaque de guidage de lumière utilisant un motif hybride et un dispositif d'affichage comprenant la plaque de guidage de lumière. La plaque de guidage de lumière comprend : de multiples groupes de points ayant un nombre prédéterminé de motifs de points, qui dispersent une source de lumière incidente à partir d'une surface d'incidence de lumière d'une surface latérale de celle-ci vers la surface avant de celle-ci et sont formés de manière dense sur une surface faisant face à la surface avant ; et des points de dispersion de lumière disposés dans des espaces espacés entre les groupes de points pour disperser la source de lumière incidente sur chacun des espaces entre les groupes de points dans de multiples directions. La plaque de guidage de lumière permet à la lumière d'atteindre uniformément un écran à cristaux liquides, et peut ainsi réduire au minimum les défauts au moment de la production en masse de plaques de guidage de lumière à grande échelle, de façon à améliorer la qualité et la productivité d'affichage.
PCT/KR2022/019646 2021-12-10 2022-12-05 Plaque de guidage de lumière utilisant un motif hybride et dispositif d'affichage la comprenant WO2023106775A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020210177096A KR102643313B1 (ko) 2021-12-10 2021-12-10 하이브리드 패턴을 이용한 도광판 및 이를 포함하는 디스플레이 장치
KR10-2021-0177096 2021-12-10

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WO2023106775A1 true WO2023106775A1 (fr) 2023-06-15

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WO (1) WO2023106775A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080000408A (ko) * 2006-06-27 2008-01-02 엘지.필립스 엘시디 주식회사 백 라이트 어셈블리 및 이를 구비하는 액정표시장치
KR101010984B1 (ko) * 2010-05-10 2011-01-26 레이젠 주식회사 복합 패턴을 갖는 도광판 및 이의 제조방법
JP2012048914A (ja) * 2010-08-25 2012-03-08 Seiko Instruments Inc 照明装置及びこれを用いた液晶表示装置
JP2018156871A (ja) * 2017-03-17 2018-10-04 パナソニックＩｐマネジメント株式会社 導光板および照明装置
JP2019160511A (ja) * 2018-03-12 2019-09-19 パナソニックＩｐマネジメント株式会社 導光板及び照明装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101158524B1 (ko) 2005-07-18 2012-06-21 에스엘 주식회사 산란패턴이 형성된 도광판

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080000408A (ko) * 2006-06-27 2008-01-02 엘지.필립스 엘시디 주식회사 백 라이트 어셈블리 및 이를 구비하는 액정표시장치
KR101010984B1 (ko) * 2010-05-10 2011-01-26 레이젠 주식회사 복합 패턴을 갖는 도광판 및 이의 제조방법
JP2012048914A (ja) * 2010-08-25 2012-03-08 Seiko Instruments Inc 照明装置及びこれを用いた液晶表示装置
JP2018156871A (ja) * 2017-03-17 2018-10-04 パナソニックＩｐマネジメント株式会社 導光板および照明装置
JP2019160511A (ja) * 2018-03-12 2019-09-19 パナソニックＩｐマネジメント株式会社 導光板及び照明装置

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