WO2023003207A1 - Plaque de guidage de lumière utilisant un motif de groupement et dispositif d'affichage la comprenant - Google Patents

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

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Publication number
WO2023003207A1
WO2023003207A1 PCT/KR2022/009399 KR2022009399W WO2023003207A1 WO 2023003207 A1 WO2023003207 A1 WO 2023003207A1 KR 2022009399 W KR2022009399 W KR 2022009399W WO 2023003207 A1 WO2023003207 A1 WO 2023003207A1
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WO
WIPO (PCT)
Prior art keywords
group
pattern
guide plate
light guide
patterns
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Application number
PCT/KR2022/009399
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English (en)
Korean (ko)
Inventor
류충엽
최호범
이승근
유래완
송현근
이경태
Original Assignee
주식회사 에이치비테크놀러지
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Publication of WO2023003207A1 publication Critical patent/WO2023003207A1/fr

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    • 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
    • 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
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides

Definitions

  • the present invention relates to a light guide plate using a grouping pattern and a display device including the same, and more particularly, to a technique for minimizing the visibility of defects in the light guide plate to the human eye.
  • 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 Republic of Korea Patent Registration No. 10-1158524 (2012.06.21.)
  • the present invention can provide a light guide plate using a grouping 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 light guide plate using a grouping pattern includes a plurality of dot patterns for dispersing light sources on one side of the light guide plate, wherein a plurality of the dot patterns are densely clustered to form a group pattern, and the group pattern is formed on a light incident surface.
  • a plurality of groups are formed in the transverse and longitudinal directions based on, and the plurality of group patterns are formed at equal intervals in the transverse and longitudinal directions, and at least one of a precise array formed at regular intervals and a random array formed at random intervals.
  • At least one of the dot pattern and the group pattern may be provided by changing the distribution density for each position.
  • the group pattern may be formed in a zigzag pattern in a transverse direction based on the side surface.
  • the group patterns may be arranged at different intervals between at least one pair of group patterns in the longitudinal direction.
  • a display device including the light guide plate may be provided.
  • the present invention by adjusting the pattern formed on the light guide plate, it is possible to provide a uniform and high-quality appearance to the liquid crystal screen by minimizing non-uniform light viewing caused by defects in the light guide plate.
  • FIG. 1 is a configuration diagram illustrating a light guide plate using a grouping pattern according to an exemplary embodiment.
  • FIG. 2 is a schematic diagram illustrating dispersion of light according to grouped patterns according to an exemplary embodiment.
  • FIG. 3 is a detailed schematic diagram of a light guide plate showing precision arrangement according to an exemplary embodiment.
  • FIG. 4 is a detailed schematic diagram of a light guide plate showing a random arrangement according to an exemplary embodiment.
  • FIG. 5 is a detailed schematic view of a light guide plate showing precise arrangement and random arrangement according to an embodiment.
  • FIG. 6 is a diagram illustrating an external state of a light guide plate to which a group pattern arrangement structure according to an exemplary embodiment is applied.
  • FIG. 1 is a configuration diagram illustrating a light guide plate using a grouping pattern according to an exemplary embodiment.
  • a light guide plate using a grouping pattern includes a plurality of dot patterns 10 dispersing light sources 30 on one side of the light guide plate 100, but the dot patterns 10 are A plurality of group patterns 20 are formed by densely forming a plurality of group patterns 20 in the transverse and longitudinal directions based on the light incident surface, and the plurality of group patterns 20 are formed in the transverse and longitudinal directions It may be provided with at least one arrangement of a precise arrangement formed at equal intervals and a random arrangement formed at random intervals.
  • At least one of the dot pattern 10 and the group pattern 20 may be provided by changing the distribution density for each position, and the group pattern 20 may be formed in a zigzag pattern in the transverse direction based on the side surface,
  • the group patterns may be disposed differently from each other at mutual intervals between at least one pair of group patterns in the longitudinal direction. That is, at least one pair of group patterns among each of the group patterns formed in the longitudinal direction with respect to the light source may have different intervals.
  • the group pattern 20 may be arranged at a predetermined angle so as to secure an optical path with respect to the plane on which the light source 30 is incident.
  • the dot pattern 10 may be provided in various forms to disperse the light source 30 incident from the side to the front, and is formed by a printing method, an injection method, an imprinting method, a laser processing method, a V-cutting method, or a stamp method. However, it is not necessarily limited to the above method.
  • the dot pattern 10 may be changed in any one of a triangular, square, bar, elliptical, circular, donut, cylindrical, curved, and oblique shape, but the dot pattern 10
  • the form is not necessarily limited to the above-mentioned form.
  • the shape of the dot pattern 10 can be changed as needed, and methods for changing the shape include mechanical processing, laser processing, sanding processing, injection molding, press molding, extrusion molding, stamp molding, pressure molding, and water jet molding methods. It is not necessarily limited to the above-mentioned shape change method.
  • the group pattern 20 in which the dot patterns 10 are densely packed may be transformed into a square, a rhombus, a circle, an ellipse, a triangle, or a bar shape according to the arrangement of the dot patterns 10, but it is necessarily limited to the above-described shapes. it is not going to be
  • 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 formed of plastic or resin.
  • the key to the light guide plate 100 is to receive light from the side and emit light to the front to uniformly distribute the light over the entire area. If light is directly emitted from a general surface light emitting or surface light source, it is highly likely to be recognized as defects (A1) and scratches (A2) due to impurities generated during the process due to the straightness of light, so these defects (A1) and scratches ( A dot pattern 10 may be formed on the bottom surface of the light guide plate 100 to disperse the light source 30 in order to lower the visibility of A2).
  • the light source 30 of FIGS. 1 to 5 shows the position of the light source 30 arranged at the X-Pitch to explain one embodiment, but the position of the light source is not limited to one embodiment. That is, the light source 30 is not necessarily arranged limited to the X-Pitch.
  • the light source 30 may be disposed at at least one of an X-Pitch and a Y-Pitch. This enables the amount of light emitted from the light guide plate to be adjusted to the front surface according to the number and position of the light sources 30 located on each side.
  • the formed dot pattern 10 may be formed in a size of 30 to 70 ⁇ m, and serves to refract the light source 30 incident from the side and disperse it in various angles.
  • the refracted light source 30 moves to the side of the light guide plate 100. It is likely to be released and act as a loss.
  • the direction of refraction of the light source 30 when emitting from a dense medium to a sparse medium and the direction of refraction when emitting from a dense medium to a sparse medium are different.
  • the distributed dot pattern 10 is not emitted when the light source 30 advances at a specific angle and reaches the front surface, and is totally reflected, which may lead to light loss.
  • the light after the critical angle does not refract or transmit, but causes total reflection, resulting in disappearance inside the light guide plate 100.
  • the light sources 30 can be emitted at various angles.
  • FIG. 2 is a schematic diagram illustrating dispersion of light according to grouped patterns according to an exemplary embodiment.
  • Table 1 shows the visibility of the defect A1 according to adjusting the density of the dot pattern 10. As shown in Table 1, it can be confirmed that as the density of the dot pattern 10 increases, the degree of visibility of defects A1 and scratches A2 generated during the process decreases.
  • the number of patterns is the number of dense dot patterns 10.
  • the number of patterns increases, an inverse relationship in which the number of defects (A1) decreases appears, and from 8 or more grouped patterns, it can be seen that the number of defects (A1), which was 5, appears to be 2 or less.
  • the number of defects (A1) is lowered to 2 or less, good quality conditions can be satisfied.
  • the plurality of dot patterns 10 in each group pattern 20 may be formed at regular or random intervals. As shown in FIG. 7, the visibility of the defect A1 may vary according to the shape of each group pattern 20.
  • the probability of light emitted from the light source 30 escaping to the front increases as the number of patterns of the group patterns 20 increases. This means that the degree of brightness per group pattern 20 increases, and conversely, the degree of visibility of the defect A1 may decrease.
  • the group pattern 8 is a bar-shaped dot pattern 10 densely packed, and it can be seen that the light efficiency of 102.1% exceeds the light efficiency of 100% of the existing pattern.
  • the arrangement structure is a group pattern ( 20) can be spaced apart at regular intervals, and the appearance state can be confirmed by changing the shape of the arrangement.
  • the appearance state may appear as light spreading or light bias due to dispersion of light, and in some cases, a Moire phenomenon may appear.
  • This phenomenon is caused by the difference between the area where the light sources 30 scattered in the group pattern 20 reach the front and the area where the overlapping light sources 30 are relatively large and small, and the difference between the group pattern 20 or the dot pattern 10. Even a regular arrangement or the like can cause problems.
  • the problem of appearance can be solved by changing and applying the arrangement structure of the group pattern 20 for each row direction. That is, when the plurality of dot patterns 10 are arranged in a specific arrangement structure in a row direction, light distribution according to the arrangement structure of the group patterns 20 can be confirmed by the light sources 30 reaching the front surface.
  • 3 and 4 are detailed schematic diagrams of a light guide plate showing arrangement structures of precision arrangement and random arrangement according to an embodiment.
  • the arrangement structure of the group patterns 20 may include at least one of a precise arrangement and a random arrangement.
  • the group patterns 20 may be formed at regular intervals, and in the random arrangement, the group patterns 20 may be formed at random intervals.
  • the group patterns 20 arranged in precise arrangement it refers to an arrangement designed at equal intervals in at least one direction of X-pitch and Y-pitch, and patterns are formed according to regular intervals to confirm stable light distribution.
  • the moiré phenomenon may appear conspicuously. As shown in Table 3, by randomly arranging X-pitch or Y-pitch array intervals in a precise array structure, it is possible to minimize and solve the moiré phenomenon.
  • the degree of dispersion of the light source 30 is not constant compared to the case where the spacing between the group patterns 20 is constant, so a moiré phenomenon that may occur in a structure having a uniform pattern density. problems can be minimized.
  • precise array and random array can be arranged at the same time. If the precise array and the random array are arranged at the same time, the above-described problems of the precise array and the random array can be supplemented at the same time. However, in order to solve the above-mentioned problem, it is not necessarily necessary to apply precise array and random array at the same time.
  • Precise arrangement and random arrangement represent arrangement methods according to respective embodiments, and it should be recognized that the light guide plate 100 using only precision arrangement and the light guide plate 100 using only random arrangement may be used in some cases.
  • FIG. 5 is a detailed schematic view of a light guide plate in which precision arrangement and random arrangement are arranged according to an embodiment.
  • a group pattern 20 is disposed by grouping the first row and the second row into a first row group 41 .
  • the group patterns 20 of the first row arranged horizontally with respect to the Y-pitch are arranged at regular intervals, and the group patterns 20 of the second row are a pair of group patterns of the first row ( 20)
  • the group patterns 20 of the first row and the second row may be arranged in a zigzag form by being arranged between positions.
  • the third row and the fourth row may also be grouped into the second row group 42, and the group patterns 20 may be arranged at regular intervals in a precise arrangement.
  • the group pattern 20 of the third row may be disposed between the pair of group patterns 20 of the second row, and the group pattern 20 of the fourth row may be disposed between the pair of group patterns 20 of the third row. (20) may be arranged in a zigzag form.
  • first row group 41 that binds the first row and the second row and the second row group 42 that binds the third row and fourth row are precision arrangements for each row group 40
  • Groups 40 may be arranged randomly.
  • the precise array and the random array may be applied and provided to each row group.
  • the above-described precision arrangement and random arrangement are for explanation of an embodiment and are not necessarily limited to the first row group and the second row group.
  • the position of the group pattern 20 may be randomly formed with respect to the X-pitch. This can minimize the moiré phenomenon as the position of the group pattern 20 is finely changed. That is, as described above, at least one of each of the group patterns formed in the longitudinal direction with respect to the light source may have a different arrangement interval.
  • the random ratio of the group patterns 20 may be desirable to limit the random ratio of the group patterns 20 to which positions are randomly applied to 50% or less in an arrangement method in which precise arrangement and random arrangement are simultaneously applied.
  • the random ratio may vary depending on the number of group patterns 20 and the X-pitch and Y-pitch distances, and the positional arrangement of the group patterns 20 is random only for the arrangement method in which both precise and random arrangements are simultaneously applied. does not apply
  • the group pattern 20 may be formed to form a predetermined angle with respect to the surface on which the light source is incident based on the surface on which the dot pattern 10 is formed.
  • the group pattern 20 when the group pattern 20 is formed in a bar shape, there is a possibility that the group pattern 20 that is far from the light source 30 may pass due to the straightness of the light. In this case, the light source 30 may be lost.
  • the arrangement of the group patterns 20 is formed to form a predetermined angle with respect to the rate of change of Y-pitch based on the X-pitch or formed to form a predetermined angle with respect to the rate of change of X-pitch based on the Y-ptich As the light path is further secured, light can be dispersed even to the group pattern 20 far from the light source 30 .
  • a display device including a light guide plate having the above characteristics can be manufactured, and specific components of the display device are not limited.
  • FIG. 6 is a diagram illustrating an external state of a light guide plate to which a group pattern arrangement structure according to an exemplary embodiment is applied.
  • the group patterns 20 of (b) are more precisely arranged than when the general pattern of (a) is applied. It can be confirmed that the defect A1 and the scratch A2 disappeared due to the dispersion of the light source 30 according to the application of any one arrangement structure among random arrangement and random arrangement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne une plaque de guidage de lumière utilisant un motif de groupement et un dispositif d'affichage la comprenant : la plaque de guidage de lumière ayant une pluralité de motifs de points disposés sur une surface de celle-ci, pour diffuser une source de lumière ; la pluralité de motifs de points étant groupés pour former un motif de groupe ; le motif de groupe étant disposé dans une pluralité dans les directions horizontale et verticale par rapport à la surface d'incidence de lumière ; et la pluralité de motifs de groupe étant agencés dans au moins l'un d'un réseau de précision, dans lequel les motifs de groupe sont espacés régulièrement dans la direction horizontale et dans la direction verticale, et un réseau aléatoire, dans lequel les motifs de groupe sont espacés de manière aléatoire, de telle sorte que la visibilité des défauts dus aux impuretés est réduite au minimum, donnant un aspect uniforme et de qualité élevée à un affichage à cristaux liquides, et des défauts pendant la production en masse de grandes plaques de guidage de lumière sont réduits au minimum, ce qui permet d'améliorer la qualité et la productivité d'un dispositif d'affichage.
PCT/KR2022/009399 2021-07-19 2022-06-30 Plaque de guidage de lumière utilisant un motif de groupement et dispositif d'affichage la comprenant WO2023003207A1 (fr)

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KR1020210094219A KR20230013448A (ko) 2021-07-19 2021-07-19 그룹화 패턴을 이용한 도광판 및 이를 포함하는 디스플레이 장치
KR10-2021-0094219 2021-07-19

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080006311A (ko) * 2006-07-12 2008-01-16 최우근 도광판 및 이를 갖는 백라이트 어셈블리
KR20110071993A (ko) * 2009-12-22 2011-06-29 엘지디스플레이 주식회사 도광판과 이를 이용한 백라이트 유닛
JP5460893B2 (ja) * 2011-02-15 2014-04-02 三菱電機株式会社 角度強度分布整形部材及び面光源装置
KR20160022224A (ko) * 2014-08-18 2016-02-29 (주)뉴옵틱스 도광판 및 이를 포함하는 백라이트 유닛
US20180203177A1 (en) * 2017-01-13 2018-07-19 Samsung Display Co., Ltd. Light guide plate of backlight unit and liquid crystal display device including the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080006311A (ko) * 2006-07-12 2008-01-16 최우근 도광판 및 이를 갖는 백라이트 어셈블리
KR20110071993A (ko) * 2009-12-22 2011-06-29 엘지디스플레이 주식회사 도광판과 이를 이용한 백라이트 유닛
JP5460893B2 (ja) * 2011-02-15 2014-04-02 三菱電機株式会社 角度強度分布整形部材及び面光源装置
KR20160022224A (ko) * 2014-08-18 2016-02-29 (주)뉴옵틱스 도광판 및 이를 포함하는 백라이트 유닛
US20180203177A1 (en) * 2017-01-13 2018-07-19 Samsung Display Co., Ltd. Light guide plate of backlight unit and liquid crystal display device including the same

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