[go: up one dir, main page]

WO2010005205A2 - High-diffusion condenser sheet and backlight assembly using same - Google Patents

High-diffusion condenser sheet and backlight assembly using same Download PDF

Info

Publication number
WO2010005205A2
WO2010005205A2 PCT/KR2009/003607 KR2009003607W WO2010005205A2 WO 2010005205 A2 WO2010005205 A2 WO 2010005205A2 KR 2009003607 W KR2009003607 W KR 2009003607W WO 2010005205 A2 WO2010005205 A2 WO 2010005205A2
Authority
WO
WIPO (PCT)
Prior art keywords
light
diffusion
sheet
base layer
condensing lens
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2009/003607
Other languages
French (fr)
Korean (ko)
Other versions
WO2010005205A3 (en
Inventor
백승철
김경태
김병묵
이수정
최미정
전진혁
국민철
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Doosan Corp
Original Assignee
Doosan Corp
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 Doosan Corp filed Critical Doosan Corp
Publication of WO2010005205A2 publication Critical patent/WO2010005205A2/en
Publication of WO2010005205A3 publication Critical patent/WO2010005205A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • G02B5/0221—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 the surface having an irregular structure
    • 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
    • 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
    • G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
    • 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 backlight, and more particularly, to luminance of light emitted from a light source in a backlight using a fluorescent lamp (CCFL) or a light emitting diode (LED) as a light source.
  • the present invention relates to a highly diffused condensing lens sheet having a novel structure for improving uniformity, and a backlight assembly using the same.
  • the flat panel display includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel, and an electroluminescence display (EL). Since the dual liquid crystal display is a non-light emitting device that does not emit light by itself, an external light source such as a backlight is inevitably required.
  • LCD liquid crystal display
  • FED field emission display
  • EL electroluminescence display
  • FIG. 1 is a cross-sectional view showing a backlight assembly for a liquid crystal display according to the prior art
  • FIG. 2 is a cross-sectional view showing the structure of a light collecting sheet according to the prior art.
  • the backlight assembly 20 for a liquid crystal display includes a top plate 12 that is a color filter substrate and a bottom plate 11 that is a thin film transistor (TFT) substrate. Located at the rear of the liquid crystal panel 10 is provided to serve to provide a light source to the liquid crystal panel 10.
  • TFT thin film transistor
  • the backlight assembly 20 for a liquid crystal display device may include a lamp 21 as a light source for emitting light and a light guide plate 22 for guiding the light emitted from the lamp 21 to the liquid crystal panel 10. , Totally reflecting the light emitted from the lower part of the light guide plate 22 to minimize the loss of light, and an optical sheet 24 to diffuse and collect the light emitted from the upper part of the light guide plate 22 to the liquid crystal panel 10. It is configured to include.
  • the diffusion sheet 24a for diffusing the light emitted from the upper portion of the light guide plate 22 at a predetermined angle, and the diffused light to collect and transmit to the liquid crystal panel 10 It comprises the condensing sheet 24b, the diffusion sheet 24a, and the protective sheet 24c which protects the condensing sheet 24b.
  • the light collecting sheet 24b is a prism film that collects light in an unnecessary viewing angle region in order to compensate for the frontal luminance of light exiting from the lamp 21 through the light guide plate 22 and the diffusion sheet 24a. That is, it plays a role of collecting the light spread widely at the wide viewing angle by the diffusion sheet (a).
  • the light condensing sheet 24b forms a triangular protrusion pattern P having the same size on the upper surface thereof, and the incident light L1, L2, L3, and L4 are applied to the protrusion pattern ( Refraction or total reflection by P) improves the efficiency of the backlight.
  • the portions L2 and L3 of the light incident on the light collecting sheet 24b are refracted at a predetermined angle by the protrusion pattern P to pass through the light collecting sheet 24b, and the pitch of the protrusion pattern P
  • the linear light L1 incident to picth immediately passes through the light collecting sheet 24b without refraction.
  • a part of the light L4 incident on the inclined surface of the protruding pattern P is totally reflected and does not pass through the light collecting sheet 24b and exits to the rear diffusion sheet 24a.
  • part of the light L4 incident on the inclined surface of the protrusion pattern P in the conventional light collecting sheet 24b does not contribute to the improvement of the brightness of the front due to total internal reflection and is emitted to the upper / lower side or the side of the screen. There is a problem that a sidelobe phenomenon occurs.
  • the present invention has been made to solve the above problems, and to provide a high-diffusion condensing lens sheet of a new structure that can improve the overall light brightness by increasing the light collecting performance of the light emitted from the backlight assembly.
  • Another technical problem to be achieved by the present invention is to provide a backlight assembly using a high-diffusion condensing lens sheet having a new structure as described above.
  • the base layer forming a base; And a pattern in which lens-shaped protruding surfaces are randomly arrayed on the base layer, and the average diameter of each of the arrayed protruding surfaces is formed to have a size of 71 ⁇ m to 120 ⁇ m to refract or reflect light incident through the base layer. It may include wealth.
  • each of the protruding surfaces arranged in the pattern portion may have a different size from each other.
  • the base layer may be polyethylene terephthalate (PET) resin, and the pattern portion may be made of acrylic resin.
  • PET polyethylene terephthalate
  • the thickness including the base layer and the pattern portion may be 350 ⁇ m or less.
  • the height of each projecting surface arrayed in the pattern portion may be 50% or less of the diameter of the projecting surface.
  • the backlight assembly of the present invention for achieving the above technical problem is characterized in that it comprises a high diffusion condensing lens sheet formed of the above-described structure.
  • the optical sheet may have an effect of minimizing efficiency reduction of the light source and securing a wide viewing angle.
  • FIG. 1 is a cross-sectional view illustrating a backlight assembly for a liquid crystal display according to the related art.
  • FIG. 2 is a cross-sectional view showing the structure of a prism sheet according to the prior art.
  • 3 and 4 are cross-sectional views illustrating a configuration of a backlight assembly according to various embodiments of the present disclosure.
  • FIG. 5 is a cross-sectional view of a high diffusion condensing lens sheet according to an embodiment of the present invention.
  • FIG. 6 is a perspective view of a high diffusion condensing lens sheet according to an embodiment of the present invention.
  • FIG. 7 is an enlarged view of region A of FIG. 5.
  • FIG. 8 is a graph illustrating a result of measuring luminance according to a lens size of a high-diffusion condensing lens sheet according to an exemplary embodiment of the present invention.
  • 9 is an analysis table showing all-light characteristics according to the size of the protruding surface of the high-diffusion condensing lens sheet.
  • 3 and 4 are cross-sectional views illustrating a configuration of a backlight assembly according to various embodiments of the present disclosure.
  • the backlight assembly may be classified into an edge type or a direct type according to the position of the light source.
  • the edge type of the electron is a structure in which a light source is disposed on a side of a light guide plate (LGP).
  • LGP light guide plate
  • the latter direct type has a structure in which a light source is directly disposed on the rear surface of the liquid crystal panel to supply light to the front surface of the liquid crystal panel.
  • the backlight assembly 100 may include a lamp unit 110 generating light and a lamp unit 110.
  • the light guide plate 120 for guiding the light toward the liquid crystal display panel, the reflective plate 130 which totally reflects the light emitted from the lower portion of the light guide plate 120 to reduce the loss of light, and diffuses and condenses the light emitted above the light guide plate 120. It is comprised including the optical sheet 140 which exits to a panel (not shown).
  • the lamp unit 110 may be configured of a lamp 112 provided on one side or both sides of the light guide plate 120 and a lamp reflector 114 surrounding the lamp 112.
  • the light guide plate 120 may be inclined toward the other side from one side where the lamp unit 110 is installed as shown, so that the thickness of the lower surface may be gradually thinner, or may be formed to have the same thickness.
  • the reflective plate 130 may be disposed along the lower surface of the light guide plate 120.
  • the lamp unit 110 since the lamp unit 110 is positioned at the side of the light guide plate 120, the light generated from the side of the light guide plate 120 is refracted and emitted to the upper liquid crystal panel.
  • the backlight assembly 200 of the direct type is similar to the edge type structure of FIG. 3, which is similar to the lamp unit 210, the light guide plate 220, and the reflective plate 230. ), And may include an optical sheet 240.
  • the lamp unit 210 generating the light source is located under the light guide plate 220.
  • the reflector 230 is positioned below the lamp unit 210 and configured to reflect light leaking backward from the lamp unit 210.
  • the light source generated from the lamp unit 210 is emitted directly from the rear of the light guide plate 220 to the front surface.
  • the optical sheets 140 and 240 are disposed on the light guide plates 120 and 220 to improve the efficiency of the light output from the light guide plates 120 and 220.
  • 240 forms a structure in which the diffusion sheets 141 and 241, the high diffusion condensing lens sheets 143 and 243, and the protective sheets 145 and 245 are sequentially stacked.
  • two diffusion sheets and two high-diffusion condenser lens sheets may be configured as needed.
  • the diffusion sheet and the high-diffusion condenser lens sheet may be added and removed to be used. It is not limited.
  • the diffusion sheets 141 and 241 scatter the light incident from each of the light guide plates 120 and 220 at a predetermined angle to uniform the luminance distribution of the light.
  • the high diffusing condenser lens sheets 143 and 243 collect the light diffused through the diffusion sheets 141 and 241 and emit the light toward the front liquid crystal panel. That is, a protruding surface having a predetermined pattern may be provided on a surface facing the diffusion sheets 141 and 241. Therefore, the efficiency of light is improved by refracting or totally reflecting the light incident on the high-diffusion condensing lens sheets 143 and 243 by the protruding surface.
  • the protective sheets 145 and 245 are disposed on the high diffusing condensing lens sheets 143 and 243 to protect the surfaces of the high diffusing condensing lens sheets 143 and 243, and at the same time, the high diffusing condensing lens sheets 143 and 243. In order to uniformize the distribution of the light incident from These protective sheets 145 and 245 can be removed as needed.
  • FIG. 5 is a cross-sectional view of a high diffusion condensing lens sheet according to an embodiment of the present invention
  • FIG. 6 is a perspective view of a high diffusion condensing lens sheet according to an embodiment of the present invention
  • FIG. 7 is an enlarged view of a region A of FIG. Drawing.
  • the high-diffusion condensing lens sheet 400 has a base layer 410 forming a base of the sheet, and a predetermined pattern on the base layer 410.
  • Protruding surfaces 421, 422, and 423 may include an arrayed pattern part 420.
  • the high-diffusion condensing lens sheet 400 is provided such that the thickness 400h including the base layer 410 and the pattern portion 420 does not exceed 350 ⁇ m, and the thickness 420h of the pattern portion 420. ) Is provided so as not to exceed 50% of the average diameter of the protruding surfaces 421, 422, 423.
  • the base layer 410 may be made of polyethylene terephthalate (PET) resin having excellent light transmittance and a transparent material.
  • PET polyethylene terephthalate
  • the pattern unit 420 may be formed of an acrylic resin, and other transparent materials may be formed of the same material as the base layer 410 or another material corresponding to the transparent material.
  • the pattern part 420 has a plurality of protrusions 421, 422, 423 randomly arranged on one surface of the flat base layer 410, and the plurality of protrusions 421, 422, 423 are provided in a micro lens shape. And the average diameter (D) of the microlenses is formed to have a size of about 71 ⁇ m to about 120 ⁇ m.
  • the plurality of projecting surfaces 421, 422, 423 are characterized by having different sizes within the above range.
  • the first protrusion 421, the second protrusion 422, and the third protrusion 423 adjacent to each other may have diameters of 75 ⁇ m, 85 ⁇ m, and 73.4 ⁇ m, respectively. At this time, the diameters are all the dimensions included in the range of 71 ⁇ m to 120 ⁇ m.
  • the heights 421h, 422h, and 423h of the protruding surfaces 421, 422, and 423 may be 50% or less in the average diameter D of the microlenses.
  • the height 421h of the first protrusion 421 is 37.5 ⁇ m or less
  • the height 422h of the second protrusion 422 is 42.5 ⁇ m or less
  • the height of the third protrusion 423 4523h may be formed to be 36.7 ⁇ m or less.
  • the high-diffusion condensing lens sheet 400 configured as described above may be used by stacking two or more of the same sheet by arranging the protrusions 421, 422, and 423 with different diameters D on the pattern portion 420. In this case, it is possible to prevent a moire phenomenon, an optical phenomenon in which a pattern such as a ripple is formed on the screen.
  • the heights 421h, 422h, and 423h of the protruding surfaces 421, 422, and 423 are in a range of 50% or less of the average diameter D, thereby significantly reducing the moiré phenomenon occurring when the lenses are stacked. At the same time, the brightness can be increased.
  • the luminance according to the size and height of the protruding surface in the high-diffusion condensing lens sheet configured as described above will be measured and compared.
  • FIG. 8 is a graph of luminance measured according to the size of the protruding surface of the high diffusing condensing lens sheet according to the embodiment of the present invention, and is a table comparing the high diffusing condensing lens sheet of the present invention with a conventional condensing sheet.
  • Example 1 shows a high-diffusion condensing lens sheet of the present invention having an average diameter of the protruding surface in the range of 71 ⁇ m to 120 ⁇ m (for example, a size of 75 ⁇ m), and
  • Example 2 of the protruding surface A conventional light collecting sheet having a size (eg, a size of 55 ⁇ m) having an average diameter in the range of 40 ⁇ m to 70 ⁇ m is shown.
  • haze was 82.5% for the conventional light collecting sheet (Example 2), while 87.8% for the high-diffusion light collecting lens sheet of the present invention (Example 1).
  • the brightness is increased, and it can be seen that the high-diffusion condensing lens sheet (Example 1) of the present invention is improved over the conventional condensing sheet (Example 2).
  • the high-diffusion condensing lens sheet (Example 1) of the present invention has a higher luminance than the conventional condensing sheet (Example 2).
  • the high dimension of can increase the concealment against defects in appearance.
  • 9 is an analysis table showing all-light characteristics according to the projecting surface size of the high-diffusion condensing lens sheet.
  • the X-axis coordinates represent the projecting surface size of the high-diffusion condensing lens sheet
  • the left Y-axis coordinates represent haze values
  • the right Y-axis coordinates represent luminance values, respectively.
  • the haze value is low when the size of the protruding surface is fine, then rapidly increases from about 70 ⁇ m, and decreases when the size is more than 120 ⁇ m.
  • the luminance value can be seen that the size of the protruding surface increases after approximately 70 ⁇ m and decreases from 120 ⁇ m or more.
  • the protruding surface when the size of the protruding surface is 70 ⁇ m or less or more than 120 ⁇ m, it has a low luminance value and, of course, a low haze value, so that the diffusivity is low, and thus there is a problem of inferior concealment.
  • the size of the protruding surface exceeds 120 ⁇ m, the protruding surface can be visually identified and the thickness of the high-diffusion condensing lens sheet is increased, which causes problems in light and thinning of the product.
  • the size of the protruding surface within the range of 71 ⁇ m to 120 ⁇ m has a high brightness value and haze value has the advantage of improving the light efficiency and at the same time minimize the appearance defects due to the improved concealability.
  • the high-diffusion condensing lens sheet according to the embodiment of the present invention can obtain improved optical characteristics with respect to luminance and viewing angle by appropriately adjusting the size of the protruding surfaces randomly arranged in the pattern portion within the range of 71 ⁇ m to 120 ⁇ m. have.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

The present invention relates to a high-diffusion condenser sheet for improving the brightness and uniformity of light emitted by a backlight, and to a backlight assembly using same. The high-diffusion condenser sheet of the present invention includes a base layer constituting a base, and a pattern unit having lens-shaped protruding surfaces arrayed at random on the base layer, wherein each of the protruding surfaces is formed into different sizes with an average diameter of 71㎛ to 120㎛.

Description

고확산 집광 렌즈 시트 및 이를 이용한 백라이트 어셈블리High Diffusion Condensing Lens Sheet and Backlight Assembly Using the Same

본 발명은 백라이트(backlight)에 관한 것으로, 더욱 상세하게는 형광램프(Cold Cathode Fluorescent Lamp: CCFL) 또는 발광다이오드(Light Emitting Diode: LED) 등을 광원으로 이용하는 백라이트에서 광원으로부터 출사되는 빛의 휘도 및 균일도를 향상시키기 위한 새로운 구조의 고확산 집광 렌즈 시트 및 이를 이용한 백라이트 어셈블리에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight, and more particularly, to luminance of light emitted from a light source in a backlight using a fluorescent lamp (CCFL) or a light emitting diode (LED) as a light source. The present invention relates to a highly diffused condensing lens sheet having a novel structure for improving uniformity, and a backlight assembly using the same.

최근 들어, 음극선관(Cathode Ray Tube)의 단점인 무게와 부피를 줄일 수 있는 각종 평판표시장치들이 개발되고 있다. Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes.

평판표시장치에는 액정표시장치(LCD: Liquid Crystal Display), 전계방출표시장치(FED: Field Emission Display), 플라즈마 디스플레이 패널(Plasma Display Panel), 전계발광 표시장치(EL: Electro-Luminescence) 등이 있는데, 이중 액정표시장치는 자체 발광을 하지 못하는 비발광 소자이기 때문에 백라이트(backlight)와 같은 외부 광원이 불가피하게 필요하다. The flat panel display includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel, and an electroluminescence display (EL). Since the dual liquid crystal display is a non-light emitting device that does not emit light by itself, an external light source such as a backlight is inevitably required.

도 1은 종래 기술에 따른 액정 표시 장치용 백라이트 어셈블리를 도시한 단면도이고, 도 2는 종래 기술에 따른 집광 시트의 구조를 보인 단면도이다.1 is a cross-sectional view showing a backlight assembly for a liquid crystal display according to the prior art, and FIG. 2 is a cross-sectional view showing the structure of a light collecting sheet according to the prior art.

먼저 도 1을 참조하여 종래 기술에 따른 액정 표시 장치용 백라이트 어셈블리에 대하여 살펴보면, 액정 표시 장치용 백라이트 어셈블리(20)는 컬러 필터 기판인 상판(12)과 박막트랜지스터(TFT) 기판인 하판(11)으로 구비되는 액정 패널(10)의 후방에 위치되어 액정 패널(10)에 광원을 제공하는 역할을 한다. First, referring to FIG. 1, a backlight assembly for a liquid crystal display according to the related art is described. The backlight assembly 20 for a liquid crystal display includes a top plate 12 that is a color filter substrate and a bottom plate 11 that is a thin film transistor (TFT) substrate. Located at the rear of the liquid crystal panel 10 is provided to serve to provide a light source to the liquid crystal panel 10.

이러한 액정 표시 장치용 백라이트 어셈블리(20)는 구체적으로, 빛을 발산하는 광원으로서의 램프(21)와, 램프(21)에서 발산되는 빛을 가이드하여 액정 패널(10)로 진행시켜주는 도광판(22), 도광판(22) 하부로 출사되는 빛을 전반사시켜 광의 손실을 최소화하는 반사판(23), 도광판(22) 상부로 출사되는 빛을 확산 및 집광하여 액정 패널(10)로 출사시키는 광학 시트(24)를 포함하여 구성된다. Specifically, the backlight assembly 20 for a liquid crystal display device may include a lamp 21 as a light source for emitting light and a light guide plate 22 for guiding the light emitted from the lamp 21 to the liquid crystal panel 10. , Totally reflecting the light emitted from the lower part of the light guide plate 22 to minimize the loss of light, and an optical sheet 24 to diffuse and collect the light emitted from the upper part of the light guide plate 22 to the liquid crystal panel 10. It is configured to include.

그리고, 광학 시트(24)는 도시된 바와 같이 도광판(22) 상부로 출사되는 빛을 소정의 각도로 확산시켜주는 확산 시트(24a)와, 확산된 빛을 집광하여 액정 패널(10)로 전달하는 집광 시트(24b), 확산 시트(24a)와 집광 시트(24b)를 보호하는 보호 시트(24c)를 포함하여 구성된다. And, as shown in the optical sheet 24, the diffusion sheet 24a for diffusing the light emitted from the upper portion of the light guide plate 22 at a predetermined angle, and the diffused light to collect and transmit to the liquid crystal panel 10 It comprises the condensing sheet 24b, the diffusion sheet 24a, and the protective sheet 24c which protects the condensing sheet 24b.

이때, 집광 시트(24b)는 램프(21)로부터 도광판(22) 및 확산 시트(24a)를 통과하여 나올 때의 빛의 정면 휘도를 보상하기 위하여, 불필요한 시야각 영역의 빛을 모아주는 프리즘 필름이다. 즉, 확산 시트(a)에 의해 광 시야각으로 넓게 퍼져 있는 빛을 모아주는 역할을 한다. At this time, the light collecting sheet 24b is a prism film that collects light in an unnecessary viewing angle region in order to compensate for the frontal luminance of light exiting from the lamp 21 through the light guide plate 22 and the diffusion sheet 24a. That is, it plays a role of collecting the light spread widely at the wide viewing angle by the diffusion sheet (a).

이러한 집광 시트(24b)는 도 2에 도시된 바와 같이 상면에 동일한 크기로 구비된 삼각 모양의 돌출 패턴(P)을 형성하여, 입사되는 빛(L1, L2, L3, L4)을 이 돌출 패턴(P)에 의해 굴절 또는 전반사시킴으로써 백라이트의 효율을 높이고 있다. As shown in FIG. 2, the light condensing sheet 24b forms a triangular protrusion pattern P having the same size on the upper surface thereof, and the incident light L1, L2, L3, and L4 are applied to the protrusion pattern ( Refraction or total reflection by P) improves the efficiency of the backlight.

이를 테면, 집광 시트(24b)에 입사되는 빛의 일부(L2, L3)는 돌출 패턴(P)에 의해 소정 각도로 굴절되어 집광 시트(24b)를 투과하게 되고, 돌출 패턴(P)의 피치(picth)로 입사되는 직선광(L1)은 굴절없이 집광 시트(24b)를 바로 투과하게 된다. 그리고, 돌출 패턴(P)의 경사면으로 입사되는 빛의 일부(L4)는 전반사되어 집광 시트(24b)를 투과하지 못하고 후방의 확산 시트(24a)로 출사한다. For example, the portions L2 and L3 of the light incident on the light collecting sheet 24b are refracted at a predetermined angle by the protrusion pattern P to pass through the light collecting sheet 24b, and the pitch of the protrusion pattern P The linear light L1 incident to picth immediately passes through the light collecting sheet 24b without refraction. A part of the light L4 incident on the inclined surface of the protruding pattern P is totally reflected and does not pass through the light collecting sheet 24b and exits to the rear diffusion sheet 24a.

그런데, 종래의 집광 시트(24b)에서 돌출 패턴(P)의 경사면으로 입사되는 빛의 일부(L4)가 내부 전반사로 인하여 전방의 휘도 향상에 기여하지 못하고 화면의 상/하부나 측부로 출사되어 사이드로브(sidelobe) 현상이 발생하는 문제점이 있다. However, part of the light L4 incident on the inclined surface of the protrusion pattern P in the conventional light collecting sheet 24b does not contribute to the improvement of the brightness of the front due to total internal reflection and is emitted to the upper / lower side or the side of the screen. There is a problem that a sidelobe phenomenon occurs.

따라서, 화면에 번짐 현상(blurring)이나 잔물결과 같은 무늬가 생기는 모아레(moire) 현상이 발생하여 외관상 결함(defect)이 관찰되는 문제점이 있다. Accordingly, there is a problem in that a moire phenomenon occurs in which a pattern such as blurring or ripples occurs on the screen, and defects in appearance are observed.

본 발명은 이러한 문제점을 해결하기 위해서 도출된 것으로서, 백라이트 어셈블리로부터 방출되는 광의 집광 성능을 높여 전체적인 광 휘도를 향상시킬 수 있는 새로운 구조의 고확산 집광 렌즈 시트를 제공하고자 한다. The present invention has been made to solve the above problems, and to provide a high-diffusion condensing lens sheet of a new structure that can improve the overall light brightness by increasing the light collecting performance of the light emitted from the backlight assembly.

또한, 본 발명이 이루고자 하는 다른 기술적 과제는 전술한 바와 같이 새로운 구조를 갖는 고확산 집광 렌즈 시트를 이용한 백라이트 어셈블리를 제공하고자 하는 것이다. In addition, another technical problem to be achieved by the present invention is to provide a backlight assembly using a high-diffusion condensing lens sheet having a new structure as described above.

또한, 본 발명이 이루고자 하는 또 다른 기술적 과제들은 이상에서 언급한 기술적 과제들로 제한되지 않으며, 언급되지 않은 또 다른 기술적 과제들은 아래의 기재로부터 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 명확하게 이해될 수 있을 것이다. In addition, other technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, another technical problem that is not mentioned from the following description to those skilled in the art to which the present invention belongs. It will be clearly understood.

상기 기술적 과제를 달성하기 위한 본 발명의 고확산 집광 렌즈 시트는, 베이스를 이루는 기저층; 및 상기 기저층 상에 렌즈 형상의 돌출면이 랜덤하게 어레이되고, 상기 어레이된 각 돌출면의 평균 직경은 71㎛ 내지 120㎛ 의 크기로 형성되어 상기 기저층을 통과하여 입사하는 빛을 굴절 또는 반사시키는 패턴부를 포함할 수 있다. High diffusion light collecting lens sheet of the present invention for achieving the above technical problem, the base layer forming a base; And a pattern in which lens-shaped protruding surfaces are randomly arrayed on the base layer, and the average diameter of each of the arrayed protruding surfaces is formed to have a size of 71 μm to 120 μm to refract or reflect light incident through the base layer. It may include wealth.

본 발명의 일례에 따르면, 상기 패턴부에 어레이된 각 돌출면은 서로 상이한 크기를 가질 수 있다. According to an example of the present invention, each of the protruding surfaces arranged in the pattern portion may have a different size from each other.

본 발명의 일례에 따르면, 상기 기저층은 폴리에틸렌테레프탈레이트(Polyethylene Terephthalate: PET) 수지이고, 상기 패턴부는 아크릴 레진(Acryl resin)으로 구성될 수 있다. According to an example of the present invention, the base layer may be polyethylene terephthalate (PET) resin, and the pattern portion may be made of acrylic resin.

또한, 본 발명의 일례에 따르면, 상기 기저층과 상기 패턴부를 포함한 두께는 350㎛ 이하일 수 있다. In addition, according to an example of the present invention, the thickness including the base layer and the pattern portion may be 350 μm or less.

또한, 본 발명의 일례에 따르면, 상기 패턴부에 어레이된 각 돌출면의 높이는 상기 돌출면의 직경의 50% 이하일 수 있다. In addition, according to an example of the present invention, the height of each projecting surface arrayed in the pattern portion may be 50% or less of the diameter of the projecting surface.

한편, 상기 기술적 과제를 달성하기 위한 본 발명의 백라이트 어셈블리는 상술한 구조로 형성된 고확산 집광 렌즈 시트를 포함하여 구성된 것을 특징으로 한다.On the other hand, the backlight assembly of the present invention for achieving the above technical problem is characterized in that it comprises a high diffusion condensing lens sheet formed of the above-described structure.

상기한 본 발명에 따르면, 시트를 이루는 기저층에 랜덤한 크기의 마이크로 렌즈를 형성함으로써 확산과 집광의 기능을 동시에 발휘할 수 있어 높은 휘도 특성을 얻을 수 있는 효과가 있다. 이로써, 광학적 결함(defect)에 대한 은폐성을 높일 수 있다.According to the present invention described above, by forming a microlens having a random size on the base layer of the sheet, it is possible to simultaneously exhibit the functions of diffusion and condensing, thereby obtaining a high luminance characteristic. Thereby, the concealment to an optical defect can be improved.

또한, 광학 시트에 선택적으로 적층 또는 제거하여 사용함으로써 광원의 효율 저하를 최소로 하고 광 시야각을 확보할 수 있는 효과가 있다. In addition, by selectively laminating or removing the optical sheet, the optical sheet may have an effect of minimizing efficiency reduction of the light source and securing a wide viewing angle.

도 1은 종래 기술에 따른 액정 표시 장치용 백라이트 어셈블리를 도시한 단면도이다. 1 is a cross-sectional view illustrating a backlight assembly for a liquid crystal display according to the related art.

도 2는 종래 기술에 따른 프리즘 시트의 구조를 보인 단면도이다.2 is a cross-sectional view showing the structure of a prism sheet according to the prior art.

도 3 및 도 4는 본 발명의 다양한 실시예에 따른 백라이트 어셈블리의 구성을 나타낸 단면도이다. 3 and 4 are cross-sectional views illustrating a configuration of a backlight assembly according to various embodiments of the present disclosure.

도 5는 본 발명의 실시예에 따른 고확산 집광 렌즈 시트의 단면도이다. 5 is a cross-sectional view of a high diffusion condensing lens sheet according to an embodiment of the present invention.

도 6은 본 발명의 실시예에 따른 고확산 집광 렌즈 시트의 사시도이다. 6 is a perspective view of a high diffusion condensing lens sheet according to an embodiment of the present invention.

도 7은 도 5의 A영역을 확대 도시한 도면이다. FIG. 7 is an enlarged view of region A of FIG. 5.

도 8은 본 발명의 실시예에 따른 고확산 집광 렌즈 시트의 렌즈 크기에 따른 휘도를 측정한 결과 그래프이다. 8 is a graph illustrating a result of measuring luminance according to a lens size of a high-diffusion condensing lens sheet according to an exemplary embodiment of the present invention.

도 9는 고확산 집광 렌즈 시트의 돌출면 크기에 따른 전광 특성을 나타낸 분석표이다.9 is an analysis table showing all-light characteristics according to the size of the protruding surface of the high-diffusion condensing lens sheet.

이하, 첨부된 도면들을 참조하여 본 발명의 실시예에 따른 고확산 집광 렌즈 시트 및 이를 이용한 백라이트 어셈블리에 대하여 상세히 설명한다.Hereinafter, a high diffusion condensing lens sheet and a backlight assembly using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 3 및 도 4는 본 발명의 다양한 실시예에 따른 백라이트 어셈블리의 구성을 나타낸 단면도이다. 3 and 4 are cross-sectional views illustrating a configuration of a backlight assembly according to various embodiments of the present disclosure.

통상, 백라이트 어셈블리는 광원의 위치에 따라 엣지형(edge type) 또는 직하형(direct type)으로 구분할 수 있는데, 전자의 엣지형은 도광판(Light Giude Plate; LGP)의 측부에 광원을 배치한 구조이고, 후자의 직하형은 액정 패널의 배면에 직접 광원을 배치하여 액정 패널의 전면으로 빛을 공급하는 구조이다. In general, the backlight assembly may be classified into an edge type or a direct type according to the position of the light source. The edge type of the electron is a structure in which a light source is disposed on a side of a light guide plate (LGP). The latter direct type has a structure in which a light source is directly disposed on the rear surface of the liquid crystal panel to supply light to the front surface of the liquid crystal panel.

먼저 도 3을 참조하여 전자의 엣지형 구조에 대해 구체적으로 살펴보면, 본 발명의 일 실시예에 따른 백라이트 어셈블리(100)는 광을 발생하는 램프 유닛(110)과, 램프 유닛(110)에서 발생되는 광을 액정표시패널 측으로 가이드하는 도광판(120), 도광판(120) 하부로 출사되는 광을 전반사시켜 광의 손실을 줄이는 반사판(130), 및 도광판(120) 상부로 출사되는 광을 확산 및 집광하여 액정 패널(도시하지 않음)로 출사시키는 광학 시트(140)를 포함하여 구성된다. First, referring to FIG. 3, the edge type structure of the electron is described in detail. The backlight assembly 100 according to an exemplary embodiment of the present invention may include a lamp unit 110 generating light and a lamp unit 110. The light guide plate 120 for guiding the light toward the liquid crystal display panel, the reflective plate 130 which totally reflects the light emitted from the lower portion of the light guide plate 120 to reduce the loss of light, and diffuses and condenses the light emitted above the light guide plate 120. It is comprised including the optical sheet 140 which exits to a panel (not shown).

여기서, 램프 유닛(110)은 도광판(120)의 일측 또는 양측에 구비되는 램프(112)와 상기 램프(112)를 감싸는 램프 반사판(114)으로 구성될 수 있다. Here, the lamp unit 110 may be configured of a lamp 112 provided on one side or both sides of the light guide plate 120 and a lamp reflector 114 surrounding the lamp 112.

그리고, 도광판(120)은 도시된 바와 같이 램프 유닛(110)이 설치된 일측에서 타측으로 갈수록 경사져서 하부면의 두께가 점점 얇게 형성될 수 있으며, 또는 동일한 두께로 형성될 수 있다. In addition, the light guide plate 120 may be inclined toward the other side from one side where the lamp unit 110 is installed as shown, so that the thickness of the lower surface may be gradually thinner, or may be formed to have the same thickness.

그리고, 반사판(130)은 도광판(120)의 하부면을 따라 배치될 수 있다. The reflective plate 130 may be disposed along the lower surface of the light guide plate 120.

이러한 구조에 따른 백라이트 어셈블리(100)는 도광판(120)의 측부에 램프 유닛(110)이 위치되므로, 도광판(120)의 측부로부터 발생되는 광을 굴절시켜서 상부측의 액정 패널로 출사시킨다. In the backlight assembly 100 according to the structure, since the lamp unit 110 is positioned at the side of the light guide plate 120, the light generated from the side of the light guide plate 120 is refracted and emitted to the upper liquid crystal panel.

다음으로 도 4를 참조하여 본 발명의 다른 실시예에 따른 직하형의 백라이트 어셈블리(200)에 대해 살펴보면, 이는 도 3의 엣지형 구조와 마찬가지로 램프 유닛(210)과 도광판(220), 반사판(230), 광학 시트(240)를 포함하여 구성될 수 있다. Next, referring to FIG. 4, the backlight assembly 200 of the direct type according to another embodiment of the present invention is similar to the edge type structure of FIG. 3, which is similar to the lamp unit 210, the light guide plate 220, and the reflective plate 230. ), And may include an optical sheet 240.

여기서, 중복된 설명을 피하기 위해 도 3에서의 설명과 동일한 기능을 수행하는 구성요소에 대해서는 생략하고, 상이한 내용만을 살펴보면, 광원을 발생시키는 램프 유닛(210)은 도광판(220)의 하부에 위치되고, 반사판(230)은 램프 유닛(210)의 하부에 위치되어 램프 유닛(210)에서 후방으로 누설되는 광을 반사시키도록 구성된다. Here, in order to avoid overlapping descriptions, components that perform the same functions as those described in FIG. 3 will be omitted. Referring only to the different contents, the lamp unit 210 generating the light source is located under the light guide plate 220. The reflector 230 is positioned below the lamp unit 210 and configured to reflect light leaking backward from the lamp unit 210.

따라서, 램프 유닛(210)으로부터 발생하는 광원이 도광판(220)의 후방에서 전면으로 직접 출사하게 된다. Therefore, the light source generated from the lamp unit 210 is emitted directly from the rear of the light guide plate 220 to the front surface.

이상의 백라이트 어셈블리(100, 200)에서 각 도광판(120, 220)의 상부에는 도광판(120, 220)으로부터 출력되는 광의 효율을 향상시키기 위하여 광학 시트(140, 240)가 배치되는데, 광학 시트(140, 240)는 확산 시트(141, 241), 고확산 집광 렌즈 시트(143, 243) 및 보호 시트(145, 245)가 순차적으로 적층된 구조를 이룬다. In the backlight assembly 100 and 200, the optical sheets 140 and 240 are disposed on the light guide plates 120 and 220 to improve the efficiency of the light output from the light guide plates 120 and 220. 240 forms a structure in which the diffusion sheets 141 and 241, the high diffusion condensing lens sheets 143 and 243, and the protective sheets 145 and 245 are sequentially stacked.

이 외, 필요에 따라 두 장의 확산 시트와 두 장의 고확산 집광 렌즈 시트 즉, 4장의 시트로 구성될 수 있으며, 또는 확산 시트 및 고확산 집광 렌즈 시트를 추가 및 제거하여 사용할 수도 있으므로 도시한 구조에 한정되지는 않는다. In addition, two diffusion sheets and two high-diffusion condenser lens sheets, that is, four sheets, may be configured as needed. Alternatively, the diffusion sheet and the high-diffusion condenser lens sheet may be added and removed to be used. It is not limited.

본 실시예에 따른 확산 시트(141, 241)는 각 도광판(120, 220)으로부터 입사되는 광을 소정의 각도로 산란하여 광의 휘도 분포를 고르게 한다. The diffusion sheets 141 and 241 according to the present exemplary embodiment scatter the light incident from each of the light guide plates 120 and 220 at a predetermined angle to uniform the luminance distribution of the light.

고확산 집광 렌즈 시트(143, 243)는 확산 시트(141, 241)를 통해 확산된 광을 집광하여 전방의 액정 패널을 향해 출사시키는데, 이를 위해 고확산 집광 렌즈 시트(143, 243)는 상면에 즉, 확산 시트(141, 241)와 대향되는 면에 소정 패턴을 갖는 돌출면이 마련될 수 있다. 따라서, 고확산 집광 렌즈 시트(143, 243)로 입사되는 광을 돌출면에 의해 굴절 또는 전반사시킴으로써 광의 효율을 높인다. The high diffusing condenser lens sheets 143 and 243 collect the light diffused through the diffusion sheets 141 and 241 and emit the light toward the front liquid crystal panel. That is, a protruding surface having a predetermined pattern may be provided on a surface facing the diffusion sheets 141 and 241. Therefore, the efficiency of light is improved by refracting or totally reflecting the light incident on the high-diffusion condensing lens sheets 143 and 243 by the protruding surface.

보호 시트(145, 245)는 고확산 집광 렌즈 시트(143, 243)의 상부에 배치되어 고확산 집광 렌즈 시트(143, 243)의 표면을 보호함과 동시에, 고확산 집광 렌즈 시트(143, 243)로부터 입사된 광의 분포를 균일하게 하기 위하여 광을 확산시킨다. 이러한 보호 시트(145, 245)는 필요에 따라 제거될 수 있다. The protective sheets 145 and 245 are disposed on the high diffusing condensing lens sheets 143 and 243 to protect the surfaces of the high diffusing condensing lens sheets 143 and 243, and at the same time, the high diffusing condensing lens sheets 143 and 243. In order to uniformize the distribution of the light incident from These protective sheets 145 and 245 can be removed as needed.

구체적으로, 상기한 고확산 집광 렌즈 시트(143, 243)의 구조에 대해 살펴본다. Specifically, the structure of the high diffusion light collecting lens sheets 143 and 243 will be described.

도 5는 본 발명의 실시예에 따른 고확산 집광 렌즈 시트의 단면도이고, 도 6은 본 발명의 실시예에 따른 고확산 집광 렌즈 시트의 사시도이며, 도 7은 도 6의 A영역을 확대 도시한 도면이다.5 is a cross-sectional view of a high diffusion condensing lens sheet according to an embodiment of the present invention, FIG. 6 is a perspective view of a high diffusion condensing lens sheet according to an embodiment of the present invention, and FIG. 7 is an enlarged view of a region A of FIG. Drawing.

먼저 도 5 및 도 6을 참조하면, 본 발명의 실시예에 따른 고확산 집광 렌즈 시트(400)는 시트의 베이스(base)를 이루는 기저층(410)과, 기저층(410) 상에 소정 패턴을 갖는 돌출면(421, 422, 423)이 어레이된 패턴부(420)를 포함하여 구성될 수 있다. First, referring to FIGS. 5 and 6, the high-diffusion condensing lens sheet 400 according to an exemplary embodiment of the present invention has a base layer 410 forming a base of the sheet, and a predetermined pattern on the base layer 410. Protruding surfaces 421, 422, and 423 may include an arrayed pattern part 420.

본 실시예에서, 고확산 집광 렌즈 시트(400)는 상기 기저층(410)과 패턴부(420)를 포함한 두께(400h)가 350㎛를 초과하지 않도록 구비되며, 패턴부(420)의 두께(420h)는 돌출면(421, 422, 423)의 평균 직경의 50%를 초과하지 않도록 구비된다. In the present embodiment, the high-diffusion condensing lens sheet 400 is provided such that the thickness 400h including the base layer 410 and the pattern portion 420 does not exceed 350 μm, and the thickness 420h of the pattern portion 420. ) Is provided so as not to exceed 50% of the average diameter of the protruding surfaces 421, 422, 423.

기저층(410)은 광 투과력이 우수하고 투명 재질인 폴리에틸렌테레프탈레이트(Polyethylene Terephthalate: PET) 수지로 구성될 수 있다. The base layer 410 may be made of polyethylene terephthalate (PET) resin having excellent light transmittance and a transparent material.

패턴부(420)는 아크릴 레진(Acryl resin)으로 구성될 수 있으며, 이 외 투명 물질이라면 기저층(410)과 동일한 재질 또는 투명 물질에 해당하는 또 다른 재질로 구성될 수 있다. The pattern unit 420 may be formed of an acrylic resin, and other transparent materials may be formed of the same material as the base layer 410 or another material corresponding to the transparent material.

이러한 패턴부(420)는 플랫한 기저층(410)의 일면에 다수의 돌출면(421, 422, 423)이 랜덤하게 어레이되는데, 다수의 돌출면(421, 422, 423)은 마이크로 렌즈 형상으로 구비되고 마이크로 렌즈의 평균 직경(D)이 71㎛ 내지 120㎛ 정도의 크기를 갖도록 형성된다. The pattern part 420 has a plurality of protrusions 421, 422, 423 randomly arranged on one surface of the flat base layer 410, and the plurality of protrusions 421, 422, 423 are provided in a micro lens shape. And the average diameter (D) of the microlenses is formed to have a size of about 71 μm to about 120 μm.

특히, 다수의 돌출면(421, 422, 423)은 상기 범위내에서 각기 상이한 크기를 갖는 것이 특징이다. In particular, the plurality of projecting surfaces 421, 422, 423 are characterized by having different sizes within the above range.

예를 들면, 상호 인접하는 제1 돌출면(421)과 제2 돌출면(422), 제3 돌출면(423)은 각각 75㎛, 85㎛, 73.4㎛의 직경을 가질 수 있다. 이때의 직경은 모두 71㎛ 내지 120㎛ 범위에 포함되는 치수이다. For example, the first protrusion 421, the second protrusion 422, and the third protrusion 423 adjacent to each other may have diameters of 75 μm, 85 μm, and 73.4 μm, respectively. At this time, the diameters are all the dimensions included in the range of 71 μm to 120 μm.

그리고, 각 돌출면(421, 422, 423)의 높이(421h, 422h, 423h)는 마이크로 렌즈의 평균 직경(D)에 50% 이하로 구성될 수 있다. The heights 421h, 422h, and 423h of the protruding surfaces 421, 422, and 423 may be 50% or less in the average diameter D of the microlenses.

상기한 예시에 따르면, 제1 돌출면(421)의 높이(421h)는 37.5㎛ 이하로, 제2 돌출면(422)의 높이(422h)는 42.5㎛ 이하, 제3 돌출면(423)의 높이(4523h)는 36.7㎛ 이하로 형성될 수 있다. According to the above example, the height 421h of the first protrusion 421 is 37.5 μm or less, the height 422h of the second protrusion 422 is 42.5 μm or less and the height of the third protrusion 423 4523h may be formed to be 36.7 μm or less.

따라서, 이와 같이 구성되는 고확산 집광 렌즈 시트(400)는 패턴부(420)에 각 돌출면(421, 422, 423)의 직경(D)을 달리하여 배열함으로써 동일한 시트를 2장 이상 적층하여 사용할 경우 스크린 상에 잔물결과 같은 무늬가 생기는 광학적 현상인 모아레(moire) 현상을 방지할 수 있게 된다. Therefore, the high-diffusion condensing lens sheet 400 configured as described above may be used by stacking two or more of the same sheet by arranging the protrusions 421, 422, and 423 with different diameters D on the pattern portion 420. In this case, it is possible to prevent a moire phenomenon, an optical phenomenon in which a pattern such as a ripple is formed on the screen.

또한, 각 돌출면(421, 422, 423)의 높이(421h, 422h, 423h)는 평균 직경(D)의 50% 이하의 범위가 되도록 하여, 렌즈의 적층시 발생하는 모아레 현상을 현저하게 줄임과 동시에 휘도를 증가시킬 수 있다. In addition, the heights 421h, 422h, and 423h of the protruding surfaces 421, 422, and 423 are in a range of 50% or less of the average diameter D, thereby significantly reducing the moiré phenomenon occurring when the lenses are stacked. At the same time, the brightness can be increased.

이하, 상기한 바와 같이 구성되는 고확산 집광 렌즈 시트에서 돌출면의 크기 및 높이에 따른 휘도를 측정하여 비교해 본다. Hereinafter, the luminance according to the size and height of the protruding surface in the high-diffusion condensing lens sheet configured as described above will be measured and compared.

도 8은 본 발명의 실시예에 따른 고확산 집광 렌즈 시트의 돌출면 크기에 따른 휘도를 측정한 결과 그래프로, 본 발명의 고확산 집광 렌즈 시트와 종래의 집광 시트를 비교한 표이다. 8 is a graph of luminance measured according to the size of the protruding surface of the high diffusing condensing lens sheet according to the embodiment of the present invention, and is a table comparing the high diffusing condensing lens sheet of the present invention with a conventional condensing sheet.

실시예 1은 돌출면의 평균 직경이 71㎛ 내지 120㎛ 범위에 해당하는 크기(일 예로, 75㎛의 크기)를 갖는 본 발명의 고확산 집광 렌즈 시트를 나타낸 것이고, 실시예 2는 돌출면의 평균 직경이 40㎛ 내지 70㎛ 범위에 해당하는 크기(일 예로, 55㎛의 크기)를 갖는 종래의 집광 시트를 나타낸 것이다. Example 1 shows a high-diffusion condensing lens sheet of the present invention having an average diameter of the protruding surface in the range of 71 μm to 120 μm (for example, a size of 75 μm), and Example 2 of the protruding surface A conventional light collecting sheet having a size (eg, a size of 55 μm) having an average diameter in the range of 40 μm to 70 μm is shown.

각 실시예들의 헤이즈(haze) 및 휘도를 측정한 결과, 헤이즈는 종래의 집광 시트(실시예 2)의 경우 82.5%인 반면, 본 발명의 고확산 집광 렌즈 시트(실시예 1)의 경우 87.8%로 종래에 비해 증가하였고, 휘도는 본 발명의 고확산 집광 렌즈 시트(실시예 1)가 종래의 집광 시트(실시예 2)보다 개선됨을 알 수 있다. As a result of measuring haze and luminance of each embodiment, haze was 82.5% for the conventional light collecting sheet (Example 2), while 87.8% for the high-diffusion light collecting lens sheet of the present invention (Example 1). As compared with the prior art, the brightness is increased, and it can be seen that the high-diffusion condensing lens sheet (Example 1) of the present invention is improved over the conventional condensing sheet (Example 2).

일반적으로, 헤이즈가 높으면 휘도가 떨어지는 경향이 있지만, 오히려 본 발명의 고확산 집광 렌즈 시트(실시예 1)는 휘도가 종래의 집광 시트(실시예 2)에 비해 높으므로 휘도가 향상됨은 물론, 헤이즈의 치수도 높아서 외관상 결함(defect)에 대한 은폐성을 높일 수 있다. In general, when the haze is high, the luminance tends to be lowered. On the contrary, the high-diffusion condensing lens sheet (Example 1) of the present invention has a higher luminance than the conventional condensing sheet (Example 2). The high dimension of can increase the concealment against defects in appearance.

도 9는 고확산 집광 렌즈 시트의 돌출면 크기에 따른 전광 특성을 나타낸 분석표이다.9 is an analysis table showing all-light characteristics according to the projecting surface size of the high-diffusion condensing lens sheet.

여기서, X축 좌표는 고확산 집광 렌즈 시트의 돌출면 크기를 나타낸 것이고, 왼쪽 Y축 좌표는 헤이즈 값, 오른쪽 Y축 좌표는 휘도값을 각각 나타낸 것이다. Here, the X-axis coordinates represent the projecting surface size of the high-diffusion condensing lens sheet, the left Y-axis coordinates represent haze values, and the right Y-axis coordinates represent luminance values, respectively.

이러한 분석표를 보면, 헤이즈 값은 돌출면의 크기가 미세한 경우 낮다가 대략 70㎛ 이후부터 급격히 증가하게 되고, 다시 120㎛ 이상의 크기가 되면 감소하는 경향을 보이고 있다. Looking at the analysis table, the haze value is low when the size of the protruding surface is fine, then rapidly increases from about 70 μm, and decreases when the size is more than 120 μm.

또한, 휘도값은 돌출면의 크기가 대략 70㎛이후부터 증가하였다가 120㎛ 이상부터 감소하는 것을 볼 수 있다. In addition, the luminance value can be seen that the size of the protruding surface increases after approximately 70㎛ and decreases from 120㎛ or more.

즉, 돌출면의 크기가 70㎛ 이하이거나 120㎛를 초과해서는 낮은 휘도값을 가짐은 물론, 헤이즈 값이 비교적 낮으므로 확산성이 낮아지고, 이에 따라 은폐성이 떨어지는 문제점이 있다. 게다가, 돌출면의 크기가 120㎛를 초과하게 되면 돌출면을 육안으로 식별할 수 있게 되고 고확산 집광 렌즈 시트의 두께가 증가하게 되므로 제품의 경박 단소화에 문제점이 있다. That is, when the size of the protruding surface is 70 μm or less or more than 120 μm, it has a low luminance value and, of course, a low haze value, so that the diffusivity is low, and thus there is a problem of inferior concealment. In addition, when the size of the protruding surface exceeds 120 μm, the protruding surface can be visually identified and the thickness of the high-diffusion condensing lens sheet is increased, which causes problems in light and thinning of the product.

이에 반해, 돌출면의 크기가 71㎛ 내지 120㎛ 범위내에서는 휘도값 및 헤이즈값이 높아서 광효율을 높임과 동시에 은폐성 향상에 따른 외관상 결함을 최소화 할 수 있는 장점이 있다. On the other hand, the size of the protruding surface within the range of 71 ㎛ to 120 ㎛ has a high brightness value and haze value has the advantage of improving the light efficiency and at the same time minimize the appearance defects due to the improved concealability.

따라서, 본 발명의 실시예에 따른 고확산 집광 렌즈 시트는 패턴부에 랜덤하게 어레이된 돌출면의 크기를 71㎛ 내지 120㎛ 범위내에서 적절히 조절함으로써 휘도 및 시야각에 대하여 개선된 광학적 특성을 얻을 수 있다. Therefore, the high-diffusion condensing lens sheet according to the embodiment of the present invention can obtain improved optical characteristics with respect to luminance and viewing angle by appropriately adjusting the size of the protruding surfaces randomly arranged in the pattern portion within the range of 71 μm to 120 μm. have.

이상 첨부된 도면을 참조하여 본 발명의 실시예를 설명하였지만, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자는 본 발명이 그 기술적 사상이나 필수적인 특징을 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다.Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that.

따라서, 이상에서 기술한 실시예들은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이므로, 모든 면에서 예시적인 것이며 한정적이 아닌 것으로 이해해야만 하며, 본 발명은 청구항의 범주에 의해 정의될 뿐이다. Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

Claims (7)

베이스를 이루는 기저층; 및 A base layer forming a base; And 상기 기저층 상에 렌즈 형상의 돌출면들이 랜덤하게 어레이되고, 어레이된 각 돌출면의 평균 직경은 71㎛ 내지 120㎛ 의 크기로 형성되어 상기 기저층을 통과하여 입사하는 광을 굴절 또는 반사시키는 패턴부Lenticular protrusion surfaces are randomly arrayed on the base layer, and the average diameter of each of the arrayed protrusion surfaces is formed to have a size of 71 μm to 120 μm to refract or reflect light incident through the base layer. 를 포함하는 고확산 집광 렌즈 시트. High diffusing condensing lens sheet comprising a. 제1항에 있어서, The method of claim 1, 상기 패턴부에 어레이된 각 돌출면은 서로 상이한 크기를 갖는 것을 특징으로 하는 고확산 집광 렌즈 시트. Each protruding surface arranged in the pattern portion has a different size from each other. 제1항에 있어서, The method of claim 1, 상기 기저층은 폴리에틸렌테레프탈레이트(Polyethylene Terephthalate: PET) 수지인 것을 특징으로 하는 고확산 집광 렌즈 시트. The base layer is a high diffusion light collecting lens sheet, characterized in that the polyethylene terephthalate (PET) resin. 제1항에 있어서, The method of claim 1, 상기 패턴부는 아크릴 레진(Acryl resin)으로 구성된 것을 특징으로 하는 고확산 집광 렌즈 시트. The pattern portion is a high diffusion condensing lens sheet, characterized in that composed of acrylic resin (Acryl resin). 제1항에 있어서, The method of claim 1, 상기 기저층과 상기 패턴부를 포함한 두께는 350㎛이하인 것을 특징으로 하는 고확산 집광 렌즈 시트. And a thickness including the base layer and the pattern portion is 350 μm or less. 제1항에 있어서, The method of claim 1, 상기 패턴부에 어레이된 각 돌출면의 높이는 상기 돌출면의 직경의 50% 이하인 것을 특징으로 하는 고확산 집광 렌즈 시트. The height of each protruding surface arrayed in the pattern portion is 50% or less of the diameter of the protruding surface. 제1항 내지 제6항에 의해 형성된 고확산 집광 렌즈 시트를 포함하는 백라이트 어셈블리.A backlight assembly comprising the high diffusion condensing lens sheet formed by the claims 1 to 6.
PCT/KR2009/003607 2008-07-09 2009-07-02 High-diffusion condenser sheet and backlight assembly using same Ceased WO2010005205A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020080066748A KR20100006501A (en) 2008-07-09 2008-07-09 High diffusion and condensing lens sheet and backlight assembly using the same
KR10-2008-0066748 2008-07-09

Publications (2)

Publication Number Publication Date
WO2010005205A2 true WO2010005205A2 (en) 2010-01-14
WO2010005205A3 WO2010005205A3 (en) 2010-04-22

Family

ID=41507558

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2009/003607 Ceased WO2010005205A2 (en) 2008-07-09 2009-07-02 High-diffusion condenser sheet and backlight assembly using same

Country Status (2)

Country Link
KR (1) KR20100006501A (en)
WO (1) WO2010005205A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104865782A (en) * 2014-02-20 2015-08-26 卡西欧计算机株式会社 Light source unit including laser diodes as light sources and microlens array and projector
CN110114698A (en) * 2016-12-28 2019-08-09 迪睿合株式会社 Reflective diffusion plate, display device, projection device and lighting device
CN111929978A (en) * 2020-10-15 2020-11-13 成都菲斯特科技有限公司 Projection screen and projection system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200730885A (en) * 2005-12-01 2007-08-16 Fujifilm Corp Optical sheet for display, and manufacturing method and apparatus therefor
KR100817838B1 (en) * 2006-08-24 2008-03-31 희성전자 주식회사 Light guide plate structure of side type backlight device
KR20080060406A (en) * 2006-12-27 2008-07-02 삼성전자주식회사 Optical sheet and display device having same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104865782A (en) * 2014-02-20 2015-08-26 卡西欧计算机株式会社 Light source unit including laser diodes as light sources and microlens array and projector
CN110114698A (en) * 2016-12-28 2019-08-09 迪睿合株式会社 Reflective diffusion plate, display device, projection device and lighting device
US11002889B2 (en) 2016-12-28 2021-05-11 Dexerials Corporation Reflective diffuser plate, display device, projection device, and lighting device
CN110114698B (en) * 2016-12-28 2022-04-05 迪睿合株式会社 Reflective diffuser, display device, projection device and lighting device
CN111929978A (en) * 2020-10-15 2020-11-13 成都菲斯特科技有限公司 Projection screen and projection system

Also Published As

Publication number Publication date
KR20100006501A (en) 2010-01-19
WO2010005205A3 (en) 2010-04-22

Similar Documents

Publication Publication Date Title
US7246931B2 (en) LED light source
JP4133420B2 (en) Backlight and liquid crystal display device
US8184235B2 (en) Optical prism sheet, backlight unit, and liquid crystal display
CN100427976C (en) Prism sheet and backlight unit using same
KR100665871B1 (en) Backlight Assembly of Liquid Crystal Display
WO2011025102A1 (en) Liquid crystal display
CN113495386B (en) Lighting devices and display devices
WO2016186410A1 (en) Reflective polarizing module having particles and backlight unit including same
WO2013032286A1 (en) Optical sheet
WO2012039532A1 (en) Optical sheet, optical unit and lighting device using the same
WO2010005205A2 (en) High-diffusion condenser sheet and backlight assembly using same
CN110720012A (en) Light transmission unit with shielding part, backlight module using the same, and method for manufacturing light transmission unit
WO2009151217A2 (en) Optical sheet, and a backlight assembly and liquid-crystal display device comprising the same
CN1306329C (en) Light source for backlight module
WO2017173703A1 (en) Backlight module and liquid crystal display
CN102162868B (en) Optical sheet and backlight module with optical sheet
TWM409450U (en) Light guide plate with inner laser engraving
US7954983B2 (en) Optical component, manufacturing method of the same and backlight module
WO2020171506A1 (en) Optical structure for light-emitting diode device and light-emitting diode device for lighting application including the same
WO2010114345A2 (en) Light guide plate comprising light diffusing particles
WO2014168387A1 (en) Inverse prism-type optical element
KR101419242B1 (en) Backlight unit and liquid crystal display using the same
KR20120039405A (en) Backlight unit and liquid crystal display device having the same
KR100877411B1 (en) Luminance enhancement sheet, backlight device comprising same, liquid crystal display, and manufacturing method thereof
WO2010058999A2 (en) Optical sheet and backlight unit furnished with same

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09794611

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09794611

Country of ref document: EP

Kind code of ref document: A2