WO2010126188A1 - Plaque de diffusion de lumière pour unité de rétroéclairage lcd - Google Patents

Plaque de diffusion de lumière pour unité de rétroéclairage lcd Download PDF

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Publication number
WO2010126188A1
WO2010126188A1 PCT/KR2009/002312 KR2009002312W WO2010126188A1 WO 2010126188 A1 WO2010126188 A1 WO 2010126188A1 KR 2009002312 W KR2009002312 W KR 2009002312W WO 2010126188 A1 WO2010126188 A1 WO 2010126188A1
Authority
WO
WIPO (PCT)
Prior art keywords
backlight unit
light
diffusion plate
lcd backlight
light diffusion
Prior art date
Application number
PCT/KR2009/002312
Other languages
English (en)
Korean (ko)
Inventor
김광수
서정태
이문복
정인식
Original Assignee
도레이새한 주식회사
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 도레이새한 주식회사 filed Critical 도레이새한 주식회사
Publication of WO2010126188A1 publication Critical patent/WO2010126188A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to a light diffusing plate for an LCD backlight unit, and more particularly, to maximize the refraction and scattering effect of light to shield the backlight required for a backlight and a slimmer backlight composed of a linear lamp and a light emitting diode (LED).
  • the present invention relates to a light diffusion plate for an LCD backlight unit that can improve characteristics and reduce costs.
  • a display device for displaying an image has been rapidly developed according to its use and type, and a liquid crystal display device excellent in performance and function among various kinds of display devices is widely used.
  • a liquid crystal display panel (LCD panel) including two substrates having electrodes formed thereon and a liquid crystal layer injected therebetween applies liquid crystal molecules of a liquid crystal layer by applying a voltage to the electrodes of the liquid crystal display panel.
  • LCD panel liquid crystal display panel
  • By rearranging the images an image is displayed by adjusting the amount of light transmitted. Since the image is displayed by adjusting the amount of light transmitted using the LCD panel, the image is formed on the LCD panel.
  • a typical method for minimizing the loss of light emitted from the light source and sending as much light as possible to the LCD panel is to use a diffuser plate and a plurality of diffuser and prism sheets having a thin film structure.
  • the assembly process of the optical sheets having a thin film structure becomes difficult and the manufacturing cost increases due to the cost increase of the optical sheets. Therefore, the integration of the optical sheet and the diffusion plate to reduce the cost and improve the light efficiency. There is a lot of research on this.
  • the direct type backlight unit does not use the light guide plate used in the edge light type backlight unit, but installs several lamps on the reflecting plate and uses a diffuser plate on top of the diffuser plate. It serves to evenly distribute irregular light generated by the light source arranged on the bottom of the backlight unit with an arrangement and to support various optical sheets.
  • the diffusion plate is manufactured by melting and extruding a plastic resin chip, and includes organic or inorganic particles that scatter light to shield a lamp and make light of uniform brightness. In this case, due to the scattering of light, the light diffuses on both sides rather than the light in the front direction can be effectively made a surface light source.
  • the current liquid crystal display is an ultra-thin manufacturing or due to the sharp reduction in the number of lamps, the conventional diffusion plate is not able to effectively shield the point or linear light source.
  • the object of the present invention is to replace the conventional diffusion plate that is conventionally applied to at least one surface of the diffusion plate produced by melt-extruded non-woven fabric consisting of several layers to several hundred layers
  • the object of the present invention is to replace the conventional diffusion plate that is conventionally applied to at least one surface of the diffusion plate produced by melt-extruded non-woven fabric consisting of several layers to several hundred layers
  • a light diffusion plate for an LCD backlight unit wherein a nonwoven fabric is laminated on one surface of the light diffusion plate manufactured by melting and extruding a plastic chip.
  • the base resin and the light diffusing agent of the plastic chip are acrylic, urethane, epoxy, vinyl, polyester, polyamide, polystyrene, etc., such as polymethyl methacrylate or methacrylic acid ester copolymer, respectively. It is characterized by the single or in mixture of 2 or more types in resin.
  • the refractive index of the base resin and the refractive index of the light diffusing agent are 1.4 to 1.6, respectively, and the base resin and the light diffusing agent include two or more base resins and light diffusing agents each having a single or different refractive index. Characterized in that.
  • the non-woven fabric is a non-bonding rate of 0% to 85%, and the weight of 10 ⁇ 100g / m 2, the material of the nonwoven fabric is characterized in that the polypropylene (PP) or polyethylene terephthalate (PET).
  • PP polypropylene
  • PET polyethylene terephthalate
  • a pattern layer considering light collection efficiency is formed on the other side of the light diffusion plate on which the nonwoven fabric is laminated, wherein the pattern layer has a semi-circular or semi-elliptic columnar three-dimensional structure or the cross-section is triangular or
  • the polygonal columnar structure or a plurality of three-dimensional structure selected from the cone and polyhedron pyramid is characterized in that the surface is structured.
  • the three-dimensional structure of the pattern layer is characterized in that at least two types of three-dimensional structure having the same width and different height are repeated regularly or irregularly.
  • the three-dimensional structure of the pattern layer is characterized in that at least two types of three-dimensional structure having the same height and different widths are repeated regularly or irregularly.
  • the three-dimensional structure of the pattern layer is preferably characterized in that the non-linear arrangement on the basis of the plane.
  • the non-woven fabric is laminated on at least one surface of the light diffusion plate manufactured by melt-extrusion of the plastic chip, thereby effectively solving the problem of visible visibility caused by the use of a point light source (LED), slimming the backlight, and reducing the number of lamps. It has the effect of reducing the like.
  • LED point light source
  • the light diffusing plate for the LCD backlight unit relates to a light diffusing plate used in the backlight unit of the LCD panel, a line irradiated from a cold cathode fluorescent lamp or an LED light source located on the side or the rear to obtain a clear image of the display.
  • the present invention relates to a light diffusing plate capable of inducing uniform surface light while obtaining light from fluorescence or point light and obtaining high luminance and clear light images.
  • the light diffusing plate for an LCD backlight unit is manufactured by melting and extruding a plastic chip and non-woven fabric is laminated on at least one surface of the light diffusing plate.
  • the light diffusing plate is manufactured by extruding by adding a light diffusing agent to the base resin and the molten base resin melted the plastic chip.
  • the base resin and the light diffusing agent of the plastic chip are resins such as acrylic, urethane, epoxy, vinyl, polyester, and polyimide polystyrene, such as polymethyl methacrylate or methacrylic acid ester copolymer, respectively. It is characterized in that single or 2 or more types in it.
  • the refractive index of the base resin and the refractive index of the light diffusing agent are 1.4 to 1.6, respectively, and the base resin and the light diffusing agent include two or more base resins and light diffusing agents each having a single or different refractive index. Characterized in that.
  • the light diffusing plate for an LCD backlight unit is characterized in that the non-woven fabric is laminated on at least one surface of the light diffusing plate, which is used by effectively scattering and refracting the non-woven fabric formed from several layers to several hundred layers.
  • the non-woven fabric is laminated on at least one surface of the light diffusing plate, which is used by effectively scattering and refracting the non-woven fabric formed from several layers to several hundred layers.
  • the nonwoven fabric has basic properties of 50 to 95% haze and 30 to 90% transmittance.
  • the nonwoven fabric has an unbonding ratio of 0% to 85%, preferably 10 to 100 g / m 2 , and the nonwoven fabric may be made of polypropylene (PP) or polyethylene terephthalate (PET).
  • PP polypropylene
  • PET polyethylene terephthalate
  • the non-bonding rate of the nonwoven fabric is greater than 85% (less than 15% bonding rate)
  • the formed web may have insufficient form stability and low strength, and thus may not be applied as a cloth, and the nonwoven fabric may have a weight of 10 g / m 2. If it is less than one, there is a disadvantage in that it is not economically produced, such as a decrease in productivity, and if the weight exceeds 100 g / m 2, it is too thick, so that heat transfer is difficult in performing heat calendering to give form stability. This is because there is a problem that becomes difficult.
  • the light diffusion plate manufactured according to the present invention has improved shielding performance than the conventional light diffusion plate when mounted in the backlight unit.
  • the light diffusion plate for an LCD backlight unit is characterized in that the nonwoven fabric is laminated on the other side of the light diffusion plate laminated with a pattern layer in consideration of the light collection efficiency, the pattern layer is semi-circular or semi-elliptical in cross section.
  • Phosphorus columnar three-dimensional structure or its cross-section is a triangular or polygonal columnar three-dimensional structure or a plurality of three-dimensional structure selected from cone and polyhedron pyramid is characterized in that the surface is structured.
  • the three-dimensional structure of the pattern layer may have at least two kinds of three-dimensional structures having the same width and different heights, or may be repeated regularly or irregularly, or the three-dimensional structure of the pattern layer may have the same height and at least two different widths. It is characterized in that the conformation is repeated regularly or irregularly. More preferably, the three-dimensional structure of the pattern layer is characterized in that the non-linear arrangement on the basis of the plane.
  • paper calendaring means heat pressing on one side of a nonwoven fabric as is well known to those skilled in the art.
  • nonwoven fabric used in the examples used a non-woven fabric having a weight of 30 g / m 2 having an unbonded 85% of paper calendaring.
  • Example 1 was prepared by using a base layer comprising a polycarbonate resin (LG Dow, Caliber 300-22) and acrylic diffusion particles (Mitsubishi Rayon, VH-001) used in the manufacture of a conventional light diffusion plate.
  • the extrusion was performed to obtain a light diffusing plate, and the ejection speed of the extruder was adjusted to obtain a light diffusing plate of 2 mm. At this time, by controlling the amount of diffusion particles was adjusted so that the transmittance is 65%.
  • the non-woven fabric was laminated on one surface of the light diffusion plate by using an acrylic adhesive to prepare a light diffusion plate for an LCD backlight unit.
  • Example 2 was the same as the light diffusion plate made in Example 1 and the other conditions were formed on the one side using a pattern roll to form a triangular prism pattern, on the back of the non-woven fabric as described above using an acrylic adhesive to the LCD A light diffusion plate for a backlight unit was prepared.
  • Comparative Example is obtained by extruding the light diffusion plate by using a substrate layer containing a polycarbonate resin and acrylic diffusion particles used in the manufacture of a conventional light diffusion plate, by adjusting the ejection speed of the extruder to 2mm A light diffuser plate was obtained. At this time, by adjusting the amount of the diffusion particles to adjust the transmittance to 65% to prepare a light diffusion plate for the LCD backlight unit.
  • the shielding force was quantified by defining the front brightness of the backlight assembly at equal intervals 100 points by using Topcon's BM-7A measuring device as shown in Equation 1 below.
  • Equation 1 is a formula created to quantify the shielding force, and is a method of evaluating how uniformly the overall brightness is obtained by comparing the brightness deviation between the dark part and the wrist by measuring the brightness at a close interval. It indicates that the luminance deviation is small, indicating that the shielding power is excellent.
  • the luminance was compared by measuring the luminance values of nine points on the front side of the backlight assembly using Topcon's BM-7A measuring device.
  • the light diffusing effect can be maximized to greatly improve the shielding performance, and also by forming a specific pattern in consideration of the light condensing performance, the luminance compensation With this proper construction, it is easy to manufacture a light diffusion plate having excellent performance in an optical sheet assembly for a backlight, and it is possible to reduce the number of sheets used in the backlight unit, thereby reducing the cost.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L'invention concerne une plaque de diffusion de lumière destinée à une unité de rétroéclairage LCD, et plus spécifiquement une plaque de diffusion de lumière constituée d'une rampe linéaire et d'une diode électroluminescente, pour une unité de rétroéclairage LCD afin de maximiser les effets de réfraction et de dispersion de lumière, ceci permettant d'améliorer l'effet de protection contre la lumière requis pour les rétroéclairages, y compris les rétroéclairages ultrafins, tout en réduisant les coûts de fabrication. Par conséquent, la plaque de diffusion de lumière pour une unité de rétroéclairage LCD est fabriquée par fusion et extrusion d'une puce en matière plastique, et par laminage d'un côté de la plaque de diffusion de lumière fabriquée à l'aide d'un tissu non tissé, de sorte que le taux de non liaison et le poids dudit tissu non tissé soient de préférence compris entre 0 % et 85 % et 10 g/m2 et 100 g/m2, respectivement, et le matériau dudit tissu non tissé est du polypropylène (PP) ou du polyéthylènetéréphtalate (PET).
PCT/KR2009/002312 2009-04-29 2009-04-30 Plaque de diffusion de lumière pour unité de rétroéclairage lcd WO2010126188A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2009-0037581 2009-04-29
KR20090037581 2009-04-29

Publications (1)

Publication Number Publication Date
WO2010126188A1 true WO2010126188A1 (fr) 2010-11-04

Family

ID=43032320

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2009/002312 WO2010126188A1 (fr) 2009-04-29 2009-04-30 Plaque de diffusion de lumière pour unité de rétroéclairage lcd

Country Status (1)

Country Link
WO (1) WO2010126188A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140254195A1 (en) * 2011-07-19 2014-09-11 3M Innovation Properties Company Surface illuminant device
US20150022757A1 (en) * 2012-01-31 2015-01-22 3M Innovative Properties Company Display with nonwoven diffuser

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6280623A (ja) * 1985-10-04 1987-04-14 Alps Electric Co Ltd 液晶表示装置
JPH095504A (ja) * 1995-06-19 1997-01-10 Nitto Denko Corp 光拡散板
KR20080042882A (ko) * 2005-09-06 2008-05-15 도레이 가부시끼가이샤 광확산 필름 및 이것을 사용한 면광원

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6280623A (ja) * 1985-10-04 1987-04-14 Alps Electric Co Ltd 液晶表示装置
JPH095504A (ja) * 1995-06-19 1997-01-10 Nitto Denko Corp 光拡散板
KR20080042882A (ko) * 2005-09-06 2008-05-15 도레이 가부시끼가이샤 광확산 필름 및 이것을 사용한 면광원

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140254195A1 (en) * 2011-07-19 2014-09-11 3M Innovation Properties Company Surface illuminant device
US9423549B2 (en) * 2011-07-19 2016-08-23 3M Innovative Properties Company Surface illuminant device
US20150022757A1 (en) * 2012-01-31 2015-01-22 3M Innovative Properties Company Display with nonwoven diffuser
US9494817B2 (en) * 2012-01-31 2016-11-15 3M Innovative Properties Company Display with nonwoven diffuser

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