KR20010048744A - the Composition for the Light-Diffusing Film - Google Patents
the Composition for the Light-Diffusing Film Download PDFInfo
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- KR20010048744A KR20010048744A KR1019990053544A KR19990053544A KR20010048744A KR 20010048744 A KR20010048744 A KR 20010048744A KR 1019990053544 A KR1019990053544 A KR 1019990053544A KR 19990053544 A KR19990053544 A KR 19990053544A KR 20010048744 A KR20010048744 A KR 20010048744A
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J5/18—Manufacture of films or sheets
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
- C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
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- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
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Abstract
Description
본 발명은 광확산 필름의 조성물에 관한 것 이다.The present invention relates to a composition of a light diffusing film.
산업 분야가 다양해지면서 고분자 수지 필름의 적용분야가 각종 포장용, 사진필름용, 콘덴서용, 전기절연재용, 라벨용, 자기기록매체용, 의료용으로 광범위하게 사용해지고 있으며, 최근에는 그 사용범위가 배면 투사 스크린, 플라즈마 디스플레이 패널, 액정표시소자 등과 같은 화상표시소자 분야로까지 확대되고 있다.As the industrial fields are diversified, the application fields of polymer resin films are widely used for various packaging, photographic film, condenser, electric insulation material, label, magnetic recording medium, and medical use. It is expanding to the field of image display devices such as screens, plasma display panels and liquid crystal display devices.
특히, 화상표시소자의 디스플레이 방식은 음극선과는 달리 소자의 뒷면에 부착된 백라이드의 형광관으로 부터 발생되는 빛을 금속 증착층 또는 백색판에 반사시켜 도광판을 통하여 화상을 표시하는 간접 조명 방식인 관계로 화상이 잘 보이지 않는 문제점이 있으며, 화상표시소자의 대형화 추세에 따라 점점 심화되고 있는 실정이다.In particular, the display method of the image display device, unlike the cathode ray, is an indirect illumination method that displays an image through a light guide plate by reflecting light generated from a fluorescent tube of a backlight attached to the back of the device to a metal deposition layer or a white plate. As a result, there is a problem in that an image is hard to be seen, and it is increasingly deepened according to an increase in the size of an image display device.
이러한 문제점을 극복하기 위하여 도광판 위에 접착되어 균일하게 광선을 확산시킴으로써 휘도를 증가시킬 수 있는 광확산 필름이 개발되어 왔다.In order to overcome this problem, a light diffusing film has been developed that can be bonded to the light guide plate to increase luminance by uniformly diffusing light rays.
예로써 일본국 공개 특허 특개평6-67003호, 동 특개평7-174909 및 동 특개평9-127314호 등에서는 투명한 고분자 수지 필름의 한쪽면에 광확산제로써 무기 또는 유기입자를 투명한 바인더 수지와 함께 유기 용매에 분산시킨 용액을 도포한 광확산 필름이 제안되었다.For example, Japanese Patent Laid-Open Nos. Hei 6-67003, Hei 7-174909, and Hei 9-127314, etc., show inorganic or organic particles as a light diffusing agent on one side of a transparent polymer resin film. A light diffusion film coated with a solution dispersed in an organic solvent together has been proposed.
이와 같이 형성된 광확산 필름은 고휘도와 같이 우수한 광학 특성이 요구될 뿐만 아니라, 전체 면(面)에 걸쳐 균일한 휘도를 나타내는 휘도 균일도가 중요 특성으로 요구되어지고 있다.The light diffusing film formed as described above is not only required to have excellent optical characteristics such as high luminance, but also to have uniformity in luminance that exhibits uniform luminance over the entire surface.
휘도 균일도를 충족시키기위해서는 유기 또는 무기 광확산제를 광확산층 내에서 충분히 분산 시키는 것도 중요하지만, 아무리 분산이 잘 이루어진 조성물이라고 하더라도 기재상에 코팅할 때, 광확산층이 균일하게 도포 형성되지 않으면 휘도 균일도를 충족시킬 수가 없다.It is also important to sufficiently disperse the organic or inorganic light diffusing agent in the light diffusing layer to satisfy the uniformity of the brightness, but even if the composition is well dispersed, the brightness uniformity is uniform when the light diffusing layer is not uniformly formed when coating on the substrate. Can not meet.
특히 기재로서 사용되는 고분자 수지는 높은 전기 저항율로 인하여, 균일한 도포 형성에 어려움이 있었고, 도포된 광확산층을 건조하였을 때, 광확산층의 표면에 정전기 스팟(spot)이라고 불리우는 새발 모양 또는 타원형의 코팅 불균일이 발생하여 외관이 불량해질 뿐만 아니라, 이로 인하여 휘도가 저하되고 휘도 균일도 역시 현저히 떨어지는 문제가 발생한다.In particular, the polymer resin used as a substrate has difficulty in forming a uniform coating due to the high electrical resistivity, and when the coated light diffusing layer is dried, a bird-shaped or oval coating called an electrostatic spot is formed on the surface of the light diffusing layer. Not only does the unevenness cause poor appearance, but also causes a problem that the brightness is lowered and the brightness uniformity is also significantly lowered.
본 발명은 상기한 바의 종래 기술의 문제점을 개선하여 정전기 스팟의 발생이 없어 휘도 특성이 뛰어나고 휘도 균일도가 우수한 광확산 필름의 조성물을 제공하는 것에 그 목적이 있다.SUMMARY OF THE INVENTION The present invention aims to provide a composition of a light-diffusion film which is excellent in luminance characteristics and excellent in luminance uniformity by eliminating the problem of the prior art as described above and thus preventing the occurrence of electrostatic spots.
상기한 목적을 달성하기 위한 본 발명은 무기 또는 유기 광확산제와 투명한 바인더 수지 및 경화제를 단독 또는 2종 이상의 유기 용매에 분산시켜 제조한 광확산 필름의 조성물에 있어서, 조성물의 체적 저항율이 1X1012Ω㎝ 이하인 것을 특징으로 한다.In order to achieve the above object, the present invention provides a composition of a light diffusion film prepared by dispersing an inorganic or organic light diffusing agent, a transparent binder resin, and a curing agent alone or in two or more organic solvents, wherein the volume resistivity of the composition is 1 × 10 12. It is characterized by being Ωcm or less.
광확산층을 기재위에 균일하게 형성시키는 데는 여러가지 공정 조건의 영향이 존재하지만, 특히 체적저항율이 1X1013Ω㎝ 이상인 유기 고분자로서 구성되는 바인더 및 광확산제는 코팅 공정을 수행하는 동안 조성물과 기재 사이에서 정전기를 발생시키는 원인으로 작용하여 광확산층 표면에 정전기 스팟이 발생하여 건조된 다음 외관이 불량할 뿐만 아니라, 휘도가 저하되고, 휘도 균일도 또한 현저히 떨어지게 된다.Although there are effects of various process conditions on the uniform formation of the light diffusion layer on the substrate, the binder and the light diffusing agent, which are particularly composed of an organic polymer having a volume resistivity of 1 × 10 13 Ωcm or more, are formed between the composition and the substrate during the coating process. As a cause of generating static electricity, an electrostatic spot is generated and dried on the surface of the light diffusion layer, and then not only the appearance is poor, but also the luminance is lowered, and the luminance uniformity is also significantly decreased.
이러한 정전기 스팟은 유기 용매가 함유된 조성물이 기재에 도포되는 과정 또는 도포된 다음, 건조되기 전에 발생하는 것이므로 전체 광확산 조성물의 체적 저항율을 제어하기 위해서는 유기 용매의 체적 저항율을 제어하는 것이 중요하다.Since such electrostatic spots occur before the composition containing the organic solvent is applied to the substrate or before being applied and then dried, it is important to control the volume resistivity of the organic solvent in order to control the volume resistivity of the entire light diffusion composition.
표1은 도료 또는 잉크 조성물에서 사용되는 용매의 체적저항율에 대한 것으로서, 메틸에틸케톤, 메틸이소부틸케톤, n-부틸아세테이트, 사이클로헥사논 및 세룰솔브아세테이트가 체적 저항만을 고려하였을 때, 1X1012Ω㎝ 이하로서 단독으로 광확산 조성물의 용매로써 사용하더라도 정전기를 발생하지 않는 용매이지만, 휘발성, 용해성, 분산성 및 레벨링성과 같은 도료 특성을 고려하여 단독 또는 2종류 이상의 용매를 혼합하여 사용하는 것이 바람직하다.Table 1 shows the volume resistivity of the solvent used in the paint or ink composition. When methyl ethyl ketone, methyl isobutyl ketone, n-butyl acetate, cyclohexanone and cerulesolve acetate only consider the volume resistance, 1 X 10 12 Ω It is a solvent which does not generate static electricity even when used alone as a solvent of the light-diffusion composition as cm or less, but in consideration of paint properties such as volatility, solubility, dispersibility and leveling property, it is preferable to use singly or in combination of two or more kinds of solvents. .
한편, 다른 용매에 비교하여 저가이며, 용해성이 우수한 톨루엔의 경우 1X1013Ω㎝ 이지만, 메틸에틸케톤과 7:3 내지 1:9로 혼합하는 경우에는 체적 저항을 9X1011내지 6X108Ω㎝로 낮출 수 있다.On the other hand, a low-cost compared to other solvents, although the solubility is 1X10 13 Ω㎝ For excellent toluene, methyl ethyl ketone, and 7: 3 to 1: 9, in the case of mixing to lower the volume resistivity to 9X10 11 to 6X10 8 Ω㎝ Can be.
이상의 목적에 부합되는 광확산 필름을 제조하는 방법은 통상의 필름 제조방법에 준하여 실시될 수 있는데, 먼저 광확산제와 바인더 수지 및 소량의 경화제를 체적 저항율이 1X1012Ω㎝ 이하인 단독 또는 혼합 용매에 균일하게 분산시킨 바인더 수지 용액을 기재 필름, 바람직하게는 폴리에틸렌테레프탈레이트(PET) 필름 상에 도포한 다음, 건조시켜 광확산층을 형성함으로써 얻을 수 있다.The method for producing a light diffusing film that meets the above objectives may be carried out according to a conventional film production method. First, a light diffusing agent, a binder resin, and a small amount of a curing agent are added to a single or mixed solvent having a volume resistivity of 1 × 10 12 Ωcm or less. A uniformly dispersed binder resin solution may be applied onto a base film, preferably a polyethylene terephthalate (PET) film, and then dried to form a light diffusion layer.
광확산성 조성물을 기재 필름에 도포하는 방법은 당해 기술분야에서 통상적으로 알려져 있는 방법이라면 특별히 제한되지 않고 채택될 수 있으며, 기재 필름의 재질 및 형상에 따라 예를 들면 에어 나이프(air knife) 방식, 그라비아 방식(gravure), 리버스 롤(reverse roll) 방식, 스프레이(spray) 방식 또는 블레이드(blade) 방식 중에서 임의로 선택하여 사용할 수 있다.The method of applying the light diffusing composition to the base film is not particularly limited as long as it is commonly known in the art, and may be adopted according to the material and shape of the base film, for example, an air knife method, A gravure method, a reverse roll method, a spray method, or a blade method can be arbitrarily selected.
광확산물을 기재 필름에 도포한 후에는 열풍, 적외선, 원적외선 등을 조사하여 가열함으로써 코팅층을 형성한다.After apply | coating a light diffuser to a base film, a coating layer is formed by heating by irradiating hot air, infrared rays, far-infrared rays, etc.
이하 실시예에 의하여 본 발명의 더욱 상세히 설명한다. 그러나 본 발명은 하기된 실시예의 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited by the examples described below.
〈실시예 1〉<Example 1>
하기의 조성으로 용매에 바인더 및 경화제를 용해시킨 후 광확산제를 교반하면서 투입하여 분산시켜 체적 저항이 4X1010Ω㎝인 조성물을 제조하였으며, 하기 방법에 따라 광확산 필름으로 제조하여 광확산 필름 표면의 정전기 스팟 발생 여부를 평가하여 그 결과를 표 2에 나타내었다.After dissolving a binder and a curing agent in a solvent with the following composition, a light diffusing agent was added and dispersed while stirring to prepare a composition having a volume resistivity of 4 × 10 10 Ωcm. To evaluate the occurrence of the electrostatic spot of the results are shown in Table 2.
용제 41.4중량부Solvent 41.4 parts by weight
(n-부틸아세테이트, 체적 저항율 2.08X1010Ω㎝ )(n-butyl acetate, volume resistivity 2.08X10 10 Ωcm)
바인더 수지 25.4중량부25.4 parts by weight of binder resin
(아크리딕 AA-960-50, 애경화학사 제품, 고형분 55%)(Acrydick AA-960-50, manufactured by Aekyung Chemical Co., Ltd., 55% solids)
경화제 2.9중량부2.9 parts by weight of curing agent
(브루녹 DN-950, 애경화학사 제품)(Brunnock DN-950, manufactured by Aekyung Chemical Co., Ltd.)
광확산제 30.3중량부30.3 parts by weight of light diffusing agent
(테크폴리머 MBX-15, Sekisui사 제품)(Tech Polymer MBX-15, manufactured by Sekisui Corporation)
〈실시예 2〉<Example 2>
실시예1과 동일한 장치와 방법을 사용하되, 하기의 조성으로 체적 저항이 2X109Ω㎝인 광확산 조성물을 제조하였으며, 광확산 필름 표면의 정전기 스팟 발생 여부를 평가하여 그 결과를 실시예 1과 함께 표 2에 나타내었다.Using the same apparatus and method as in Example 1, a light diffusing composition having a volume resistivity of 2 × 10 9 Ωcm was prepared using the following composition, and the results of evaluating the occurrence of electrostatic spots on the surface of the light diffusing film were evaluated. Together is shown in Table 2.
용제 41.4중량부Solvent 41.4 parts by weight
(메틸에틸케톤 : 톨루엔 = 1:1,체적 저항율 1.06X109Ω㎝)(Methylethylketone: toluene = 1: 1, volume resistivity 1.06X10 9 Ωcm)
바인더 수지 25.4중량부25.4 parts by weight of binder resin
(아크리딕 AA-960-50, 애경화학사 제품)(Acrydick AA-960-50, Aekyung Chemical Co., Ltd.)
경화제 2.9중량부2.9 parts by weight of curing agent
(브루녹 DN-950, 애경화학사 제품)(Brunnock DN-950, manufactured by Aekyung Chemical Co., Ltd.)
광확산제 30.3중량부30.3 parts by weight of light diffusing agent
(테크폴리머 MBX-15, Sekisui사 제품)(Tech Polymer MBX-15, manufactured by Sekisui Corporation)
〈비교실시예 1〉<Comparative Example 1>
실시예1과 동일한 장치와 방법을 사용하되, 하기의 조성으로 체적 저항이 6X1012Ω㎝인 광확산 조성물을 제조하였으며, 광확산 필름 표면의 정전기 스팟 발생 여부를 평가하여 그 결과를 실시예 1과 함께 표 2에 나타내었다.Using the same apparatus and method as in Example 1, a light diffusing composition having a volume resistivity of 6 × 10 12 Ωcm was prepared using the following composition, and the result of evaluating the occurrence of electrostatic spots on the surface of the light diffusing film was evaluated. Together is shown in Table 2.
용제 41.4중량부Solvent 41.4 parts by weight
(톨루엔, 체적 저항 1.29X1013Ω㎝ )(Toluene, volume resistance 1.29X10 13 Ωcm)
바인더 수지 25.4중량부25.4 parts by weight of binder resin
(아크리딕 AA-960-50, 애경화학사 제품)(Acrydick AA-960-50, Aekyung Chemical Co., Ltd.)
경화제 2.9중량부2.9 parts by weight of curing agent
(브루녹 DN-950, 애경화학사 제품)(Brunnock DN-950, manufactured by Aekyung Chemical Co., Ltd.)
광확산제 30.3중량부30.3 parts by weight of light diffusing agent
(테크폴리머 MBX-15, Sekisui사 제품)(Tech Polymer MBX-15, manufactured by Sekisui Corporation)
〈비교실시예 2〉<Comparative Example 2>
실시예1과 동일한 장치와 방법을 사용하되, 하기의 조성으로 체적 저항이 7.1X1013Ω㎝인 광확산 조성물을 제조하였으며, 광확산 필름 표면의 정전기 스팟 발생 여부를 평가하여 그 결과를 실시예 1과 함께 표 2에 나타내었다.Using the same apparatus and method as in Example 1, a light diffusion composition having a volume resistivity of 7.1 × 10 13 Ωcm was prepared using the following composition, and the result of evaluating the occurrence of an electrostatic spot on the surface of the light diffusion film was evaluated. It is shown in Table 2 with.
용제 41.4중량부Solvent 41.4 parts by weight
(톨루엔:크실렌=1:1, 체적 저항율 2.08X1013Ω㎝ )(Toluene: xylene = 1: 1, volume resistivity 2.08X10 13 Ωcm)
바인더 수지 25.4중량부25.4 parts by weight of binder resin
(아크리딕 DU-589, 애경화학사 제품, 고형분 55%)(Acridic DU-589, manufactured by Aekyung Chemical, 55% solids)
경화제 2.9중량부2.9 parts by weight of curing agent
(브루녹 DN-950, 애경화학사 제품)(Brunnock DN-950, manufactured by Aekyung Chemical Co., Ltd.)
광확산제 30.3중량부30.3 parts by weight of light diffusing agent
(테크폴리머 MBX-15, Sekisui사 제품)(Tech Polymer MBX-15, manufactured by Sekisui Corporation)
〈광확산 필름의 제조〉<Production of Light Diffusion Film>
그라비아 코팅기를 이용하여 SKC사의 100㎛ 두께의 폴리에틸렌테레프탈레이트 필름(SH71S)상에 실시예 1 내지 2와 비교실시예 1 내지 2 에서 제조된 광확산 조성물을 건조 도포량이 14g/㎡이 되도록 20m/분의 속도로 도포하고 100℃에서 건조하여 광확산 필름을 제조였다.20 m / min using a gravure coater on the 100 μm-thick polyethylene terephthalate film (SH71S) of the light diffusing composition prepared in Examples 1 to 2 and Comparative Examples 1 to 2 so that the dry coating amount was 14 g / m 2 It apply | coated at the speed of and dried at 100 degreeC, and produced the light-diffusion film.
〈평가 방법〉<Assessment Methods>
- 체적 저항-Volumetric resistance
동아전파사제 메고옴메터 (megohmmeter, 모델명 DSM 8103)를 사용하여 상온에서 전극 간 거리를 1.9㎝로 하여 체적저항을 측정하였다.Using a megohmmeter (model name DSM 8103) manufactured by Dong-A Radio Wave Co., Ltd., volume resistance was measured at room temperature with a distance of 1.9 cm between electrodes.
- 정전기 스팟-Electrostatic spot
건조가 왼료된 광확산 필름의 도포면을 육안으로 간측하여 새발모양 또는 타원형의 코팅 불양 유무를 평가하였다.The coated surface of the light-diffusion film, which was left to dry, was visually measured to evaluate the presence or absence of coating defects in the shape of birds or ovals.
- 평균 휘도 및 휘도 균일도Average luminance and luminance uniformity
액정 백라이트 유니트의 도광판상에 광확산 필름을 올려놓고 탑콘(TOPCON)사의 휘도계 BM-7를 사용하여 측정하였으며, 임의의 10군데 휘도값에 대하여 가장 높은 휘도값을 Lmax라고 하고 가장 낮은 휘도값을 Lmin라고 할때, 아래 수학식 1에 따라 휘도 균일도를 계산하였으며 휘도 균일도가 70% 이상일때를 양호한 것으로 판단하였다.A light diffusing film was placed on the light guide plate of the liquid crystal backlight unit and measured using TOPCON's luminance meter BM-7. The highest luminance value was Lmax and the lowest luminance value was measured for any of ten luminance values. When Lmin, luminance uniformity was calculated according to Equation 1 below, and it was judged that the luminance uniformity was good when 70% or more.
상기 본 발명의 결과로부터 알 수 있듯이, 본 발명에 따라 광확산 필름 조성물의 체적 저항율이 1X1012Ω㎝이하가 되도록 유기 용매의 체적 저항을 조절한 광확산 조성물(실시예 1 내지 2)의 경우에는 정전기 스팟이 발생하지 않고 휘도와 휘도 균일도가 우수한 것을 확인할 수 있었다.As can be seen from the results of the present invention, in the case of the light diffusion composition (Examples 1 to 2) in which the volume resistivity of the organic solvent is adjusted so that the volume resistivity of the light diffusion film composition is 1 × 10 12 Ωcm or less according to the present invention. It was confirmed that the luminance and luminance uniformity were excellent without generating an electrostatic spot.
이에 반해, 광확산 필름 조성물의 체적 저항율이 1X1012Ω㎝를 초과하는 비교실시예1 내지 2의 경우에는 정전기 스팟이 발생하고 휘도 특성이 떨어지며 휘도 균일도도 불량하여 각종 화상표시소자에 적용하기에 적합하지 않았다.On the contrary, in Comparative Examples 1 to 2 in which the volume resistivity of the light diffusing film composition exceeds 1 × 10 12 Ωcm, electrostatic spots are generated, luminance characteristics are deteriorated, and luminance uniformity is also poor, which is suitable for various image display devices. Did not do it.
본 발명에 의해 광확산 필름 조성물의 체적 저항율이 1X1012Ω㎝이하가 되도록 사용하는 유기용매의 체적저항율을 조절한 광확산 필름의 조성물은 정기기 스팟이 발생하지 않아 외관이 깨끗하고 휘도 특성및 휘도균일도가 우수하여 각종 화상표시소자에 적용하기에 적합하다.According to the present invention, the composition of the light-diffusion film in which the volume resistivity of the organic solvent used so that the volume resistivity of the light-diffusion film composition is 1 × 10 12 Ωcm or less does not generate periodic spots, resulting in a clean appearance and luminance characteristics and luminance. It is excellent in uniformity and suitable for application to various image display elements.
본 발명은 일 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 당해 기술분야에 통상의 지식을 지닌 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 것을 이해할 것이다.Although the present invention has been described with reference to one embodiment, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019990053544A KR20010048744A (en) | 1999-11-29 | 1999-11-29 | the Composition for the Light-Diffusing Film |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019990053544A KR20010048744A (en) | 1999-11-29 | 1999-11-29 | the Composition for the Light-Diffusing Film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100458376B1 (en) * | 2002-09-14 | 2004-11-26 | 병호 최 | Method of manufacturing binder for use in EL device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05333202A (en) * | 1992-06-03 | 1993-12-17 | Fuji Photo Film Co Ltd | Light diffusion plate |
| JPH0667003A (en) * | 1992-08-20 | 1994-03-11 | Fuji Photo Film Co Ltd | Light diffusion plate |
| JPH07174909A (en) * | 1993-10-27 | 1995-07-14 | Fuji Photo Film Co Ltd | Light diffusing plate |
| JPH09127314A (en) * | 1995-11-06 | 1997-05-16 | Kimoto & Co Ltd | Light-diffusing sheet |
| KR20040000500A (en) * | 2003-11-21 | 2004-01-03 | 에스케이씨 주식회사 | The light-diffusing film and composition for the same |
-
1999
- 1999-11-29 KR KR1019990053544A patent/KR20010048744A/en not_active Application Discontinuation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05333202A (en) * | 1992-06-03 | 1993-12-17 | Fuji Photo Film Co Ltd | Light diffusion plate |
| JPH0667003A (en) * | 1992-08-20 | 1994-03-11 | Fuji Photo Film Co Ltd | Light diffusion plate |
| JPH07174909A (en) * | 1993-10-27 | 1995-07-14 | Fuji Photo Film Co Ltd | Light diffusing plate |
| JPH09127314A (en) * | 1995-11-06 | 1997-05-16 | Kimoto & Co Ltd | Light-diffusing sheet |
| KR20040000500A (en) * | 2003-11-21 | 2004-01-03 | 에스케이씨 주식회사 | The light-diffusing film and composition for the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100458376B1 (en) * | 2002-09-14 | 2004-11-26 | 병호 최 | Method of manufacturing binder for use in EL device |
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