백라이트 유니트 구성요소가 TFT-LCD TV용 광확산필름의 전기, 광학적 특성에 미치는 영향

안철흥; 김건중; Cheol-Heung Ahn; Geon-Joong Kim

Journal of the Korean Industrial and Engineering Chemistry, Vol.17, No.4, 397-402, August, 2006

Export Citation

백라이트 유니트 구성요소가 TFT-LCD TV용 광확산필름의 전기, 광학적 특성에 미치는 영향

Effect of BLU Ingredient on Electrical and Optical Properties of Light Diffusing Film used for TFT-LCD TV

안철흥, 김건중 ^†

인하대학교 화학공학과

Cheol-Heung Ahn, and Geon-Joong Kim^†

Department of Chemical Engineering, Inha University, Incheon 402-751, Korea

E-mail:

초록

TFT-LCD TV용 백라이트 유니트(BLU)의 각 구성성분이 최종 광확산필름의 물리적, 전기적, 열적, 광학적 특성에 미치 는 영향에 관하여 고찰하였다. 블로킹 방지층에 있어서는 6 μm의 아크릴 비드를 0.5～1.5 wt%로 첨가했을 때 블로킹 방지성이 우수하였고, 4급 암모니움 염을 0.8 wt%로 첨가하였을 경우 Decay-Time 및 수분에 대한 안정성이 가장 우수한 결과를 나타내었다. 광확산층에 있어서는 아크릴 폴리올을 바인더 수지로서 사용하고, 무황변 타입의 HDI계 경화제를 바인더 수지에 대해 30～35 wt%로 첨가하였을 경우가 PET 필름 표면상에의 접착력, 경화속도 및 유연성 측면에서 가장 우수한 결과를 보였다. 또한 20 μm의 다분산형 폴리스티렌(20 μm PS) 및 폴리메틸메타크릴레이트(20 μm PMMA) 비드를 바인더 수지 대비 250 wt%로 첨가하였을 경우에 가장 높은 법선휘도값을 얻을 수 있었으며, PS 입자를 사용했을 경우보다는 PMMA 입자를 사용했을 경우가 투과율 차이로 인해 더 높은 법선휘도값을 나타내었다.

We have investigated the effect of each ingredient in the light diffusing film (LDF) which was used as backlight unit (BLU) of TFT-LCD TV on physical, electrical, thermal and optical properties of LDF. In anti-blocking layer, the excellent anti-blocking ability was obtained when 0.5～1.5 wt% of acrylic bead was added, and good decay-time and water-stability were shown when 0.8 wt% of tertiary ammonium salt was added. Optimal results for adhesion strength, curing rates and flexibility on the surface of PET film have been obtained in the light diffusing layer by using acrylic polyol as a binder resin, and by addition of 30～35 wt% non-yellowing type HDI crosslinker. In addition, the highest normal luminance value was obtained by addition of 250 wt% poly-dispersive polystyrene (20 μm PS) and polymethylmethacrylate (20 μm PMMA) beads into the binder resin (100 wt%). The higher normal luminance could be got for PMMA beads than PS beads because of the transmittance difference.

Keywords:light diffusing film;anti-blocking;luminance;PET

[References]

Doane JW, in Liquid Crystals-Applications and Uses, 1, 361 (1990)
Horibe A, Bada M, Nihei E, Koike Y, SID 98 Digest, 153 (1998)
Tahaya A, Nagai M, Koike Y, Yokoyama K, Appl. Optics, 40, 6274 (2001)
tagaya A, Ishii S, Yokoyama K, Higuchi E, Koide Y, J. Appl. Phys. Jpn, 41, 2241 (2002)
Suzuki H, Horiguchi M, Okumura T, Tagaya A, Koide Y, Proceeding Asia Display/IDW ’03, 673 (2003)
Ravindranath K, Mashelkar RA, Chem. Eng. Sci., 42, 2197 (1986)
Heffelfinger CJ, Knox KL, The Science and Technology of Polymer Films, Wiley-Interscience, New York, 587 (1971)
Ravindranath K, Mashelkar RA, Developments in Plastic Technology 2, Elsevier Applied Science, London (1985)
Yoda K, Dogyo Kagoku Zashi, 74, 1476 (1971)
Stevenson RW, J. Polym. Sci., 7, 395 (1969)
Maerov SB, J. Polym. Sci. Polym., 7, 4033 (1979)
Tomita K, Kobunshi Rombunshu, 34, 675 (1977)
Tseng CM, Lu YY, El-aasser MS, Vanderhoff JW, J. Polym. Sci. A: Polym. Chem. Ed., 24, 2995 (1986)
Walbridge DJ, Comprehensive Polymer Science, 4, 243 (1989)
Dawkins JV, Comprehensive Polymer Science, 4, 231 (1989)
Okubo M, Polym. Int., 30, 469 (1993)
Ugelstad J, Kaggerud KH, Hansen FK, Makromol. Chem., 180, 737 (1979)
Hattori et al., European Patent Application,, 190, 886 (1986)
Hayashi S, Komatsu A, Hirai T, J. Polym. Sci., 27, 157 (1989)

[Related Articles]

[1] Doane JW, in Liquid Crystals-Applications and Uses, 1, 361 (1990)

[2] Horibe A, Bada M, Nihei E, Koike Y, SID 98 Digest, 153 (1998)

[3] Tahaya A, Nagai M, Koike Y, Yokoyama K, Appl. Optics, 40, 6274 (2001)

[4] tagaya A, Ishii S, Yokoyama K, Higuchi E, Koide Y, J. Appl. Phys. Jpn, 41, 2241 (2002)

[5] Suzuki H, Horiguchi M, Okumura T, Tagaya A, Koide Y, Proceeding Asia Display/IDW ’03, 673 (2003)

[6] Ravindranath K, Mashelkar RA, Chem. Eng. Sci., 42, 2197 (1986)

[7] Heffelfinger CJ, Knox KL, The Science and Technology of Polymer Films, Wiley-Interscience, New York, 587 (1971)

[8] Ravindranath K, Mashelkar RA, Developments in Plastic Technology 2, Elsevier Applied Science, London (1985)

[9] Yoda K, Dogyo Kagoku Zashi, 74, 1476 (1971)

[10] Stevenson RW, J. Polym. Sci., 7, 395 (1969)

[11] Maerov SB, J. Polym. Sci. Polym., 7, 4033 (1979)

[12] Tomita K, Kobunshi Rombunshu, 34, 675 (1977)

[13] Tseng CM, Lu YY, El-aasser MS, Vanderhoff JW, J. Polym. Sci. A: Polym. Chem. Ed., 24, 2995 (1986)

[14] Walbridge DJ, Comprehensive Polymer Science, 4, 243 (1989)

[15] Dawkins JV, Comprehensive Polymer Science, 4, 231 (1989)

[16] Okubo M, Polym. Int., 30, 469 (1993)

[17] Ugelstad J, Kaggerud KH, Hansen FK, Makromol. Chem., 180, 737 (1979)

[18] Hattori et al., European Patent Application,, 190, 886 (1986)

[19] Hayashi S, Komatsu A, Hirai T, J. Polym. Sci., 27, 157 (1989)