㻝㼏㻜㻞 ᪂つ࡞ග㓄ྥ⭷ࢆ⏝࠸ࡓᾮᬗ㓄ྥไᚚ (ᮾி㎰ᕤ㝔ᕤ)ۑୖ⩧ྐ࣭ᯇᒣ▱๛࣭㣤ᮧ㟹ᩥ Control of LC Orientation on New Photo-alignment Film Shoji Inoue, Takanori Matsuyama, Yasufumi Iimura Department of Electrical and Electronic Engineering, Graduate school of Engineering, Tokyo University of A&T, 2-24-16 Naka-cho, Koganei-shi 184-8588, Japan Recently, a photo-alignment (PA) method attracts people’s interest due to its noncontact and dust-free natures. But the weakness of the anchoring energy in a PA method impedes the application of the method to LCD production processes. In this report, we focus our attention to developing a PA method for IPS-LCDs, in which we use a newly developed photo-alignment material showing liquid crystalline and photo-sensitive properties. The results show that the PA material needs extra low UV exposure energy, which is due to a liquid crystalline nature of the material. ࠙⥴ゝࠚ ⌧ᅾⷧᆺࢹࢫࣉࣞ࠾࠸࡚㸪ᾮᬗࢹࢫࣉࣞ㸦LCD㸧ࡢ༨ࡵࡿ⨨ࡀ㠀ᖖࡁࡃ࡞ࡗ࡚࠸ࡿࠋࡇࡢ LCD ࡢ୰࡛ࡶ IPS ⾲♧࣮ࣔࢻࡣ㸪ࡑࡢ⾲♧ရࡀඃࢀ࡚࠸ࡿࡇࡽᦠᖏ⏝ᑠᆺ➃ᮎࡽᆺ TV ⮳ࡿࡲ࡛ᗈࡃᛂ ⏝ࡉࢀ࡚࠸ࡿࠋ᪥㸪VA ⾲♧࣮ࣔࢻࡢග㓄ྥไᚚᢏ⾡ࡢ㐺⏝ࡀ⾜ࢃࢀ㸪ࡇࡢග㓄ྥᢏ⾡ࡢ IPS ⾲♧࣮ࣔࢻࡢ 㐺⏝ࡀᙉࡃᮇᚅࡉࢀࡿࡼ࠺࡞ࡗ࡚࠸ࡿࠋ୍⯡㸪VA ࣮ࣔࢻẚ㍑ࡋ࡚ IPS ࣮ࣔࢻ࠾࠸࡚ࡣ㸪ࡑࡢ㓄ྥつไຊ ࡢࡁࡉࡀᙉ࠸ࡀᚲ㡲࡛࠶ࡾ㸪ࡇࡢࡓࡵᙉࣥ࢝ࣜࣥࢢࢆᐇ⌧ࡍࡿ᪂つ࡞㓄ྥ⭷ᮦᩱࡢ㛤Ⓨࡀᚲせ࡛࠶ࡿࠋ ᮏ◊✲࡛ࡣ IPS ࣮ࣔࢻࡢග㓄ྥไᚚᢏ⾡ࡢ㐺⏝ࢆ┠ᣦࡋ࡚㸪᪂つ࡞ගᛂᆺᾮᬗᛶ㓄ྥ⭷ᮦᩱࡢ᳨ウࢆ⾜ࡗ ࡓࡢ࡛ሗ࿌ࡍࡿࠋ ࠙ᐇ㦂ཬࡧ⤖ᯝࠚ ᮏ◊✲࡛⏝ࡋࡓ㓄ྥ⭷㸦PA-011A㸧ࡣ㸪ࢩࣥࢼ࣓࣮ࢺᇶࢆྵࡴᾮᬗᛶࣔࣀ࣐࣮ࡽ࡞ࡿᮦᩱ࡛࠶ࡿࠋࡇࡢᮦ ᩱࡣ UV ྾␗᪉ᛶࡀ࠶ࡾ㸪ࡑࡢࡓࡵ೫ග UV ↷ᑕࡼࡾ≉ᐃࡢ㓄ྥ᪉ࢆᣢࡘศᏊࢆගᛂ㸦␗ᛶᛂཬ ࡧ㔞ᛂ㸧ࡉࡏࡿࡀ࡛ࡁࡿࠋࡑࡢ⤖ᯝ㸪UV p polarized UV ↷ᑕᚋࡢ⇕ฎ⌮࡛⮬ᕫ⤌⧊㸦ᾮᬗᛶࡢࡓࡵ㸧ࡀ㉳ ࡇࡾ㸪㓄ྥ⭷ගᏛⓗ␗᪉ᛶࡀⓎ⏕ࡍࡿ㸦Fig.1㸧ࠋ ලయⓗ࡞㓄ྥฎ⌮ᡭ㡰ࡣ㸪௨ୗࡢࡼ࠺࡛࠶ࡿࠋITO Thermal process ࣋ࢱᇶᯈගᛂᆺᾮᬗᛶ㓄ྥ⭷ᮦᩱࢆሬᕸࡋ㸪௬ ↝ᡂ(80Υ2min)㸪p ೫ග UV ↷ᑕ(313nm㸪30㹼 150mJ/cm2)ᚋ㸪ᮏ↝ᡂ(110㹼150Υ5min)ࢆ⾜࠺ࠋ ᾮᬗࡣ㸪㈇ࡢㄏ㟁␗᪉ᛶࢆ᭷ࡍࡿ MLC-2038 ࢆ⏝ ࠸ࡓࠋࡲࡎ㸪p ೫ග UV ↷ᑕ㔞ࢆ 30mJ/cm2 ࡛ᅛᐃ Fig.1 UV Treatment Process Fig.1 UV Treatment Process UV 1mm 1mm 1mm 110Υ 130Υ 150Υ Fig.2 LC Alignment Textures on UV treated PA-011 annealed at 110, 130 and 150Υ. 1mm 1mm 1mm 30mJ/cm2 90 mJ/cm2 150 mJ/cm2 Fig.3 LC Alignment Textures on UV-exposed PA-011 of 30, 90 and 150mJ/cm 2 ࡋ㸪㓄ྥ⭷୰ࡢᾮᬗᛶࣔࣀ࣐࣮ࡢ⮬ᕫ⤌⧊ࢆ⾜࠺ ᗘ㸦ᮏ↝ᡂ ᗘ㸧ࢆ 110㸪130㸪150Υኚ࠼ࡓሙྜࡢ㓄ྥ ≧ែࡢኚࢆほ ࡋࡓࠋFig.2 ♧ࡍࡼ࠺㸪130Υࡼࡾ㧗࠸ᮏ↝ᡂ ᗘ࡛ࡣ㓄ྥ≧ែࡀࢀࡿ⤖ᯝ࡞ࡗࡓࠋࡇ ࢀࡣ㸪150Υ࡛ࡣᾮᬗᛶ㓄ྥ⭷ࡀ➼᪉≧ែ࡞ࡗ࡚࠸ࡿࡓࡵ⪃࠼ࡽࢀࡿࠋᚑࡗ࡚㸪೫ග UV ↷ᑕᚋࡢ⮬ᕫ⤌⧊ ࢆ⾜࠺ ᗘࡣ 130Υ௨ୗࡀࡼ࠸ࡀศࡗࡓࠋ ḟ㸪೫ග UV ↷ᑕ㔞ࡢ㐪࠸ࡼࡿ㸪ᾮᬗ㓄ྥ≧ែࡢኚࢆㄪࡓࠋ㓄ྥ⭷୰ࡢᾮᬗᛶࣔࣀ࣐࣮ࡢ⮬ᕫ⤌⧊ ࢆ⾜࠺ ᗘ㸦ᮏ↝ᡂ ᗘ㸧ࢆ 110Υᅛᐃࡋ㸪UV ↷ᑕ㔞ࢆ 30㸪90㸪150 mJ/cm2 ኚ࠼ࡓሙྜࡢ㓄ྥ≧ែࡢኚ ࢆほ ࡋࡓ⤖ᯝࢆ Fig.3 ♧ࡍࠋUV ↷ᑕ㔞ࡀᙉࡍࡂࡿ㸦150 mJ/cm2㸧ᾮᬗ㓄ྥ≧ែࡢᝏࡀほ ࡉࢀ㸪ࡇࢀ ࡣග␗ᛶග㔞ࡢྜࡀኚࡋࡓࡓࡵ⪃࠼ࡽࢀࡿࠋ ୖグࡢᐇ㦂⤖ᯝࡼࡾ㸪UV 㟢ග㔞ࢆ 30㸪70㸪90㹫J/cm2㸪ᮏ↝ᡂ ᗘࢆ 110Υࡋ࡚㸪ග㓄ྥἲ࡛స〇ࡋࡓᾮᬗࢭࣝࡢ㟁Ⲵಖᣢ≉ᛶ 㓄ྥ⭷㸦RN-1349㸧ࢆ⏝࠸ࡓሙྜࡢ VHR ≉ᛶࡶホ౯ࡋࡓࠋFig.4 ࡢ ⤖ᯝࡼࡾ㸪ࡍ࡚ࡢࢧࣥࣉࣝ࠾࠸࡚㸪 ᐃ ᗘࡢୖ᪼ᚑ࠸ VHR 9+5 㸦VHR㸧ࡢ ᐃࢆ⾜ࡗࡓࠋẚ㍑ࡢࡓࡵ㸪ࣛࣅࣥࢢ㓄ྥฎ⌮ࡋࡓỈᖹ P-FP P-FP ࡀᝏࡍࡿࡀศࡿࠋࣜࣇࣞࣥࢫࢧࣥࣉࣝࡢẚ㍑ࡼࡾ㸪ග㓄ྥ P-FP ࢧࣥࣉࣝࡢ VHR ≉ᛶࡣ࡞ࡾຎࡗ࡚࠸ࡿࡀศࡿࠋ≉㸪೫ග UV ↷ᑕ㔞ࡀᑡ࡞࠸ࢧࣥࣉࣝ㸦30㹫J/cm2㸧࡛ࡣࡑࡢഴྥࡀ㢧ⴭ࡛࠶ 51 7HPSHUDWXUHΥ ࡿࠋࡇࡢ VHR ࡢ UV ↷ᑕ㔞ᑐࡍࡿ⤖ᯝࡘ࠸࡚ࡣ㸪UV ↷ᑕ࡛ṧ Fig.4 Voltage Holding Ratios ࡗࡓᮍᛂࡢศᏊࡀ㟁Ⲵಖᣢ≉ᛶᝏࡢཎᅉ⪃࠼ࡽࢀࡿࠋ ࠙ࡲࡵࠚ ᵝࠎ࡞᮲௳࡛᪂つ࡞ග㓄ྥ⭷ᮦᩱࡢฎ⌮ࢆ⾜࠸㸪ࡑࡢ⭷ୖ࡛ࡢᾮᬗ㓄ྥ≉ᛶࢆㄪࡓࠋࡑࡢ⤖ᯝ㸪ࡇࡢ㓄ྥ⭷ ᮦᩱࡣ㸪೫ග UV ↷ᑕ㔞ࡀ㠀ᖖᑡ࡞ࡃ࡚ࡶ༑ศᾮᬗศᏊࢆ㓄ྥࡉࡏࡿ⬟ຊࡀ࠶ࡿࡀศࡗࡓࠋࡋࡋ࡞ࡀࡽ VHR ≉ᛶࡲࡔၥ㢟ࡀ࠶ࡾ㸪ࡇࡢᨵၿࡀᚲせ࡛࠶ࡿࠋ ࿒ষͅ࿗ͥ
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