New Switchable Transmissive/Reflective LCD Mode Device

  • Kim, Yeon-Ji (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Heo, Hong-Seok (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Ko, Jeong-Hoon (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Kim, Jin-Ho (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Choi, Sang-Ho (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Jeon, Il (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Hwang, Seong-Han (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Lee, Joun-Ho (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Kim, Kyeong-Jin (Notebook Product Development Department, LG Display Co., Ltd.) ;
  • Choi, Hyun-Chul (Notebook Product Development Department, LG Display Co., Ltd.)
  • Published : 2009.10.12

Abstract

We have developed new type of LCD Device which enables switching from reflective to tranmissive LCD mode and vice versa according to brightness of the surrounding. Alternation in these modes are possible by adding on circular polarized sheet and retardation film onto the bottom polarizer which allows the control of the back light and the LCD cell gamma voltage depending on the atmosphere. This method has been evaluated and confirmed by running on the LCD module device in which we have optimized retardation value by Poincare polarizer analysis.