公开(公告)号：JPH11109893A

公开(公告)日：1999-04-23

申请号：JP24497797

申请日：1997-09-10

Applicant: IBM

Inventor： FUKUZAWA TADASHI ,  SHIOTANI SHIGEO

IPC: G02F1/1335 ,  C09K11/56 ,  C09K11/73 ,  C09K11/78 ,  C09K11/79 ,  G02F1/133 ,  G02F1/13357 ,  G09F9/00 ,  G09F9/35

Abstract: PROBLEM TO BE SOLVED: To obtain an excellent color rendering property (color reproducibility) and high response characteristic with a high efficiency by time-serially illuminating liquid crystals by using cold cathode discharge tubes coated with phosphors of red, green and blue. SOLUTION: The cold cathode discharge tubes 25, 26, 27 of red, green and blue having excellent high-speed transient characteristics are used. A screen corresponding to data of red is first written to the liquid crystal screen over the entire part of the display device. The red cold cathode discharge tube 25 lights after the end of the writing and puts out after the red screen lasts for a specified time. The screen corresponding to data of green is then written to the liquid crystal screen. The green cold cathode discharge tube 26 lights after the completion. The writing and the illumination are thereafter repeated in time serially with the blue, red and green. (SrMg)3 (PO4 )2 : Sn is used for the red regions, Y3 Al3 Ga2 O12 : Ce for the green regions and Y2 SiO5 : Ce for the blue regions as the phosphors to be applied on the cold cathode discharge tubes 25, 26, 27.