公开(公告)号：JPH08221012A

公开(公告)日：1996-08-30

申请号：JP33075395

申请日：1995-12-19

Applicant: IBM

Inventor： JIYOZEFU GUROOBAA GOODON SEKAN ,  MAAKU UITSUTONII HAATO ,  ANDORIYUU MARIAN HOMORA ,  DENISU RICHIYAADO MATSUKIIN ,  ROORENSU BURAIAN SHIEIN ,  BAATON AREN SUMISU ,  SARII AN SUWANSON

IPC: G09F9/37 ,  G02F1/167

Abstract: PROBLEM TO BE SOLVED: To provide an improved electromotive display device having a low power consumption quantity and a good image contrast by providing a counter electrode and a panel having a light reflecting or light absorbing surface on a light transmitting front window and a collective electrode, and providing a plurality of cells containing a light transmitting liquid suspension of charged pigment particles. SOLUTION: Multiple cells containing a light transmitting liquid suspension of charged pigment particles are provided. Each cell contains a front transmitting counter electrode 2 (serving as a front window), a horizontal back panel 4 having a light refrective or light absorptive surface 6 facing the electrode 2 and a collective electrode 8 arranged apart from the front electrode 2 in the cell and becoming no obstacle. A suspension 10 of a colloidal pigment is arranged in the space between the front electrode 2 and a back panel 4. The back panel 4 covers almost all the horizontal (lateral) region of the cell. Pigment electrons are collected on the non-obstructive collective electrode 8 in the preferable state, and the ambient light is reflected on the back panel 4 and can be returned to an observer. The cell is operated with no continuous artificial electric light source (e.g. a back-light).