Electrophoretic display devices
Abstract
The use of electrophoresis for display devices is a recent idea that is being investigated by several groups of research workers. The paper describes the principle of operation of such a device, discusses its optical characteristics and then justifies the selection of TiO2 as the pigment. Floculation and sedimentation can affect solution stability. This problem is analyzed, the action of surfactants which form monomolecular layers at the solid-liquid interfaces is described, and the necessity of matching grain and liquid densities is explained. Hydrodynamic instability phenomena are discussed, and it is explained why a compromise is required between response time and display area homogeneity. Finally, the behavior of these devices when considered as electronic components is discussed, and presently obtainable performance figures are given; operating voltage of 100 V; power consumption of 20 microjoules/sq cm/switching operation; response time of 100 ms; contrast ratio of 20:1.
- Publication:
-
L'Onde Electrique
- Pub Date:
- October 1979
- Bibcode:
- 1979LOEle..59R..65P
- Keywords:
-
- Display Devices;
- Electrohydrodynamics;
- Electrophoresis;
- Flow Stability;
- Liquid-Solid Interfaces;
- Optical Properties;
- Response Time (Computers);
- Titanium Oxides;
- Two Phase Flow;
- Instrumentation and Photography