Patent ID: 7924412

Claim:
A method of determining characteristics of an electrophoretic display medium, comprising: arranging the electrophoretic display medium in a cell located between conductive substrates, changing between a rectangular or triangular waveform to apply switching voltage to the electrophoretic display medium in the cell, and measuring at least reflectance of the electrophoretic display medium and transient current of the electrophoretic display medium, when selecting the rectangular waveform to apply switching voltage, characteristics of the electrophoretic display medium determined consist of white reflectance, black reflectance, contrast ratio, switching voltage, switching time, switching voltage threshold, mobility of particles, and charge of particles, and when selecting the triangular waveform to apply switching voltage, characteristics of the electrophoretic display medium determined consist of white reflectance, black reflectance, contrast ratio, mobility of particles, charge of particles, and charge distribution.