least about 30 by weight of the dispersion medium the thus constituted dispersion medium improves the reliability and response of the electrophoretic device the organic compound comprises one or more of the materials defined by the structural formulae to wherein each of a1 to a6 c1 and c2 are ring compounds application_number US 9736102 A description the preferred embodiments of the present invention are described below with reference to the accompanying figures an electrophoretic display system according to embodiments of the invention comprises an electrophoretic display panel and peripheral circuitry however because the distinguishing feature of the present invention is the suspension used in the electrophoretic display panel the peripheral circuitry is not described below an electrophoretic display panel according to embodiments of the invention is described below with reference to fig1 and fig2 display panel a has a component substrate 100 with an opposing substrate 200 disposed in opposition thereto and a cell grid 11 disposed between the substrates fig1 is an oblique view showing the opposing substrate 200 removed and raised above the component substrate 100 and fig2 is a partial section view a common electrode 201 and then a sealant layer 202 are formed on the surface of the substrate 200 that is opposite the component substrate 100 the opposing substrate 200 common electrode 201 and sealant layer 202 are all transparent and the outside of the opposing substrate 200 is the display surface the viewing side of display panel a pixel electrodes 104 scan lines data lines 102 and thin film transistors functioning as switching elements are formed in the center display area 100 a of the component substrate 100 on the surface opposing.