Modeling of Refreshing Rate and its Parametric Analysis of a Multi-lines Braille Display using Electrorheological Valves Matrix

The refreshing rate of a multi-lines Braille display using electrorheological (ER) valves matrix plays a very important role to meet the demands of reading experiences of visual impaired people, a lower refreshing rate of Braille dots which is less than the reading rate of visual impaired people will stop them from using the Braille display and let them learn knowledge by listening. The refreshing rate is governed by the rate of flow of an ER valve which was used to be an actuator of the corresponding Braille dot. A mathematical model of the refreshing rate was established to learn the effects of the critical parameters of the ER valve on the rate of flow of the ER valve which is equivalent to the refreshing rate of the Braille display in this paper. The results show that to meet the demand of refreshing rate for visual impaired people, the governed voltages of ER valves should be higher than 1kV. The minimum value of operational governed voltages of an ER valve will decrease when higher tolerances were exploited to the parameters of channel of an ER valve. These results may provide some suggestions to design of an ER valve.