Control unit for a segment liquid crystal display and a method thereof

Abstract

A unit () used to control a segment liquid crystal display (). The segment liquid crystal display () includes at least a backplane electrode () and at least a front plane electrode () both associated with a same segment of the segment liquid crystal display (). The unit () includes a controller () in order to generate a pulse-width-modulated control signal () that has two voltage levels and a variable duty cycle. The unit () further includes an integrator () to integrate the pulse-width-modulated control signal () and to provide an integrated control signal () which has more than two discrete voltage levels corresponding to different variable duty cycle values. An output of the unit () supplies the integrated control signal () to the at least a backplane electrode () or to the at least a front plane electrode () so that visibility of the same segment in the segment liquid crystal display () can be controlled. By having a pulse-width-modulated control signal () with only two voltage levels and different duty cycle values generated by the controller (), and by having the integrator () integrating said pulse-width-modulated control signal (), more than two different discrete voltage levels are generated to control the at least a backplane electrode () or at least a front plane electrode () without the need to use an application specific segment liquid crystal interface in the unit (), thereby abating the cost of implementation of the unit ().