Patent ID: 6169531
Filing Date: 2001-01-02
Classification: G09G

Abstract:
A display device comprising a number of display elements, which are arranged in rows and columns in accordance with a matrix, and comprising, between a first substrate and a second substrate, a liquid-crystal material which belongs to the group of smectic liquid-crystal materials, which include ferroelectric liquid-crystal material with deformable helix, ferroelectric liquid-crystal material with twisted smectic structure, monostable ferroelectric liquid-crystal material, electroclinic smectic A liquid-crystal material and anti-ferroelectric liquid-crystal material, and comprising a group of row electrodes and a group of column electrodes, each pixel including, on at least one substrate, a picture electrode which is connected to a column electrode or row electrode via an active switching element, and said display device comprising means for applying selection voltages to the row electrodes and data voltages to the column electrodes, characterized in that the display device comprises a control circuit which, during a first part of a line-selection time, provides a first number of successive row electrodes with a selection signal for the purpose of reset and which, during a corresponding part of a subsequent line-selection time, provides a second number of successive row electrodes, but shifted by at least one row position, with a selection signal for the purpose of reset and which, during another part of a line-selection time, provides one or two row electrodes with a selection signal for the purpose of writing data and which provides the column electrodes with data signals.