DISPLAY DEVICE HAVING REDUCED POWER CONSUMPTION

摘要

The present invention concerns generally passive matrix displays, in particular a device comprising a display arrangement (1) and a display driver circuit (2). The display arrangement (1) comprises a liquid crystal material between a first substrate provided with row electrodes (7) and a second substrate provided with column electrodes (6), in which overlapping parts of the row and column electrodes define pixels (8). The display driver circuit (2) comprises means (5) for driving the column electrodes (6) and means (4) for driving the row electrodes (7). The row electrodes (7) supply groups of p rows (p>=2) with row selection voltage levels (V3, VC, MV3) for selecting rows and the column voltage levels (V2, V1, VC, MV1, MV2) are provided by means (5) for driving the column electrodes (6). The column voltage levels (V2, V1, VC, MV1, MV2) to be supplied to the column electrodes (6) are selectable from p+l different column voltage levels (V2, V1, VC, MV1, MV2) depending on the image data to be displayed, wherein the column voltage levels (V2, V1, VC, MV1, MV2) are symmetrically distributed around a middle voltage level (VC). To provide a display device having a low power consumption it is proposed to connect the middle voltage level (VC) in dependency on a deviation from a predetermined value of the middle voltage level (VC) with a higher (Vsupplyl) or a lower voltage potential (VSS) until the predetermined value of the middle voltage level (VC) is reached or the middle voltage level (VC) stays within a tolerance range.