Siemens Aktiengesellschaft

Michael M&auml;rz

Klaus Wammes

In an active matrix liquid crystal display, pixels are arranged in rows and columns of a matrix and are controllable via row electrodes and column electrodes. To improve and to expand the possibilities of image rendering without increasing the number of rows and columns to be controlled, the pixels are divided into sub-pixels with corresponding sub-pixel electrodes, each of which is connected to the column electrode assigned to the pixel via controllable switches. On the control side, the controllable switches are connected to the row electrode assigned to the pixel via pixel control unit which is common to them. From a control signal supplied to it via the row electrode the pixel control unit generates locally and chronologically different turn-on signals for the various switches so that they switch chronologically successive different gray-scale levels of a gray-scale signal present at the column electrode through to the sub-pixel electrodes.

Active matrix liquid crystal display

In an active matrix liquid crystal display having liquid crystal cells arranged in rows and columns. One side of the liquid crystal cells is in contact with a common reference potential and it being possible to switch gray-scale signals through on the other side. In order to increase the voltage range within which the liquid crystal cells can be operated without distortion of the image rendering, a correction device is provided which distorts the gray-scale signals reaching the liquid crystal cell based on information concerning the typical dependence between the optical transparence of the liquid crystal cells and the voltage applied to them and as a function the potential difference between the gray-scale signals and the reference potential in such a way that an at least approximately linear relationship results between the optical transparence of the liquid crystal cells and the undistorted gray-scale signals.

Growing community of inventors

Steinbach, Germany

Michael März

Growing community of inventors

Steinbach, Germany

Michael M&auml;rz

Michael März