Active matrix LCD with increased aperture ratio for improved display - includes ring shaped storage capacitance electrode, within each pixel region and surrounding pixel electrode, and driven independent of scanning and display electrodes

摘要

The LCD includes scanning signal lines and intersecting display signal lines, arranged in a matrix, on a surface of a transparent substrate, to define pixel regions, each bounded by a pair of scanning signal lines and a pair of display signal lines. There is a pixel electrode in each pixel region, and a switching TFT in each pixel region, connected with a corresponding display signal line and the pixel electrode. A ring-shaped electrode within each pixel region faces and surrounds the corresp. pixel electrode, to form a storage capacitance with the pixel electrode. - The ring electrodes of adjacent pixels are connected to each other by wiring interconnect(s), and the electrodes are driven independently from the scanning lines and the display signal lines. The interconnect may cross the display signal lines, electrically isolated by an insulating layer. Pref. the storage capacitors' ring electrodes are of the same material as a bonding pad connecting the scanning signal lines and the display signal lines to an external driving circuit and are simultaneously patterned when forming the bonding pad. The TFT source electrode may overlie part of the storage capacitance ring electrode.