Patent ID: 6433765
Filing Date: 2002-08-13
Classification: G09G

Abstract:
A liquid crystal display of the present invention, comprising:a pixel substrate; an opposing substrate aligned face to face with the pixel substrate with a gap in between; a liquid crystal layer that is sandwiched in the gap between the pixel substrate and the opposing substrate; a plurality of pixel electrodes formed on the pixel substrate in a matrix format; opposing electrodes formed on the opposing substrate in association with the pixel electrodes; a plurality of scanning lines and a plurality of reference signal lines that are placed in parallel with each other in each of the border areas between the pixel electrodes on the pixel substrate; a gradation signal line that is placed in a direction orthogonal to the scanning lines on the opposing substrate and that is electrically connected to the opposing electrodes; and a switching element of a three-terminal type having respective terminals electrically connected to the scanning line, the reference signal line and the pixel electrode on the pixel substrate, is characterized by further comprising: a reference signal main line that is placed so as to electrically connect the reference signal lines with each other on the periphery of the area in which the reference signal lines are placed; and a voltage applying circuit for applying a reference signal voltage to a reference signal circuit constituted by the reference signal lines and the reference signal main line, and for controlling the applying voltage in response to voltage variations in the reference signal circuit, wherein: the reference signal main line includes an input main line and an output main line, the input main line and the output main line being electrically connected to each other through the reference signal line, with their portions other than the connected portions through the reference signal line being in an electrically insulated state or in a high impedance state, and an input section for applying a voltage from the voltage applying circuit is placed in the input main line and an output section for feeding a voltage back to the voltage applying circuit is placed in the output main line.