Patent ID: 6414730
Filing Date: 2002-07-02
Classification: G02F

Abstract:
A method for manufacturing a liquid crystal display device in which a plurality of switching elements are disposed in a matrix form on a substrate; a plurality of gate signal lines for controlling respective switching elements and a plurality of source signal lines for supplying data signals to respective switching elements are disposed perpendicularly to each other; an interlayer insulation film are formed to cover the switching elements, gate signal lines and source signal lines; and liquid crystal is encapsulated between an active matrix substrate in which a plurality of pixel electrodes are formed on the interlayer insulation film which pixel electrodes are connected to drain electrodes of respective switching elements and a counter substrate confronting the active matrix substrate, the method comprising:forming a low resistance metal film on metal drain extraction electrodes connected to the drain electrodes at one end thereof; forming an interlayer insulation film to cover the switching elements, gate signal lines, source signal lines and drain extraction electrodes; forming through holes in the interlayer insulation film to expose at least part of the periphery of the extraction electrodes at the other end thereof; performing wet etching to remove the low resistance metal film on the metal drain extraction electrodes exposed in the through holes; and forming pixel electrodes over the interlayer insulation film and extending through the through holes so as to contact the drain extraction electrodes from which the low resistance metal film has been removed.