Method of forming liquid crystal display device with molybdenum shading layer over ITO electrodes

Claim 1

A method of forming a liquid crystal display device having improved brightness contrast between a matrix of pixel areas and areas of the device other than the pixel areas, comprising the steps of: providing two light transmissive substrates formed of glass; applying a transparent film of conductive material on a surface of each substrate, said conductive material being formed of indium tin oxide; applying to the conductive material on each substrate a material for forming a shading layer, said shading layer material comprising molybdenum; removing portions of said shading layer material and said film of conductive material on each substrate to form a plurality of shading layer segments and a plurality of electrodes with the shading layer segments overlying respective portions of the electrodes; applying an insulating layer over said shading layer segments and said electrodes; securing said substrate in opposition to each other with the electrodes and the shading layer segments of each substrate forming pixel areas and areas other than pixel areas shaded by said shading layer segments whereby said shading layer segments inhibit penetration of light into and afford uniform brightness in said other areas upon operation of the device; and disposing ferroelectric liquid crystals in the space between said substrates; the step of removing portions of said shading layer molybdenum material including etching said molybdenum material portion with a phosphoric acid etchant and the step of removing portions of said indium tin oxide including etching said indium tin oxide with a hydrochloric acid etchant.

Claim 2

A method of forming a liquid crystal display device having improved brightness contrast between a matrix of pixel areas and areas of the device other than the pixel areas, comprising the steps of: providing two light transmissive substrates formed of glass; applying a transparent film of conductive material on a surface of each substrate, said conductive material being formed of indium tin oxide; applying to the conductive material on each substrate a material for forming a shading layer, said shading layer material comprising molybdenum; removing portions of said shading layer material and said film of conductive material on each substrate to form a plurality of shading layer segments and a plurality of electrodes with the shading layer segments overlying respective portions of the electrodes; applying an insulating layer over said shading layer segments and said electrodes; securing said substrate in opposition to each other with the electrodes and the shading layer segments of each substrate forming pixel areas and areas other than pixel areas shaded by said shading layer segments whereby said shading layer segments inhibit penetration of light into and afford uniform brightness in said other areas upon operation of the device; and disposing ferroelectric liquid crystals in the space between said substrates; the step of removing portions of said shading layer molybdenum material including etching said molybdenum material portion with a phosphoric acid etchant and the step of removing portions of said indium tin oxide including etching said indium tin oxide with a hydrochloric acid etchant.