Liquid crystal display device with minimum ohmic contact between reflective and transparent electrodes
View Patent ↗An LCD device and a method for manufacturing the same are disclosed, wherein it is possible to reduce an ohmic contact between a reflective electrode and a transparent electrode and to simplify process steps. In the LCD device having first and second substrates and a liquid crystal layer between the first and second substrates, the LCD device includes a gate electrode and a first electrode of a storage capacitor on the first substrate; a first insulating film on the entire surface of the first substrate including the gate electrode; a semiconductor film, source/drain electrodes and a second electrode of the storage capacitor on the first insulating film; a second insulating film on the first insulating film including the source/drain electrodes; a reflective electrode on the second insulating film to connect the drain electrode with the second electrode of the storage capacitor; and a transparent electrode connected with the drain electrode on a third insulating film formed on the second insulating film including the reflective electrode.
1. A method of producing a display device, the method comprising the steps of:
forming a source/drain electrode and a storage capacitor on a substrate;
forming a first insulating film over the substrate to expose portions of the source/drain electrode and an electrode of the storage capacitor so as to define first and second contact holes through the first insulating film;
forming a reflective electrode in contact with the source/drain electrode through the first contact hole and in contact with the electrode of the storage capacitor through the second contact hole; and
forming a transparent electrode on the substrate.
2. The method of claim 1 , further comprising the step of:
forming a second insulating film on the substrate to expose another portion of the source/drain electrode through a third contact hole,
wherein the transparent electrode contacts the source/drain electrode through the third contact hole.
3. The method of claim 2 , wherein, in the step of forming the transparent electrode, the transparent electrode does not contact the reflective electrode.
4. The method of claim 1 , wherein, in the step of forming the first insulating film, the first insulating film further includes a third contact hole for exposing a different portion of the source/drain electrode, and the transparent electrode is in contact with the source/drain electrode through the third contact hole.
5. The method of claim 4 , wherein, in the step of forming the transparent electrode, the transparent electrode is in contact with the reflective electrode and covers the reflective electrode.
6. The method of claim 1 , further comprising the steps of:
forming a gate electrode on the substrate;
forming a gate insulating layer covering both the gate electrode and another electrode of the storage capacitor; and
forming a semiconductor film on the gate insulating layer.