System for displaying images and method for fabricating the same
View Patent ↗An exemplary embodiment of a system comprises an active matrix organic electroluminescent device, having a substrate, and a plurality of scan lines and data lines disposed on the substrate, for defining a plurality of pixel regions. Each pixel structure comprises: a switching thin film transistor, a driving thin film transistor, and a storage capacitor. The switching TFT has a light-shielding layer adapted for preventing the sunlight from being incident into the switching TFT. The driving TFT is a bottom gate thin film transistor and have advantages of precisely controlling the current provided to the organic electroluminescent diode. Further, since the storage capacitor has a multilayer structure and occupies a reduced pixel area, the aperture ratio of the pixel structure can be increased.
1. A method of fabricating a system for displaying images, wherein the system comprising an active matrix organic electroluminescent device, the method comprising:
providing a substrate having a switching thin film transistor region, a driving thin film transistor region, and a storage capacitor region;
forming a first conductive layer within the switching thin film transistor region, a first gate electrode within the driving thin film transistor region, and a lower first electrode within the storage capacitor region;
forming a first dielectric layer on the substrate to cover the first conductive layer, the lower first electrode, and the first gate electrode;
forming a first poly island on the first dielectric layer within the switching thin film transistor region, a second poly island on the first dielectric layer within the driving thin film transistor region, and a third poly island on the first dielectric layer within the storage capacitor region;
performing a doping process to the third poly island to form a second electrode;
forming a second dielectric layer on the substrate to cover the poly islands and the second electrode;
forming a second gate electrode on the second dielectric layer over the first poly island, a higher first electrode on the second dielectric layer over a part of the second electrode, a second conductive layer on the second dielectric layer over the second poly island;
forming first source and drain regions in the first poly island to define a first channel region located between the first source and drain regions, and second source and drain regions in the second poly island to define a second channel region located between the second source and drain regions;
forming a passivation layer on the substrate;
forming a first contact to contact the second drain region; and
forming a pixel electrode to electrically connect to the second drain region via the first contact;
forming a second contact to electrically connect the second electrode and the second source region; and
forming a third contact to electrically connect the first source and drain regions, the lower first electrode, and the high first electrode.
2. The method as claimed in claim 1 , wherein the lower first electrode and the first gate electrode are connected.
3. The method as claimed in claim 1 , wherein the first conductive layer, the first gate electrode and the lower first electrode are of the same material and formed by the same process.
4. The method as claimed in claim 1 , wherein the first poly island, the second poly island, and the third poly island are of the same material and formed by the same process.
5. The method as claimed in claim 1 , wherein the second electrode, the first source and drain regions are formed by the same doping process.
6. The method as claimed in claim 1 , wherein the second gate electrode, the higher first electrode, and the second conductive layer are of the same material and formed by the same process with a scan line.
7. The method as claimed in claim 1 , wherein the first contact, the second contact, and the third contact are of the same material and formed by the same process with a data line.
8. The method as claimed in claim 1 , after forming the first contact, further comprising:
forming an organic electroluminescent diode on the passivation layer, wherein the organic electroluminescent diode comprises the pixel electrode, serving as an anode electrode of the organic electroluminescent diode, electrically connected to the second drain region via the first contact.