Methods of making combinational structures for electro-luminescent displays

1. A method of manufacturing a picture element for an electro-luminescent display, comprising:

forming a first buffer layer on both a first area and a second area above a substrate;

forming a second buffer layer on both the first area and the second area above the first buffer layer;

forming a gate oxide layer on both the first area and the second area above the second buffer layer;

forming a dielectric layer on both the first area and the second area above the gate oxide layer;

forming a passivation layer on both the first area and the second area above the dielectric layer;

etching the passivation layer on the second area;

etching the dielectric layer on the second area;

etching the gate oxide layer on the second area;

forming at least one first color type electro-luminescent device disposed above the passivation layer on the first area; and

forming at least one second color type electro-luminescent device disposed above the second buffer layer on the second area.

2. The method of claim 1 , wherein the first buffer layer is made of silicon nitride and the second buffer layer is made of silicon oxide.

3. The method of claim 1 , wherein the first color type electro-luminescent device is a blue light organic light emitting diode.

4. The method of claim 3 , wherein the blue light organic light emitting diode comprises:

an anode disposed above the passivation layer;

at least one organic light emitting layer disposed above the anode; and

a cathode disposed above the organic light emitting layer.

5. The method of claim 4 , wherein the anode comprises indium tin oxide.

6. The method of claim 1 , wherein the second color type electro-luminescent device is a green light or red light organic light emitting diode.

7. The method of claim 6 , wherein the green light or red light organic light emitting diode comprises:

an anode disposed above the second buffer layer;

at least one organic light emitting layer disposed above the anode; and

a cathode disposed above the organic light emitting layer.

8. The method of claim 7 , wherein the anode of the green or red light organic light emitting diode comprises indium tin oxide.

9. The method of claim 1 , wherein the substrate is a transparent substrate.

10. A method of manufacturing a picture element for an electro-luminescent display, comprising:

forming first and second buffer layers over first and second areas above a substrate;

forming a gate oxide layer over the first and second areas above the second buffer layer;

forming a dielectric layer over the first and second areas above the gate oxide layer;

forming a passivation layer over the first and second areas above the dielectric layer;

etching the passivation layer, the dielectric layer, and the gate oxide layer over the second area only;

forming a blue color type electro-luminescent device disposed above the passivation layer on the first area; and

forming a red or green color type electro-luminescent device disposed above the second buffer layer on the second area.

11. The method of claim 10 , wherein the blue color type electro-luminescent device comprises a blue light organic light emitting diode comprising:

an anode disposed above the passivation layer;

an organic light emitting layer disposed above the anode; and

a cathode disposed above the organic light emitting layer; and

wherein the red or green color type electro-luminescent device comprises a red or green light organic light emitting diode comprising:

an anode disposed above the second buffer layer;

an organic light emitting layer disposed above the anode; and

a cathode disposed above the organic light emitting layer.