Organic EL display device comprising a reflection structure
The present invention provides an organic EL display device which has a long lifetime. The organic EL display device includes a plurality of pixels each of which is constituted of a top-emission-type active matrix organic EL element. The EL element includes: a pixel electrode; a reflective layer arranged between the pixel electrode and an active element and is formed over a leveling layer; an organic light emission layer; and a common electrode. The reflective layer includes: a first reflective layer which is made of high-melting-point metal; and a second reflective layer which is arranged on the first reflective layer. The second reflective layer includes a planar pattern in which an outer periphery of the second reflective layer is surrounded by the first reflective layer. The pixel electrode extends outward from the first reflective layer and the second reflective layer.
1. An organic EL display device including a plurality of pixels, each pixel being constituted of a top-emission-type active matrix organic EL element, wherein
the top-emission-type active matrix organic EL element comprises:
a pixel electrode which is connected to an active element;
a reflective layer arranged between the pixel electrode and an active element and is formed over a leveling layer;
an organic light emission layer which is arranged on the pixel electrode; and
a common electrode which is arranged on the organic light emission layer,
the reflective layer comprises:
a first reflective layer which is made of high-melting-point metal; and
a second reflective layer which is arranged on the first reflective layer and is made of alloy containing aluminum, an aluminum compound or aluminum silicide,
wherein the second reflective layer includes a planar pattern in which an outer periphery of the second reflective layer is surrounded by the first reflective layer, and
wherein the pixel electrode extends outward from the first reflective layer and the second reflective layer.
2. An organic EL display device according to claim 1 , wherein edges of the second reflective layer are forwardly tapered.
3. An organic EL display device according to claim 1 , wherein the first reflective layer is made of Mo alloy or W alloy.
4. An organic EL display device according to claim 1 , wherein the first reflective layer and the second reflective layer are covered with the pixel electrode made of ITO.
5. An organic EL display device according to claim 1 , wherein edges of the first reflective layers, the second reflective layers and the pixel electrodes are covered with a pixel separation layer.