Organic el display
View Patent ↗In the case of a top emission structure color organic EL display in which are bonded together a substrate having thin film transistors formed thereon and a transparent substrate having color-converting filters formed thereon, an overcoat layer for adjusting the gap between the substrates and an overcoat layer for relieving stress are formed between the substrates without providing a space between the overcoat layers and the EL device, whereby there can be provided an organic EL display having high reliability, with the occurrence of voids that would have an adverse effect on the display performance being prevented, and the occurrence of thermal and mechanical stress being suppressed.
1. An organic electroluminescent display, comprising:
a base substrate;
thin film transistors, disposed on the base substrate, each including a source and a drain;
an organic electroluminescent device, built up on the thin film transistors and driven by the thin film transistors, the organic electroluminescent device further including first electrodes that comprise an electrically conductive thin film material and that are each connected to the source or the drain, at least an organic electroluminescent light-emitting layer, and an upper second electrode that is a transparent electrode comprising a transparent electrically conductive thin film material;
at least one passivation layer;
at least two overcoat layers, the at least two overcoat layers having Young's moduli different from one another;
a color layer, further comprising color-converting layers alone or laminates of color filter layers and color-converting layers; and
a supporting transparent substrate, the color layer being formed on a side of the supporting transparent substrate facing the organic electroluminescent device;
wherein the at least two overcoat layers are laminated onto a second-electrode side of the organic electroluminescent device, and one of the at least two overcoat layers is in close contact with the surface of the passivation layer; and
wherein the substrate and the supporting substrate are sealed and bonded together at a periphery thereof.
2. The organic electroluminescent display according to claim 1 , wherein, out of the at least two overcoat layers having Young's moduli different from one another, the overcoat layer having the lowest Young's modulus is in close contact with the surface of the passivation layer within a display area of the organic electroluminescent device.
3. The organic electroluminescent display according to claim 1 , wherein the elements of the display are arranged in the order of recitation.