A display module to prevent the leakage current generated between a first electrode layer and a second electrode layer that constitute a pixel via an organic light emitting layer and obtains uniform luminance. An interlayer insulation layer is provided between an edge of a first electrode layer and an organic light emitting layer that constitute the pixel and the distance between the edge and a second electrode layer is secured sufficiently. Further, the interlayer insulation layer ILI is coated with a resin material having fluidity, and flatness is improved as a whole. An aperture that accommodates the organic light emitting layer is formed in this interlayer insulation layer and the coated organic light emitting layer is formed in uniform thickness and through a necessary and sufficient spread.
1. An organic display module including a current supply line;
a thin film transistor connected to the current supply line;
a first electrode connected to the thin film transistor;
an interlayer insulation layer provided on the first electrode, and having an aperture to expose at least a portion of the first electrode;
an organic light emitting layer provided on the first electrode through the aperture;
a second electrode covering the organic light emitting layer; and
a passivation film covering the second electrode,
wherein a surface of the passivation film has a higher degree of flatness than the second electrode,
wherein the interlayer insulation layer includes a portion forming an inner wall of the aperture, said portion of the interlayer insulation layer having a taper to decrease in thickness in a direction from a top portion of the aperture toward a bottom portion of the aperture, the inner wall of the aperture being located between the organic light emitting layer and the first electrode layer;
wherein, to form the surface with the higher degree of flatness of the passivation film compared with the degree of flatness of the second electrode, a thickness of the passivation film which is formed over the organic light emitting layer in the aperture is formed to be thicker than a thickness of the passivation film which is formed over the interlayer insulation layer.
2. An organic display module according to claim 1 ,
wherein the first electrode comprises an anode electrode, and the second electrode comprises a cathode electrode.
3. An organic display module according to claim 1 ,
wherein the first electrode comprises a transparent conductive layer and the passivation film is transparent.
4. An organic display module according to claim 1 ,
wherein an insulation layer is provided under the first electrode, and
the first electrode is connected to the thin film transistor through a contact hole in the insulation layer.
5. An organic display module according to claim 1 ,
wherein the first electrode is comprised of a metal thin film, and the second electrode is comprised of a transparent conductive film.