Organic electro-luminescent display device including moisture detection member
An organic electro-luminescent display device according to an embodiment of the present invention includes a thin film transistor substrate including a base member; an organic material layer disposed on the base member in a display area and held between a lower electrode and an upper electrode; a dam formed on the base member in an external area surrounding the display area; and a sealing layer formed on the organic material layer, the sealing layer covering the display area, the sealing layer including a sealing planarization film formed of organic material and formed in an area surrounded by the dam, the sealing layer further including a sealing film formed of inorganic material and covering the dam. The dam includes moisture detection member.
1. An organic electro-luminescent (EL) display device comprising, in the following order:
a base member including a display area including a plurality of pixels and an external area surrounding the display area;
a circuit layer including a TFT;
a planarization film;
a lower electrode;
an organic material layer;
an upper electrode; and
a sealing layer including a first sealing film formed of inorganic material, a sealing planarization film formed of organic material, and a second sealing film formed of inorganic material in this order, the sealing layer covering the display area,
wherein
the organic material layer is held between the lower electrode and the upper electrode in the display area,
in the external area, a dam formed of organic material is formed at a position spaced apart from the planarization film,
the sealing planarization film contacts with the first sealing film and the second sealing film, and is positioned on a display area side relative to the dam,
a part of the first sealing film is positioned in the external area, a part of the second sealing film is positioned in the external area, and the first sealing film and the second sealing film cover the dam,
the dam, the first sealing film, and the second sealing film are arranged in this order from a base member side, and the first sealing film and the second sealing film contact each other at a surface of the dam located on a side of the dam opposite from the display area side,
the dam includes a moisture detection member,
a passivation film disposed between the planarization film and the lower electrode, wherein a part of the passivation film is positioned in the external area, and the passivation film covers the dam.
2. An organic electro-luminescent (EL) display device comprising, in the following order:
a base member including a display area including a plurality of pixels and an external area surrounding the display area;
a circuit layer including a TFT;
a planarization film;
a passivation film;
a lower electrode;
an organic material layer;
an upper electrode; and
a sealing layer including a first sealing film formed of inorganic material, a sealing planarization film formed of organic material, and a second sealing film formed of inorganic material in this order, the sealing layer covering the display area,
wherein
the organic material layer is held between the lower electrode and the upper electrode in the display area,
in the external area, a dam formed of organic material is formed at a position spaced apart from the planarization film,
a part of the passivation film is positioned in the external area, and the planarization film and the dam are divided by the passivation film,
the sealing planarization film contacts with the first sealing film and the second sealing film, and is positioned on a display area side relative to the dam,
a part of the first sealing film is positioned in the external area, a part of the second sealing film is positioned in the external area, and the passivation film, the first sealing film, and the second sealing film cover the dam,
the dam, the first sealing film, and the second sealing film are arranged in this order from a base member side, and the first sealing film and the second sealing film contact each other at a surface of the dam located on a side of the dam opposite from the display area side,
the dam includes moisture detection member.
3. The organic EL display device according to claim 2 , wherein the moisture detection member changes color thereof in a presence of moisture.
4. The organic EL display device according to claim 2 , wherein the moisture detection member includes a pH indicator and water-soluble material.
5. The organic EL display device according to claim 4 , wherein the pH indicator is phenolphthalein and the water-soluble material is a basic substance.
6. The organic EL display device according to claim 5 , wherein the basic substance contains sodium carbonate.
7. The organic EL display device according to claim 2 , wherein the dam blocks the sealing planarization film from spreading.