Organic EL display provided with gel-state encapsulant incorporating a desiccant and a high molecular-weight medium
View Patent ↗A sealing substrate is arranged to oppositely face an element substrate on which organic EL layers are formed in a matrix array with a sealing material sandwiched therebetween. A gel-state desiccant is filled in an inner space surrounded by the element substrate, the sealing substrate and the sealing material. Since the gel-state desiccant is in a gel state, the gel-state desiccant is flexibly filled in the inner space of the organic EL display device thus completely eliminating a gap. Since the inner space is filled with the gel-state desiccant, moisture hardly intrudes into the inner space from the outside and, at the same time, a mechanical strength of the organic EL display device is also enhanced.
1. An organic EL display device comprising:
a first substrate having a display region where pixels are arranged in a matrix array and a peripheral region surrounding the display region;
a second substrate which faces the first substrate in an opposed manner;
a resin sandwiched between the first substrate and the second substrate,
wherein each pixel has a pixel electrode controlled by a data signal and an organic EL layer formed on the pixel electrode;
an upper electrode formed on the organic EL layer in the whole display region;
a protective film formed of inorganic material and covering the upper electrode, wherein the protective film over the peripheral region is thinner than the protective film over the display region; and
a sealing material formed in an annular shape between the peripheral region of the first substrate and the second substrate.
2. The organic EL display device according to claim 1 , wherein the sealing material is made of an ultraviolet-ray curing resin.
3. The organic EL display device according to claim 1 , wherein the protective film is formed of at least one of silicon nitride and silicon oxide.
4. The organic EL display device according to claim 1 , wherein the resin is sandwiched between the second substrate and the protective film covering the peripheral region and the display region.