Organic EL display
View Patent ↗An organic EL display is constituted by providing a stress-relieving layer made of a material having a higher elastisity and a lower refractive index than an adhesive layer at edges of color-converting filters that are constituted from color filter layers alone, or color filter layers and color-converting layers, and are formed on a transparent supporting substrate. As a result, stress arising when bonding the color-converting filters and the organic light-emitting device together, or when there are changes in the environment in which the display is placed is absorbed by the stress-relieving layer, and hence the light-emitting device is not damaged, and moreover reflection at walls of the stress-relieving layer is promoted, and hence there is a reduction in the component of the light emitted by the light-emitting device that escapes sideways. An organic EL display having high reliability and high efficiency is thus provided.
1. An organic electroluminescent display, comprising:
(a) an organic light-emitting device including, in the recited sequence,
a substrate,
thin film transistors that each have a source and a drain,
anodes or cathodes that include an electrically conductive thin film material and are each connected to the source or the drain on a corresponding one of the thin film transistors,
an organic electroluminescent light-emitting layer,
an upper transparent electrode that is a cathode or anode and includes a transparent electrically conductive material, and
at least one passivation layer on the upper transparent electrode;
(b) a color-converting substrate that comprises
a transparent supporting substrate, and
color-converting filters that comprise color filter layers alone, or color filter layers and color-converting layers, and are disposed on the supporting substrate, the color-converting filters having edges;
(c) adhesive that is disposed between the organic light-emitting device and the color-converting filters, and that bonds the organic light-emitting device and the color-converting filters together with the color-converting filters facing the upper transparent electrode of the organic light-emitting device; and
(d) a stress-relieving layer that is disposed between the organic light-emitting device and the color-converting filters, the stress-relieving layer being patterned to have walls that are disposed in positions corresponding to the edges of the color-converting filters and to have openings between the walls, the adhesive extending into the openings,
wherein the stress-relieving layer is black.
2. An organic electroluminescent display, comprising:
(a) an organic light-emitting device including, in the recited sequence,
a substrate,
thin film transistors that each have a source and a drain,
anodes or cathodes that include an electrically conductive thin film material and are each connected to the source or the drain on a corresponding one of the thin film transistors,
an organic electroluminescent light-emitting layer,
an upper transparent electrode that is a cathode or anode and includes a transparent electrically conductive material, and
at least one passivation layer on the upper transparent electrode;
(b) a color-converting substrate that comprises
a transparent supporting substrate, and
color-converting filters that comprise color filter layers alone, or color filter layers and color-converting layers, and are disposed on the supporting substrate, the color-converting filters having edges;
(c) adhesive that is disposed between the organic light-emitting device and the color-converting filters, and that bonds the organic light-emitting device and the color-converting filters together with the color-converting filters facing the upper transparent electrode of the organic light-emitting device; and
(d) a stress-relieving layer that is disposed between the organic light-emitting device and the color-converting filters, the stress-relieving layer being patterned to have walls that are disposed in positions corresponding to the edges of the color-converting filters and to have openings between the walls, the adhesive extending into the openings,
wherein the stress-relieving layer has fine particles dispersed therein that promote thermal conductivity.
3. An organic electroluminescent display, comprising:
(a) an organic light-emitting device including, in the recited sequence,
a substrate,
thin film transistors that each have a source and a drain,
anodes or cathodes that include an electrically conductive thin film material and are each connected to the source or the drain on a corresponding one of the thin film transistors.
an organic electroluminescent light-emitting layer,
an upper transparent electrode that is a cathode or anode and includes a transparent electrically conductive material, and
at least one passivation layer on the upper transparent electrode;
(b) a color-converting substrate that comprises a transparent supporting substrate, and
color-converting filters that comprise color filter layers alone, or color filter layers and color-converting layers, and are disposed on the supporting substrate, the color-converting filters haying edges;
(c) adhesive that is disposed between and in direct contact with the organic light-emitting device and the color-converting filters, and that bonds the organic light-emitting device and the color-converting filters together with the color-converting filters facing the upper transparent electrode of the organic light-emitting device; and
(d) a stress-relieving layer that is disposed between the organic light-emitting device and the color-converting filters, the stress-relieving layer being patterned to have walls that are disposed in positions corresponding to the edges of the color-converting filters and to have openings between the walls, the adhesive extending into the openings, the stress-relieving layer being formed from a polymeric material having fine carbon particles dispersed therein to promote thermal conductivity.