Organic light emitting display device having improved light emitting efficiency
AssigneeSamsung Display Co., Ltd.
InventorSeung-Yong Song
Life of this patent
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Abstract
In an organic light emitting display device according to an embodiment of the present disclosure, a light extraction reduction preventing layer is disposed between a display unit disposed on a substrate and an encapsulation layer for protecting the display unit, and as a result, light emission efficiency may be improved by reducing an amount of light dissipating while light generated from an emission layer of the display unit is extracted to the outside.
Claims18
An organic light emitting display device, comprising:
- a substrate;
- a display unit disposed on the substrate;
- a light extraction reduction preventing layer disposed on the display unit;
- an encapsulation layer disposed on the light extraction reduction preventing layer, and
- a capping layer disposed between the display unit and the light extraction reduction preventing layer,
- the light extraction reduction preventing layer being interposed between a first adjacent layer and a second adjacent layer and having a refractive index that is lower than a refractive index of the first adjacent layer and lower than a refractive index of the second adjacent layer, the first adjacent layer being entirely covered by the second adjacent layer, and
- in a cross-sectional view, the light extraction reduction preventing layer is entirely covered and contacted by the encapsulation layer and the capping layer.
A manufacturing method of an organic light emitting display device, comprising:
- forming a display unit on a substrate;
- forming a light extraction reduction preventing layer on the display unit;
- forming an encapsulation layer on the light extraction reduction preventing layer, the light extraction reduction preventing layer being interposed between a first adjacent layer and a second adjacent layer and having a refractive index that is lower than a refractive index of the first adjacent layer and lower than a refractive index of the second adjacent layer, the first adjacent layer being entirely covered by the second adjacent layer;
- and
- forming a capping layer before the step of forming the light extraction reduction preventing layer and after the step of forming the display unit, the capping layer disposed between the display unit and the light extraction reduction preventing layer,
- in a cross-sectional view, the light extraction reduction preventing layer is entirely covered and contacted by the encapsulation layer and the capping layer.
An organic light emitting display device, comprising:
- a substrate;
- a first electrode disposed on the substrate;
- an emission layer disposed on the first electrode;
- a second electrode formed on the emission layer;
- a capping layer disposed on the second electrode;
- a light extraction reduction preventing layer disposed on the capping layer;
- and
- an encapsulation layer disposed on the light extraction reduction preventing layer,
- a refractive index of the light extraction reduction preventing layer being lower than a refractive index of the capping layer and lower than a refractive index of the encapsulation layer, the capping layer being entirely covered by the encapsulation layer,
- in a cross-sectional view, the light extraction reduction preventing layer is entirely covered and contacted by the encapsulation layer and the capping layer.
Dependencies are inferred from the claim text.