ORGANIC LIGHT EMITTING DEVICE AND DISPLAY DEVICE

Abstract

An object of the present invention is to maintain sufficient light extraction from an organic light emitting device and reduce reflection of external light. There are arranged a polarizing member, a prism member, a phase member, and an organic light emitting element which has an organic light emitting layer arranged between a pair of electrodes, in mentioned order from the side of a light extraction surface. When the prism member includes two sheets, the vertex angle of the prism member sheet arranged on the side of the organic light emitting element is preferably a vertex or less of the prism member arranged on the side of the light extraction surface. Furthermore, the prism members are preferably arranged so that pitch directions thereof are orthogonal to each other.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B are a schematic longitudinal sectional view and a three-dimensional conceptual view of an organic light emitting device according to an embodiment of the present invention, respectively.

FIG. 2 is a longitudinal sectional view illustrating the structure of an organic light emitting element according to an embodiment of the present invention.

FIG. 3 is a radiation angle property diagram of the light intensity of emitted light extracted from an organic light emitting device having a stacked prism member with a vertex angle of 45°.

FIG. 4 is a radiation angle property diagram of organic light emitting devices having stacked prism members with vertex angles of 45° and 90°.

FIG. 5 is a schematic diagram showing a state that internal emitted light is refracted and extracted on a prism surface.

FIG. 6 is a graph showing a relationship between the vertex angle of a prism and the inclination angle (°) of emitted light extracted out of the front.

FIG. 7 is a graph showing a relationship between the vertex angle of a prism and the deviation of a light emitting part in a transverse direction.

FIGS. 8A and 8B are conceptual views in a state that a prism member is viewed from the upper surface.

FIG. 9 is a schematic longitudinal sectional view of the prism member, the polarizing member and the phase member in example of the present invention.

Claims

1. An organic light emitting device comprising: a substrate;an organic light emitting element arranged on the substrate, including a pair of electrodes and an organic compound layer arranged between the pair of electrodes;a phase member arranged on a light extraction side of the organic light emitting element;a prism member arranged on a light extraction side of the phase member; anda polarizing member arranged on a light extraction side of the prism member.

2. The organic light emitting device according to claim 1, wherein the prism member includes two prism members.

3. The organic light emitting device according to claim 2, wherein a vertex angle of the prism member arranged on the side of the organic light emitting element is a vertex angle or less of the prism member arranged on the light extraction side.

4. The organic light emitting device according to claim 2, wherein the vertex angle of the prism member arranged on the side of the organic light emitting element is 30° or more and 80° or less, and the vertex angle of the prism member arranged on the light extraction side is 65° or more and 140° or less.

5. The organic light emitting device according to claim 2, wherein pitch directions of the two prism members are orthogonal to each other.

6. The organic light emitting device according to claim 2, wherein a stretching direction of the polarizing member is orthogonal to a pitch direction of the prism member arranged on the light extraction side.

7. The organic light emitting device according to claim 1, wherein the polarizing member transmits P-polarized light and absorbs S-polarized light.

8. The organic light emitting device according to claim 1, wherein the prism member has an uneven surface subjected to an antireflection-coating process.

9. The organic light emitting device according to claim 1, wherein external light incident to the organic light emitting element and external light reflected by the organic light emitting element are circular polarized light.

10. The organic light emitting device according to claim 1, wherein light emitted from the organic compound layer is extracted from the side of the substrate.

11. A display device comprising: a substrate;a plurality of organic light emitting elements arranged on the substrate, each of the organic light emitting elements including a pair of electrodes and an organic compound layer arranged between the pair of electrodes;a phase member arranged on a light extraction side of the organic light emitting element;a prism member arranged on a light extraction side of the phase member; anda polarizing member arranged on a light extraction side of the prism member.

12. The display device according to claim 11, wherein the display device has a rectangular display area; the prism member includes two prism members; and a longitudinal direction of the display device is orthogonal to a pitch direction of the prism member arranged on the light extraction side.

13. The display device according to claim 11, wherein the light emitting surface of the organic light emitting element has a rectangular shape; the prism member includes two prism members; and a longitudinal direction of the light emitting surface of the organic light emitting element is orthogonal to a pitch direction of the prism member arranged on the light extraction side.