US-12622159-B2 - Display device and electronic apparatus

US12622159B2US 12622159 B2US12622159 B2US 12622159B2US-12622159-B2

Abstract

A display device includes: an organic layer including a light-emitting layer, the light-emitting layer including an organic light-emitting material; a reflective layer configured to reflect light generated at the light-emitting layer; a first electrode that is transparent; a second electrode that is transparent; and an optical adjustment layer configured to adjust an optical distance between the reflective layer and the second electrode. The reflective layer, the optical adjustment layer, the first electrode, the organic layer, and the second electrode are arranged in order. A reflectance of a first interface between the organic layer and the first electrode and a reflectance of a second interface between the organic layer and the second electrode are each 11% or less.

Inventors

Yuiga HAMADE

Assignees

SEIKO EPSON CORPORATION

Dates

Publication Date: 20260505
Application Date: 20230830
Priority Date: 20220831

Claims (8)

1 . A display device comprising: an organic layer including a light-emitting layer, the light-emitting layer including an organic light-emitting material; a reflective layer configured to reflect light generated at the light-emitting layer; a first electrode being transparent; a second electrode being transparent; and an optical adjustment layer configured to adjust an optical distance between the reflective layer and the second electrode, wherein the reflective layer, the optical adjustment layer, the first electrode, the organic layer, and the second electrode are arranged in order and a reflectance of a first interface between the organic layer and the first electrode and a reflectance of a second interface between the organic layer and the second electrode are each 11% or less.
2 . The display device according to claim 1 , wherein the light generated at the light-emitting layer does not resonate between the reflective layer and the second electrode.
3 . The display device according to claim 1 , wherein the light emitted by the light-emitting layer constructively interferes with the light reflected by the reflective layer.
4 . The display device according to claim 1 , wherein a material of the first electrode and a material of the second electrode are different from each other.
5 . The display device according to claim 1 , wherein a pixel of the display device includes a plurality of sub-pixels, the first electrode is provided for each of the plurality of sub-pixels, and the plurality of sub-pixels each has a pixel size of 5 μm 2 or smaller.
6 . The display device according to claim 1 , wherein the light-emitting layer includes: a first light-emitting portion configured to emit light in a first wavelength range, a second light-emitting portion configured to emit light in a second wavelength range shorter than the first wavelength range, and a third light-emitting portion configured to emit light in a third wavelength range shorter than the second wavelength range, the optical adjustment layer includes: a first optical adjustment portion through which the light in the first wavelength range is transmitted, a second optical adjustment portion through which the light in the second wavelength range is transmitted, and a third optical adjustment portion through which the light in the third wavelength range is transmitted, and a thickness of the first optical adjustment portion, a thickness of the second optical adjustment portion, and a thickness of the third optical adjustment portion are different from each other.
7 . The display device according to claim 6 , wherein the thickness of the first optical adjustment portion, the thickness of the second optical adjustment portion, and the thickness of the third optical adjustment portion are in descending order of thickness.
8 . An electronic apparatus comprising: the display device according to claim 1 ; and a control unit configured to control an operation of the display device.

Description

The present application is based on, and claims priority from JP Application Serial Number 2022-137921, filed Aug. 31, 2022, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a display device and an electronic apparatus. 2. Related Art Devices including light-emitting elements such as organic electroluminescence (EL) elements are known. JP-A-2013-8515 discloses an organic EL element used in an organic EL light-emitting device. The organic EL element includes a substrate, a reflective layer, an optical path length adjustment layer, a first electrode, an organic EL layer, and a second electrode. The substrate, the reflective layer, the optical path length adjustment layer, the first electrode, the organic EL layer, and the second electrode are layered in order from the substrate. Also, in the organic EL element described in JP-A-2013-8515, the optical path length adjustment layer, the first electrode, and the organic EL layer constitute a resonator structure. In addition, the optical path length adjustment layer is provided between the reflective layer and the first electrode to increase an optical path length of the resonator structure. However, in the device having the resonator structure as described in JP-A-2013-8515, the colors or luminance of display looks different depending on a viewing direction with respect to the device. That is, in the device described in JP-A-2013-8515, there is a problem of reduction in color viewing angle and luminance viewing angle. SUMMARY In order to solve the above problems, a display device according to a preferred aspect of the present disclosure includes an organic layer including a light-emitting layer, the light-emitting layer including an organic light-emitting material, a reflective layer configured to reflect light generated at the light-emitting layer, a first electrode being transparent, a second electrode being transparent, and an optical adjustment layer configured to adjust an optical distance between the reflective layer and the second electrode, wherein the reflective layer, the optical adjustment layer, the first electrode, the organic layer, and the second electrode are arranged in order, and a reflectance of a first interface between the organic layer and the first electrode and a reflectance of a second interface between the organic layer and the second electrode are each 11% or less. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view schematically illustrating a display device according to a first embodiment. FIG. 2 is an equivalent circuit diagram of a sub-pixel illustrated in FIG. 1. FIG. 3 is a plan view illustrating a part of the display device in FIG. 1. FIG. 4 is a diagram schematically illustrating a partial cross-section of the display device in FIG. 1. FIG. 5 is a diagram for explaining a path of light in the display device in FIG. 4. FIG. 6 is a diagram illustrating a display device of a modified example. FIG. 7 is a diagram schematically illustrating a configuration of a display device of Comparative Example 1. FIG. 8 is a diagram schematically illustrating a configuration of a display device of Comparative Example 2. FIG. 9 is a diagram schematically illustrating a configuration of a display device of Comparative Example 3. FIG. 10 is a diagram schematically illustrating a part of a virtual image display device as an example of an electronic apparatus. FIG. 11 is a perspective view illustrating a personal computer as an example of an electronic apparatus. DESCRIPTION OF EMBODIMENTS Preferred embodiments of the present disclosure will be described below with reference to the accompanying drawings. Note that in the drawings, dimensions and scales of sections differ from actual dimensions and scales as appropriate, and some of the sections are schematically illustrated to make them easily recognizable. Further, the scope of the present disclosure is not limited to these embodiments unless it is otherwise described that the present disclosure in the following description is particularly limited. 1. Display Device 100 1-1. Overall Configuration of Display Device 100 FIG. 1 is a plan view schematically illustrating a display device 100 according to a first embodiment. Note that for convenience of explanation, the description will be made below using an X axis, a Y axis, and a Z axis, which are orthogonal to each other, as appropriate. In addition, one direction along the X axis is defined as an X1 direction, and a direction opposite to the X1 direction is defined as an X2 direction. Similarly, one direction along the Y axis is defined as a Y1 direction, and a direction opposite to the Y1 direction is defined as a Y2 direction. One direction along the Z axis is defined as a Z1 direction, and a direction opposite to the Z1 direction is defined as a Z2 direction. Viewing in the Z1 direction or the Z2 direction is referred to as a “plan view”. The dis