The present application claims the benefits of Chinese patent application No. 201710937180.X, which was filed on Oct. 10, 2017 and is fully incorporated herein by reference as part of the present application.

TECHNICAL FIELD

Embodiments of the present disclosure relate to a display panel, a display device, and a manufacturing method of the display panel.

BACKGROUND

Organic light emitting diode (OLED) displays have become the hotspot of research because of advantages such as self-luminescence, high contrast, low thickness, wide viewing angle, fast response speed, flexibility and wide usage temperature range. The OLED displays are considered as the next-generation display technology after liquid crystal display (LCD).

An OLED generally includes an anode, a cathode and an organic electroluminescent unit disposed between the two electrodes. The organic electroluminescent unit at least includes a hole transport layer (HTL), a light emitting layer and an electron transport layer (ETL). Semiconductor microcavity is an optical structure for spectrum narrowing, and photons generated in the light emitting layer are confined in a cavity formed by two mirror surfaces; an organic layer of the OLED is also sandwiched between the two electrodes; and an optical thickness of the organic layer is almost on the same magnitude as the light wavelength. Therefore, the luminous characteristics of the OLED not only depend on the inherent characteristics of the OLED material itself, but also can utilize the anode and the cathode to form a, thereby generating a microcavity effect on the luminous characteristics, such that the light emitted by the light emitting layer forms strong interference of multiple beams in the cavity, thereby narrowing the emission spectrum and modulating the peak wavelength of the emission spectrum.

SUMMARY

At least an embodiment of the present disclosure provides a display panel, including: a light emitting element, including a microcavity structure and a light emitting layer disposed in the microcavity structure; and an external microcavity structure, disposed on a light emitting side of the light emitting element and including a first transflective layer, a second transflective layer and a dielectric layer disposed between the first transflective layer and the second transflective layer, wherein the microcavity structure is configured to modulate a spectrum of light emitted by the light emitting layer in a first viewing angle range; the external microcavity structure is configured to modulate a spectrum of light emitted by the light emitting element in a second viewing angle range; and the second viewing angle range is larger than the first viewing angle range.

For example, in the display panel provided by an embodiment of the present disclosure, a cavity length of the microcavity structure of the light emitting element is different from a cavity length of the external microcavity structure.

For example, in the display panel provided by an embodiment of the present disclosure, the microcavity structure of the light emitting element is configured to narrow the spectrum of the light emitted by the light emitting layer in the first viewing angle range; and the external microcavity structure is configured to narrow the spectrum of the light emitted by the light emitting element in the second viewing angle range.

For example, in the display panel provided by an embodiment of the present disclosure, a distance between the external microcavity structure and the microcavity structure is greater than 1000 nm.

For example, in the display panel provided by an embodiment of the present disclosure, the light emitting element further includes a first electrode and a second electrode; the first electrode and the second electrode are disposed on both sides of the light emitting layer and configured to drive the light emitting layer to emit light; and at least one of the first electrode or the second electrode is a reflective electrode so as to form the microcavity structure.

For example, the display panel provided by an embodiment of the present disclosure further including: a first antireflection film, disposed between the external microcavity structure and the light emitting element.

For example, in the display panel provided by an embodiment of the present disclosure, the first antireflection film includes: a first line polarizer and a first quarter-wave plate which are stacked, wherein the first line polarizer is disposed on a side of the first antireflection film close to the light emitting element.

For example, the display panel provided by an embodiment of the present disclosure further including: a second antireflection film, disposed on a side of the external microcavity structure away from the light emitting element.

For example, in the display panel provided by an embodiment of the present disclosure, the second antireflection film further includes: a second line polarizer and a second quarter-wave plate which are stacked, wherein the second line polarizer is disposed on a side of the second antireflection film away from the light emitting element; and a polarization direction of the first line polarizer is the same with a polarization direction of the second line polarizer.

For example, in the display panel provided by an embodiment of the present disclosure, the light emitting layer includes an organic light emitting layer or an inorganic light emitting layer.

For example, in the display panel provided by an embodiment of the present disclosure, the light emitting element includes a plurality of light emitting elements, the plurality of light emitting elements being configured to respectively emit light of different colors; and the external microcavity structure includes a plurality of sub external microcavity structures in one-to-one correspondence with the plurality of light emitting elements of different colors so as to respectively modulate spectrums of light emitted by the plurality of light emitting elements of different colors.

For example, in the display panel provided by an embodiment of the present disclosure, the light emitting element includes: a first color light emitting element, a light emitting layer of the first color light emitting element being configured to emit light of a first color; a second color light emitting elements, a light emitting layer of the second color light emitting element being configured to emit light of a second color; and a third color light emitting element, a light emitting layer of the third color light emitting element being configured to emit light of a third color, the external microcavity structure comprises a first external microcavity structure corresponding to the first color light emitting element, a second external microcavity structures corresponding to the second color light emitting element, and a third external microcavity structure corresponding to the third color light emitting element.

For example, in the display panel provided by an embodiment of the present disclosure, a material of at least one of the first transflective layer or the second transflective layer includes aluminum.

For example, in the display panel provided by an embodiment of the present disclosure, a thickness of the first transflective layer is 3-7 nm, and a thickness of the second transflective layer is 3-7 nm.

For example, in the display panel provided by an embodiment of the present disclosure, a thickness range of the dielectric layer is 300-800 nm.

At least an embodiment of the present disclosure provides a display device, including any one of abovementioned display panels.

At least an embodiment of the present disclosure provides a manufacturing method of a display panel, wherein the display panel is any one of abovementioned display panels; and the manufacturing method includes: measuring a color shift condition of the light emitting element in the second viewing angle range; and setting a distance between the first transflective layer and the second transflective layer according to the color shift condition.

