CROSS-REFERENCE TO RELATED PATENT APPLICATIONS

This application is a U.S. National Stage Application under 35 U.S.C. § 371 of International Patent Application No. PCT/CN2019/083278, filed Apr. 18, 2019, which claims the priority of the Chinese Patent Application No. 201810389359.0 filed on Apr. 26, 2018, both of which are incorporated by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to a photonic crystal, a display panel, a light conversion device and a pair of glasses.

BACKGROUND

With advancement of electronic technology, digital devices such as computers, liquid crystal display televisions, and smart phone portable game consoles with liquid crystal display panels have entered daily lives of people. When viewing a light conversion device including a liquid crystal display panel for a long time, blue light of light emitted from the liquid crystal display panel may adversely affect the human eyes, especially that short-wave blue light with a wavelength of 420 nm to 470 nm may increase amount of toxins in a macular region of the human eyes, causing macular degeneration in the eyes, which seriously threatens eyes health.

SUMMARY

Embodiments of the present disclosure provide a photonic crystal, a display panel, a light conversion device and a pair of glasses.

At least one embodiment of the present disclosure provides a photonic crystal including first dielectric layers and second dielectric layers having different refractive indexes, and the first dielectric layers and the second dielectric layers are alternately stacked. A thickness and a refractive index of each of the first dielectric layers and a thickness and a refractive index of each of the second dielectric layers are configured such that the photonic crystal blocks blue light with a wavelength of 420 nm to 470 nm incident into the photonic crystal from passing through the photonic crystal.

For example, the refractive index of each of the first dielectric layers is n1, the thickness of each of the first dielectric layers is h1, the refractive index of each of the second dielectric layers is n2, the thickness of each of the second dielectric layers is h2, n1*h1=n2*h2=λ0/4, and λ0is in a range of 440 nm to 455 nm.

For example, a ratio of the refractive index of each of the first dielectric layers to the refractive index of each of the second dielectric layers is 1.2 to 1.4.

For example, the ratio of the refractive index of each of the first dielectric layers to the refractive index of each of the second dielectric layers is in a range of 1.25 to 1.35.

For example, the first dielectric layers and the second dielectric layers are both fabricated by an optical thin film preparation technology.

For example, the refractive index of each of the first dielectric layers is in a range of 1.8 to 2.0, and the refractive index of each of the second dielectric layers is in a range of 1.3 to 1.5.

For example, a material of the first dielectric layers includes silicon nitride, and a material of the second dielectric layers include silicon oxide.

For example, the thickness of each of the first dielectric layers is in a range of 55 nm to 60 nm, and the thickness of each of the second dielectric layers is in a range of 75 nm to 85 nm.

For example, a count of the first dielectric layers is the same as a count of the second dielectric layers.

Another embodiment of the present disclosure provides a light conversion device including a light conversion layer and the photonic crystal described above. The light conversion layer is configured to transmit a portion of first color incident light and to make another portion of the first color incident light pass through the light conversion layer to emit light of at least one other color. A wavelength of the first color incident light is smaller than a wavelength of the light of at least one other color, and the photonic crystal is disposed at a light emit side of the light conversion layer.

For example, the light conversion layer includes a quantum dot material or a fluorescent material.

Another embodiment of the present disclosure provides a display panel including the photonic crystal described above, and the photonic crystal is located at a light emit side of the display panel.

Another embodiment of the present disclosure provides a pair of glasses including lenses and the photonic crystal described above. The photonic crystal is stacked on the lenses.

