CROSS-REFERENCES TO RELATED APPLICATION

The present application claims the benefit of Korean application no. 10-2019-0118343, filed on Sep. 25, 2019, which is herein incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

1. Field

The present invention relates to a light emission device and an electronic device, and more particularly, to a light emission device including a magnetoactive element, a method of manufacturing the same and an electronic device having the same.

2. Description of the Related Art

The human-interactive display HID, which may visualize invisible information such as touch, smell and sound, is getting keen attention largely due to its potential in the field of wearable electronic devices combined with Internet of Things (IoT) technology. In particular, as the demand for electronic skin that may artificially mimic the characteristics of human skin sensing pressure, temperature and humidity increases, most HIDs focus on the visualization of these functions, and HID technologies are being developed that may visualize the pressure, temperature or humidity.

The development of a new e-skin capable of sensing a magnetic field, i.e., a magneto-interactive electronic skin is of particular interest because it may mimic the magneto-reception function that some animals and insects have for setting and exploring the direction of travel. In addition, the magneto-interactive electronic skin may potentially be suitable for 3D touchless systems because the magneto-interactive electronic skin may sense objects sensitive to the magnetic field without physical contact on the object.

The technique for visualizing the magnetic field beyond the detection of the magnetic field has the technological potential such as the so-called superhuman interactive display. However, the magnetic-interactive display may be implemented by connecting a display and a magnetic sensor through a conventional microprocessor signal conversion, which requires a high complexity, high cost and interconnection steps. Accordingly, the these products may have problems of difficult miniaturization, high cost and difficulties in fabrication thereof.

The technological object to be achieved by the present invention is to provide a light emission device and a method of manufacturing the light emission device that may be easily manufactured in a small size without a complex and bulky connection structure through a microprocessor as a device capable of sensing and visualizing a magnetic field.

In addition, a technological object to be achieved by the present invention is to provide a light emission device having a non-volatile memory characteristic for a magnetic field, and a method of manufacturing thereof as a device capable of sensing and visualizing the magnetic field.

In addition, a technological object to be achieved by the present invention is to provide an electronic device and/or electronic equipment to which the above-described light emission device is applied. The object to be achieved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be understood by those skilled in the art from the following description.

SUMMARY OF THE INVENTION

According to an embodiment of the present invention, a light emission device comprising a light emission layer; a first electrode and a second electrode spaced apart from each other on a first surface side of the light emission layer; and a magnetoactive fluid layer disposed on the second surface side of the light emission layer and having a plurality of nanostructures of which arrangement and distribution is configured to change according to application of a magnetic field, and which is configured to change the light emitting properties of the light emission layer according to the arrangement and distribution of nanostructures in the magnetoactive fluid layer is provided.

The plurality of nanostructures may include a conductive nanowire; and magnetic nanoparticle provided on the surface of the conductive nanowire.

The conductive nanowire may include, for example, carbon nanotube.

The magnetic nanoparticle may include, for example, Fe3O4.

The magnetoactive fluid layer may include an organic solvent and the plurality of nanostructures dispersed in the organic solvent.

After the arrangement and distribution of the plurality of nanostructures are set to the first state by application of the first magnetic field, the first state may be substantially maintained even when the first magnetic field is removed.

The plurality of nanostructures may be configured to form a conductive bridge adjacent to the light emission layer in response to application of a first magnetic field.

The plurality of nanostructures may be configured to eliminate the conductive bridge in response to application of a second magnetic field having a direction opposite to the first magnetic field.

The light emission layer may include an organic material layer and a light emitting element provided in the organic material layer.

The light emission layer may further include a reception element that provides an accommodation space in which the magnetoactive fluid layer is accommodated on the second surface side of the light emission layer.

The light emission device may be an electroluminescence (EL) device driven by an alternating current AC signal.

The light emission device may be a flexible device.

The light emission device may be a wearable device.

According to another embodiment of the present invention, an electronic device including the above-described light emission device is provided.

The electronic device may correspond to at least one of a device sensing a magnetic field, a device visualizing a magnetic field, a device memorizing magnetic field information, and a display device using a magnetic field. For example, the electronic device may include a surgical display device for tracking motion of a magnetic surgical probe.

According to another embodiment of the present invention, a method for manufacturing a light emission device comprising a step for forming a first electrode and a second electrode spaced apart from each other on a substrate; a step for forming a light emission layer on the first and second electrodes; and step for forming a magnetoactive fluid layer including a plurality of nanostructures on the light emission layer, such that arrangement and distribution of the plurality of nanostructures may be changed by application of a magnetic field is provided.

The plurality of nanostructures may include conductive nanowire and magnetic nanoparticle provided on the surfaces of the conductive nanowire.

The method may further include a step for forming a reception element that provides an accommodation space in which the magnetoactive fluid layer is accommodated.

According to embodiments of the present invention, as a device capable of sensing and visualizing a magnetic field, it is possible to implement a light emission device that may be easily manufactured in a small size without a complicated and bulky connection structure through a microprocessor. Further, according to embodiments of the present invention, as a device capable of sensing and visualizing a magnetic field, a light emission device having a non-volatile memory characteristic for a magnetic field may be implemented. The light emission device may be easily manufactured as a flexible device and a wearable device.

According to embodiments of the present invention, an electronic device/electronic equipment to which the above-described light emission device is applied may be implemented.

According to embodiments of the present invention, as a device capable of sensing and visualizing a magnetic field, it is possible to implement a light emission device that may be easily manufactured in a small size without a complicated and bulky connection structure through a microprocessor. Further, according to embodiments of the present invention, as a device capable of sensing and visualizing a magnetic field, a light emission device having a non-volatile memory characteristic for a magnetic field may be implemented. The light emission device may be easily manufactured as a flexible device and a wearable device.

According to embodiments of the present invention, an electronic device/electronic equipment to which the above-described light emission device is applied may be implemented.

