Abstract: An optical device including an achromatic phase doublet and a method of driving an optical device having reduced chromatic aberration is provided. The optical device includes an electroactive lens including an electroactive material layer, wherein the electroactive lens is configured to form a doublet phase function by applying a voltage to the electroactive material layer, the doublet phase function including a kinoform phase function and a harmonic lens phase function.

Abstract: An optical device is provided. The optical device includes a display apparatus including the same, and a method of extending an optical path. The optical device includes at least one electroactive optical cell configured to adjust a phase profile of light, and an optical path extender to extend an optical path by allowing light to transmit through the at least one electroactive optical cell in opposite directions a plurality of times.

Abstract: An optical device including an achromatic phase doublet and a method of driving an optical device having reduced chromatic aberration is provided. The optical device includes an electroactive lens including an electroactive material layer, wherein the electroactive lens is configured to form a doublet phase function by applying a voltage to the electroactive material layer, the doublet phase function including a kinoform phase function and a harmonic lens phase function.

Abstract: An optical lens having a tunable focal length and a display device including the same are provided. The optical lens includes a control electrode including a plurality of electrode elements, an electroactive material layer provided on the control electrode, and a common electrode spaced apart from the control electrode. The electroactive material layer is interposed between the common electrode and the control electrode. The optical lens includes a plurality of bus sets, each bus set of the plurality of bus sets including a plurality of buses, wherein the plurality of bus sets include a first bus set and a second bus set, the first bus set is configured to apply a first voltage to the plurality of electrode elements to generate a first phase profile of light, and the second bus set is configured to apply a second voltage to the plurality of electrode elements to generate a second phase profile of light.

Abstract: A mid-air image display device and an operation method thereof are provided. The mid-air image display device includes: a projection system configured to generate a light beam for an image; at least one positive lens; and a light multiplication module comprising a first transmission grating, a second transmission grating, a waveguide and a reflection grating, and configured to receive the light beam from the projection system and transmit the received light beam through the first transmission grating, the second transmission grating, the waveguide and the reflection grating, wherein the at least one positive lens is disposed on the light multiplication module, and configured to receive the light beam transmitted through the light multiplication module to form a mid-air image.

Abstract: A display device is provided. The display device includes at least one virtual object image source, at least one display device for displaying a virtual object image, and at least one variable lens. The at least one variable lens includes at least two variable optical cells.

Abstract: An optical lens having a tunable focal length and a display device including the same are provided. The optical lens includes a control electrode including a plurality of electrode elements, an electroactive material layer provided on the control electrode, and a common electrode spaced apart from the control electrode. The electroactive material layer is interposed between the common electrode and the control electrode. The optical lens includes a plurality of bus sets, each bus set of the plurality of bus sets including a plurality of buses, wherein the plurality of bus sets include a first bus set and a second bus set, the first bus set is configured to apply a first voltage to the plurality of electrode elements to generate a first phase profile of light, and the second bus set is configured to apply a second voltage to the plurality of electrode elements to generate a second phase profile of light.

Abstract: A tunable optical lens having an adjustable focal length includes an electro-active material layer, and a control electrode having a plurality of electrode components, wherein the control electrode includes at least two electrode patterns each of which is configured to generate one or more different diffraction zones, and the at least two electrode patterns are configured to generate different phase profiles from each other with respect to light transmitted through the at least two electrode patterns, when a voltage is applied to the control electrode.