Abstract: A display device includes: a first circuit layer; a display element layer on the first circuit layer; an electrochromic element on the display element layer; a second circuit layer electrically connected to the electrochromic element; and a color filter layer on the electrochromic element, wherein the display element layer comprises a first light emitting element and a second light emitting element, wherein the electrochromic element comprises a first electrochromic element overlapping with the first light emitting element and a second electrochromic element overlapping with the second light emitting element, and wherein the first electrochromic element and the second electrochromic element are configured to be driven individually.

Abstract: A display device and an electronic device including the same are provided. The display device includes a substrate; a plurality of light-emitting pixel electrodes on one side of the substrate; a plurality of sensing pixel electrodes on one surface of the substrate and spaced from the plurality of light-emitting pixel electrodes; a pixel defining layer exposing a portion of each of the plurality of light-emitting pixel electrodes and the plurality of sensing pixel electrodes and defining a plurality of light-emitting areas and a plurality of photo-sensing areas; a plurality of light-emitting layers on the plurality of light-emitting pixel electrodes in the plurality of light-emitting areas; a plurality of photo-sensing layers on the plurality of sensing pixel electrodes in the plurality of photo-sensing areas; a common electrode on the pixel defining layer, the plurality of light-emitting layers, and the plurality of photo-sensing layers.

Abstract: An optical filter, a display device including the optical filter, and an electronic device including the same are provided. The display device may include a light source that outputs light, a spatial light modulator that modulates phase or amplitude of light output from the light source, and an optical filter that filters light provided from the spatial light modulator. The optical filter may include a substrate, a first layer on one side of the substrate, a second layer on the first layer, and a third layer on the second layer. The first layer, the second layer, and the third layer may include materials different from one another. A height of the first layer, a height of the second layer, and a height of the third layer may be different from one another.

Abstract: Provided are an optical device, a display device including the optical device, and an electronic device including the display device. According to one or more embodiments of the present disclosure, there is provided an optical device including a substrate, a first metalens layer disposed on a surface of the substrate and including a plurality of first nanostructures, and a second metalens layer disposed on the surface of the substrate, overlapping with the first metalens layer in a thickness direction of the substrate, and including a plurality of second nanostructures. The first metalens layer may include a first refractive portion where the plurality of first nanostructures is disposed to refract incident light, and a first non-refractive portion where the plurality of first nanostructures is not disposed. The plurality of second nanostructures may overlap with the first refractive portion and the first non-refractive portion in the thickness direction of the substrate.

Abstract: A display device includes: a plurality of display areas; and a first transmissive area between the plurality of display areas and configured to transmit light traveling from outside, wherein each of the plurality of display areas includes: a first sub-display area comprising first sub-pixels configured to emit first light; a second sub-display area comprising second sub-pixels configured to emit second light; a third sub-display area comprising third sub-pixels configured to emit third light; and a fourth sub-display area comprising fourth sub-pixels configured to emit fourth light.

Abstract: A holographic display is provided. A holographic display includes, a first substrate, a first lens layer on one surface of the first substrate, a light source layer on an opposite surface of the first substrate, a second substrate on the first lens layer, a light modulation element on one surface of the second substrate, and a second lens layer on an opposite surface of the second substrate, wherein each of the first lens layer and the second lens layer includes a meta-lens.

Abstract: The present invention provides a smart mirror apparatus using an LCD panel. The smart mirror of the present invention includes a reflective mirror, which is provided in the vehicle, and an LCD panel, which is placed in a light path between the reflective mirror and eyes of the driver and has one or two polarizing sheets. The smart mirror further includes an incident light detecting unit, which detects both the brightness of the incident light transmitted from the rear to the LCD panel and the brightness around the LCD panel, and calculates a difference value therebetween. The smart mirror further includes a voltage determination unit, which receives the calculated difference value and determines the drive voltage depending on the difference value, and a voltage apply and supply unit which applies the drive voltage, determined by the voltage determination unit, to the LCD panel.

Abstract: A back bias voltage level detector is capable of accurately detecting a back bias voltage level by constantly maintaining a voltage inputted into a comparator using a clamp circuit or a current mirror circuit. The back bias voltage level detector includes voltage control circuitry for accurately detecting the back bias voltage and maintaining a constant input voltage to the comparator, and first and second resistors coupled in series between an electric voltage and a back bias voltage for distributing voltage inputted thereto. A comparator compares the distributed and inputted voltage with a reference voltage. A back bias voltage detector is provided for outputting a detection signal by determining that a predetermined back bias voltage is detected when the input voltage and the reference voltage are identical as a result of the comparison.