A first transistor, a second transistor, a third transistor, a fourth transistor are provided. In the first transistor, a first terminal is electrically connected to a first wiring; a second terminal is electrically connected to a gate terminal of the second transistor; a gate terminal is electrically connected to a fifth wiring. In the second transistor, a first terminal is electrically connected to a third wiring; a second terminal is electrically connected to a sixth wiring. In the third transistor, a first terminal is electrically connected to a second wiring; a second terminal is electrically connected to the gate terminal of the second transistor; a gate terminal is electrically connected to a fourth wiring. In the fourth transistor, a first terminal is electrically connected to the second wiring; a second terminal is electrically connected to the sixth wiring; a gate terminal is connected to the fourth wiring.

A display device includes a pixel matrix configured to emit light, a first display screen which faces in a first direction, a second display screen which faces in a second direction, and a controller. The controller is configured to control the pixel matrix to emit light which passes through the first display screen and passes into surroundings of the display device in the first direction so that graphical content is displayed on the first display screen, based on image data that define the graphical content. The controller is also configured to operate in a first display mode in which graphical content as defined by image data is only displayed on the first display screen and the second display screen is deactivated, and a second display mode in which identical graphical content is displayed on both the first display screen and the second display screen.

A transparent display panel includes a plurality of unit pixels. Each of the unit pixels includes a non-transparent region in which a first light-emitting element that generates and outputs first color light and a second light-emitting element that generates and outputs second color light are disposed and a transparent region in which a third light-emitting element that generates and outputs third color light is disposed.

A display unit includes a substrate including a pixel region including a plurality of pixels and a peripheral region. The display unit includes a plurality of first electrodes, wherein each of the plurality of first electrodes is in a corresponding pixel of the plurality of pixels. The display unit includes a second electrode opposed to the first electrode, wherein the second electrode is common for all of the plurality of pixels. The display unit includes an organic layer between the second electrode and the plurality of first electrodes, wherein the organic layer includes a light-emitting layer. The display unit includes a wiring layer between the substrate and the plurality of first electrodes. The display unit includes an auxiliary electrically-conductive layer including an organic electrically-conductive material, wherein the auxiliary electrically-conductive layer is electrically coupled to the second electrode. The auxiliary electrically-conductive layer is in a recess in the wiring layer.

A double-sided display panel and a method for manufacturing the same are provided. The double-sided display panel includes: a first substrate; a second substrate opposite to first substrate; a first display unit between the first substrate and the second substrate, the first display unit including a first luminescent layer and a first reflective layer which is closer to the second substrate than the first luminescent layer, wherein at least a part of light emitted from the first luminescent layer is reflected by the first reflective layer and emitted out through the first substrate; and a second display unit between the first substrate and second substrate, including a second luminescent layer, wherein light emitted from the second luminescent layer is emitted out through the second substrate. The first display unit includes a transparent electrode and a conductive contact layer which electrically connects the transparent electrode with the first reflective layer.

The present embodiment provide a method for evaluating anion permeability of a graphene-containing membrane and also to provide a photoelectric conversion device employing a graphene-containing membrane having controlled anion permeability. The method comprises:

preparing a measuring apparatus comprising an aqueous solution containing anions, a working electrode containing silver-metal, a counter electrode and a reference electrode;
measuring the reaction current I.sub.0 between the silver-metal and the anions while the electrode potential of the working electrode to the counter electrode is being periodically changed and driven under the condition that the electrodes are in contact with the aqueous solution;
measuring the reaction current I.sub.1 under the condition that, instead of the working electrode, the graphene-containing membrane electrically connecting to the working electrode is in contact with the aqueous solution; and
comparing the currents I.sub.0 and I.sub.1 to evaluate anion-permeability of the graphene-containing membrane.

A display device includes a cover window that includes a first plane portion and first side portions that form curved sides, and a display panel that includes a first plane area corresponding to the first plane portion and first curved areas corresponding to the first side portions, where the display panel further includes a substrate, a plurality of first type pixels that are disposed in the first plane area and each including a first light emitting diode that is parallel with one side of the substrate, and a plurality of second type pixels that are disposed in the first curved areas, and each including a second light emitting diode that includes at least one non-flat portion forming a non-flat side that is not parallel with one side of the substrate.

The present application discloses a perovskite light-emitting device, a preparation method thereof, and a display. The perovskite light-emitting device includes a first injection layer, a first transport layer, a light-emitting layer, a second transport layer, and a second injection layer, which are sequentially stacked, wherein the first injection layer includes indium tin oxide, the second injection layer includes carbon nanotubes, the light-emitting layer includes halide perovskite, and light emitted by the light-emitting layer is simultaneously emitted from the first injection layer and the second injection layer. The perovskite light-emitting device of the present application can stably emit light on double sides.

A transparent display device for providing only a viewer located at the front with an image is disclosed. The transparent display device comprises a substrate provided with a first subpixel, a second subpixel and a third subpixel, a first electrode provided in each of the first subpixel, the second subpixel and the third subpixel on the substrate, a light emitting layer provided on the first electrode, a second electrode provided on the light emitting layer, an upper color filter provided over the second electrode, a lower color conversion layer provided between the substrate and the first electrode, and a lower color filter provided between the substrate and the lower color conversion layer.

A light emitting device and an element substrate which are capable of suppressing variations in luminance intensity of a light emitting element among pixels due to characteristic variations of a driving transistor without suppressing off-current of a switching transistor low and increasing storage capacity of a capacitor. A gate potential of a driving transistor is connected to a first scan line or a second scan line, and the driving transistor operates in a saturation region. A current controlling transistor which operates in a linear region is connected in series to the driving transistor. A video signal which transmits a light emission or non-emission of a pixel is input to the gate of the current controlling transistor through a switching transistor.