A light-emitting device includes a first light emitter and a second light emitter. A first drive current through the first light emitter and a second drive current through the second light emitter flow in opposite directions. A period in which the first drive current flows and a period in which the second drive current flows at least partially overlap each other. This structure causes the phase of an electromagnetic wave induced by the first drive current to be opposite to the phase of an electromagnetic wave induced by the second drive current, thus allowing the electromagnetic waves to at least partially cancel each other and reducing electromagnetic interference.

A display panel includes: a substrate; light-emitting elements located on a side of the substrate; a first light-blocking layer located on a side of the first light-emitting unit away from the substrate and comprising a first opening; a second light-blocking layer located on a side of the first light-blocking layer away from the substrate and comprising a second opening. One of the light-emitting elements comprises a first light-emitting unit and a second light-emitting unit. Along a direction perpendicular to a plane of the substrate, both the first opening and the second opening at least partially overlap with the first light-emitting unit. An area of the first opening is greater than an area of the second opening, and an orthographic projection of the second light-blocking layer on the plane of the substrate at least partially covers an edge of the first opening.

A display device comprising a variable-wavelength light emitting diode (LED) is provided. The variable-wavelength LED comprises: an n-doped portion, a p-doped portion, and a light emitting region located between the n-doped portion and the p-doped portion. The light emitting region comprises a light-emitting layer which emits light at a peak emission wavelength under electrical bias thereacross. The variable-wavelength LED is configured to receive a power supply, and the peak emission wavelength of the LED is continuously controllable over an emission wavelength range of at least 40 nm by varying the power supply.

A lighting system and method of driving an array of micro light emitter (microLED) pixels are disclosed. Each pixel contains a blue sub-pixel configured to emit blue light, a red sub-pixel configured to emit red light, a green sub-pixel configured to emit green light, and a yellow sub-pixel configured to emit yellow light. A processor selects, for each pixel to produce white light, between driving the blue sub-pixel and yellow sub-pixel to produce the white light and driving the blue sub-pixel, the red sub-pixel, the green sub-pixel, and the yellow sub-pixel to produce the white light.

A display device includes pixels including light-emitting elements disposed in each emission area. Each of the pixels includes at least one array including the light-emitting elements and disposed in the emission area, and a number of the light-emitting elements disposed in each of arrays of the pixels is greater than aa minimum number of the light-emitting elements in the each of the arrays having a normal distribution or Poisson distribution.

A display device comprises a light emitting diode (LED) which includes a porous semiconductor material, wherein the device comprises a pixel comprising a plurality of subpixels each having a light-emitting layer. A first subpixel has a first light-emitting layer having a first area A1, and a second subpixel has a second light-emitting layer having a second area A2 different from the first area A1. The first subpixel is configured to emit at a first peak wavelength, and the second subpixel is configured to emit at a second peak wavelength different from the first peak wavelength. A method of controlling this display device and a method of manufacturing said display device are also provided.