Provided is an LED comprised of a single mesa epitaxial stack structure with a set of three p-n junctions and having four electrical contact terminals. A polychromatic, multi/full-color emitting, LED chip is assembled with a backplane and has four electrical contact terminals. The polychromatic LED is transferrable and able to be integrated each individually or as a mass array.

A packaging structure and a formation method thereof are provided. The packaging structure includes a base, a semiconductor element, a wrap layer, a cap layer, and an electrical connecting structure. The wrap layer is disposed on the base, covers the semiconductor element, and exposes the top surface of the semiconductor element. The cap layer is disposed on the wrap layer and the semiconductor element and includes a first and a second part. The first part is in contact with the semiconductor element. The second part is in contact with the wrap layer, wherein in measurement results of Fourier transform infrared spectroscopy, the ratio between maximum intensities at wavenumbers of 1060 cm.sup.1 to 1080 cm.sup.1 and 780 cm.sup.1 to 800 cm.sup.1 of the second part is greater than 0.65. The electrical connecting structure passes through the base and the wrap layer to electrically connect to the semiconductor element.

A transparent LED display includes a transparent substrate, pairs of electrodes arranged in an array on the transparent substrate, LEDs each arranged between a corresponding one of the pairs of electrodes, and apertures provided on the transparent substrate, the apertures being areas free of the electrodes and allowing light to pass through, wherein the LEDs are arranged on both of a first surface and a second surface of the transparent substrate, and each of the electrodes on the second surface is arranged in a second surface shielding region including a region that shields a light path extending from one of the LEDS arranged on the first surface through the transparent substrate, and each of the electrodes on the first surface is arranged in a first surface shielding region including a region that shields a light path extending from the LEDs on the second surface through the transparent substrate.

A display may include: a circuit board including a first drive electrode and a second drive electrode; and a light-emitting diodes (LED) including: semiconductor layers stacked in a horizontal direction parallel to a surface of the circuit board, the semiconductor layers including: an n-type semiconductor layer; a light-emitting layer; and a p-type semiconductor layer; a first pixel electrode in contact with the first drive electrode; and a second pixel electrode in contact with the second drive electrode.

A display device includes a lower substrate, a first electrode disposed on the lower substrate, a first light-emitting element disposed on the first electrode, a second electrode disposed on the first light-emitting element, and a second light-emitting element disposed on the second electrode. The first light-emitting element includes a first sidewall and a first bottom surface and the second light-emitting element includes a second sidewall and a second bottom surface. An angle between the first sidewall and the first bottom surface is different from an angle between the second sidewall and the second bottom surface.

A pixel includes an emission area and a non-emission area, a first pixel electrode, a first intermediate electrode, a second intermediate electrode, and a second pixel electrode spaced from each other, first light emitting elements including a first end electrically connected to the first pixel electrode and a second end electrically connected to the first intermediate electrode, second light emitting elements including a first end electrically connected to the first intermediate electrode and a second end electrically connected to the second intermediate electrode, and third light emitting elements including a first end electrically connected to the second intermediate electrode and a second end electrically connected to the second pixel electrode. The second intermediate electrode includes a first portion opposing the first intermediate electrode, a second portion between the first pixel electrode and the second pixel electrode, and a diagonal line portion between the first portion and the second portion.