A display device comprises: a pixel circuit layer, a bonding electrode on the pixel circuit layer, a first electrode on the bonding electrode, a light-emitting element on the first electrode and configured to emit light of a first color, a second electrode on the light-emitting element, a distributed Bragg reflective layer on the second electrode, and a color filter on the distributed Bragg reflective layer and transmitting light of a second color.

A display device is disclosed that includes a substrate, a bank layer disposed on the substrate, and a reflective layer disposed on a side surface of the bank layer and in contact with a light-transmitting layer, a second color quantum dot layer or a third color quantum dot layer, wherein the bank layer and the reflective layer together have a length of 1 m or less in a direction parallel to the substrate.

A semiconductor device is provided. The semiconductor device includes a semiconductor structure, an outer electrode structure, an inner electrode structure, and an adjustment structure. The semiconductor structure includes a first portion and a second portion, wherein the second portion is on the first portion and includes an active region. The outer electrode structure is on the first portion of the semiconductor structure and has a first top surface. The inner electrode structure is on the second portion of the semiconductor structure and has a second top surface. The adjustment structure covers the semiconductor structure and is in contact with the outer electrode structure and the inner electrode structure, and the adjustment structure has a third top surface. The third top surface is substantially coplanar with either the first top surface, the second top surface, or both.

Disclosed are a micro-display chip and a preparation method thereof. The micro-display chip includes: a self-luminescence layer, a wavelength conversion layer, and a first transmitting-and-reflecting layer and/or a second transmitting-and-reflecting layer; the first transmitting-and-reflecting layer is disposed between the self-luminescence layer and the wavelength conversion layer; the second transmitting-and-reflecting layer is disposed on another surface of the wavelength conversion layer; the first transmitting-and-reflecting layer has low reflectivity and high transmissivity for the first color light and high reflectivity and low transmissivity for the second color light, and the second transmitting-and-reflecting layer has high reflectivity and low transmissivity for the first color light and low reflectivity and high transmissivity for the second color light. The micro-display chip of the present disclosure can effectively improve the absorbance and color purity of conversion light, thereby obtaining a brighter and purer conversion spectrum.

Arrays of light emitting diode (LED) devices in which each LED device includes a mesa having a top surface and at least one sidewall defining a trench having a bottom surface. The mesa comprises semiconductor layers including an n-type layer, an active layer, and a P-type layer, and an electrically conductive material fills the trench. An n-contact, which can be a transparent conductive oxide (TCO) layer, lines an entire surface of the sidewall and trench bottom, and a dielectric layer lines an entire length of the TCO layer, such that the dielectric layer optically isolates the trench and the n-contact functions as an n-contact and spreading layer.

A micro multi-color LED device includes two or more LED structures for emitting a range of colors. The two or more LED structures are vertically stacked to combine light from the two more LED structures. In some embodiments, each LED structure is connected to a pixel driver and a shared P-electrode. The LED structures are bonded together through bonding layers. In some embodiments, reflection layers are implemented in the device to improve the LED emission efficiency. A display panel comprising an array of the micro tri-color LED devices has a high resolution and a high illumination brightness.

In one aspect, the disclosure relates to micro-LED based AR displays combining stacked red, green, and blue LEDs, distributed Bragg reflectors, and diffractive optics; methods of making the same; and augmented reality displays using the same. In one aspect, the light generated by the LEDs is reflected within the optical cavity of DBR/LED/DBR, creating a highly directional (5) and monochromatic (FWHM5nm) blue light. In an aspect, the luminance of the disclosed inorganic-based micro-LEDs is orders of magnitude higher than that of organic LEDs while also providing high directionality and monochromaticity, leading to higher image quality. In a further aspect, the small size of the disclosed light source and combiner allows a much more compact and light-weight AR device to be constructed.

A display device includes a pixel electrode and a common electrode on the substrate and spaced from each other, a light emitting element including a first contact electrode on the pixel electrode and a second contact electrode on the common electrode and a first connection electrode that electrically connects the first contact electrode and the pixel electrode, and a second connection electrode that electrically connects the second contact electrode and the common electrode, wherein the light emitting element further includes: a plurality of semiconductor layer stacks, a protective layer around sides of the plurality of semiconductor layer stacks except one side and a reflective layer around the plurality of semiconductor layer stacks on the protective layer, wherein the protective layer and the reflective layer protrude from a top end of the semiconductor layer stack to an outside perpendicular to the side of the semiconductor layer stack.

A display device includes a bank including an opening defining pixels, light emitting elements disposed in the pixels, a color conversion layer disposed on the light emitting elements in the opening, a capping layer overlapping the color conversion layer, and a color filter layer disposed on the capping layer. The color filter layer includes a low refractive material.

A display apparatus includes a circuit board including a driving circuit, a pixel array on the circuit board and including unit pixels, each of the unit pixels including a plurality of subpixels, and a plurality of microlenses respectively on the plurality of subpixels, where the pixel array further includes a plurality of light-emitting diode (LED) cells each respectively including a first conductivity-type semiconductor layer, an active layer, and a second conductivity-type semiconductor layer that are sequentially stacked, a passivation layer on side surfaces and lower surfaces of the plurality of LED cells, a reflective layer on the passivation layer, the reflective layer configured to emit light toward upper surfaces of the plurality of LED cells, a gap-fill insulating layer on the side surfaces and lower surfaces of the plurality of LED cells, and a first connection electrode on the gap-fill insulating layer, and connected to the first conductivity-type semiconductor layers.