Abstract
Compared with conventional display technologies, liquid crystal display (LCD), and organic light emitting diode (OLED), micro-LED displays possess potential advantages such as high contrast, fast response, and relatively wide color gamut, low power consumption, and long lifetime. Therefore, micro-LED displays are deemed as a promising technology that could replace LCD and OLED at least in some applications. While the prospects are bright, there are still some technological challenges that have not yet been fully resolved in order to realize the high volume commercialization, which include efficient and reliable assembly of individual LED dies into addressable arrays, full-color schemes, defect and yield management, repair technology and cost control. In this article, we review the recent technological developments of micro-LEDs from various aspects.
Highlights
Owing to the fact that III-nitride-based light-emitting diodes (LEDs) are more efficient, reliable, and have longer life span in comparison to traditional lighting sources, such as incandescent and fluorescent bulbs, they are increasingly being employed as an energy-saving solution for various applications, among which are general lighting, automobile, signal, and backlighting in displays.Conventionally, to provide sufficient light power for general lighting, lateral dimensions of LED chips are designed to be larger than 200 μm × 200 μm
Traditional liquid crystal display (LCD) display requires LED backlight to emit light through a matrix of liquid crystal to generate images, and it suffers from the issues of high power consumption, slow response time, low viewing angle, and low uniformity
The first one is based on mass transfer, i.e., the so called pick-and-place approach, which includes picking up each have individual micro-LED, and precisely positioning it onto the individual backplane, Two different approaches been utilized to assemble displays constructed from followed electrically connecting it to the driver
Summary
Owing to the fact that III-nitride-based light-emitting diodes (LEDs) are more efficient, reliable, and have longer life span in comparison to traditional lighting sources, such as incandescent and fluorescent bulbs, they are increasingly being employed as an energy-saving solution for various applications, among which are general lighting, automobile, signal, and backlighting in displays. Traditional LCD display requires LED backlight to emit light through a matrix of liquid crystal to generate images, and it suffers from the issues of high power consumption, slow response time, low viewing angle, and low uniformity. Micro-LED displays possess potential advantages such as high contrast, fast response, and relatively wide color gamut, low power consumption, and long lifetime. TV panel in 2012, which featured six million micro-LEDs. Compared with the existing Sony LCD and plasma displays, the micro-LED prototype features 3.5 times higher contrast ratio, 1.4 times wider color gamut, and 10 times faster response time. Has demonstrated 12.1 inch full-color micro-LED display with a 169 PPI and 1920 × 720 resolution achieved by micro-LEDs with pixel size less than 30 microns. Current bottlenecks and likelihood of overcoming them are discussed
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