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What is Micro LED Written by HC AUTOMATOIN / Read 695 times
    Micro LED technology, that is LED miniaturization and matrix technology. It refers to a high-density and tiny-sized LED array integrated on a chip. For example, each pixel of the LED display can be addressed and driven individually. It can be regarded as a miniature version of the outdoor LED display which down to the micron level.

Micro LED display, on the other hand, uses a normal CMOS integrated circuit manufacturing process to make an LED display drive circuit at the bottom layer, and then uses a MOCVD machine to make an LED array on the integrated circuit, thereby realizing a miniature display, which is the so-called miniature version of the screen of LED display.

The advantages of Micro LED are obvious. It inherits the characteristics of high efficiency, high brightness, high reliability and fast response time of inorganic LED, and has the characteristics of self-illumination without backlight, more energy saving, simple structure, small size, thin and other advantages.

The electro-optical conversion efficiency is higher and the power consumption is low. At present, the power consumption of the display screen accounts for about 30% of the total power consumption of the mobile phone in daily use. Micro LED realizes color display, there are two main solutions, RGB three-color LED method, ultraviolet (UV) LED/blue LED + luminescent medium method. The RGB three-color scheme means that each pixel contains three RGB three-color LEDs. Generally, the positive and negative electrodes (P and N electrodes) of each LED are connected to the circuit base by flipping or checking. Each LED chip is addressed and independently driven by a full-color LED driver chip to display imaging.

Since each pixel can be individually controlled and driven, its performance parameters such as resolution, brightness, contrast, and power consumption are excellent, not inferior to OLED. It is estimated that under the same brightness, Micro LED saves about 50% power than OLED. For mobile phones, screen power consumption accounts for 40%-80% of the overall power consumption, Micro LED power consumption is about 50% of OLED, and 10% of LCD; for smart watches, the main power consumption lies in CPU And the display, if the OLED screen of the smart watch is changed to Micro LED, the battery life is expected to increase by 50%.    ●Good stability and long service life. Compared with OLED screens made of organic materials, Micro LEDs are made of inorganic materials, which are not affected by water vapor, oxygen or high temperature

●No size development restrictions. Micro LED can easily be used in various application scenarios such as medium and small size displays to medium and large size displays. At present, the pixel size of LED displays is in the order of centimeters and millimeters, resulting in unsatisfactory image display. Micro LED technology with smaller pixel size has great application potential in this regard. As a display screen used in mobile phones, wearable devices, and VR/AR devices, Micro LED displays have the characteristics of low power consumption and high resolution, and can improve the user experience.

●Super fast switching time. The switching speed of Micro LEDs is measured in nanoseconds (billionths of a second). The ultra-high resolution of the ultra-small size combined with the ultra-fast switching speed enables Micro LEDs to be the perfect choice for VR and AR headsets. In addition, another major feature of Micro LED is its ultra-high resolution. Because of its ultra-small size, the performance resolution is particularly high; it is said that if the Apple iPhone 6S uses micro LED, the resolution can easily reach 1500ppi or more, which is 3.75 times higher than the 400PPi displayed by the original Retina. Compared with OLED, its color is easier and more accurate to debug, has longer luminous life and higher brightness, and has the advantages of better material stability, long life, and no image burn-in. Therefore, it is another display technology after OLED with the advantages of lightness, thinness and power saving. The commonality with OLED is that it also needs to be driven by a TFT backplane, so the TFT technology grades are IGZO, LTPS, and Oxide.