Brief introduction of micro LED technology

There are many similarities between micro led and OLED, so compared with LCD, the comparison between micro led and OLED is easier to understand. First of all, we can see from the name that there are LEDs, so they are mainly composed of light-emitting diodes. Therefore, both technologies adopt the form of self illumination. Each red, green and blue sub-pixel can generate its own light source, instead of requiring special backlight components like LCD. Therefore, micro LED display can also provide high contrast and black level, which is the same as OLED, and a Tft Panel provides energy for each pixel.

Micro LED technology, i.e. led miniaturization and matrix technology, is simply to thin-film, miniaturize and array the LED backlight, which can make the LED unit less than 50 microns. Like OLED, each pixel can be individually addressed and independently driven to emit light (self illumination). Its advantage is that it not only inherits the characteristics of inorganic led such as high efficiency, high Brightness, high reliability and fast reaction time, but also has the characteristics of self illumination without backlight, small size, light and thin, and can easily achieve the effect of energy saving.

From the perspective of structural principle, micro LED is simpler and has better effect. TFT substrate, ultra-fine LED crystal and driving IC are not big problems, but its biggest problem is known as huge transfer. How to miniaturize led requires wafer level technology. For example, 4K level micro LED screens need more than 8 million LEDs to be highly integrated together, so it is extremely difficult to apply them to Small-size screens in theory, and the cost and heating are also very considerable. The 146 inch selection of Samsung's first micro LED TV is also the reason for this.

The difference between micro led and OLED lies in the material composition of LED part. "O" in OLED represents organic material, which refers to the use of organic material in the pixel stack that can produce light. Micro LED technology uses inorganic gallium nitride material, which is commonly used in ordinary LED lighting products. This technology can reduce the requirements of polarization and packaging layer, and make the display panel thinner. So the components of micro LED are very small, less than 100 μ m wide, and thinner than human hair.