LTPS is a low-temperature polysilicon screen, LCD is a liquid crystal display screen; LTPs is a branch of polysilicon technology. Each independent pixel can be actively controlled. It is mainly composed of fluorescent tubes, light guide plates, polarizing plates, filter plates, and glass. It is composed of substrate, supporting film, liquid crystal materials, etc., while LCD realizes display by controlling the adjustment of backlight by liquid crystal molecules through electric field. It is mainly composed of LCD panel, backlight module and circuit board.
The operating environment of this tutorial: Windows 10 system, DELL G3 computer.
ltps
The full name of low-temperature polysilicon is "Low Temperature Poly-Silicon (LTPS) , Polycrystalline silicon is also referred to as p-Si, the same below)", it is a branch of polycrystalline silicon technology. For LCD displays, the use of polysilicon liquid crystal materials has many advantages, such as thin film circuits that can be made thinner and smaller, lower power consumption, etc.
In the early days of the development of polysilicon technology, in order to transform the glass substrate from an amorphous silicon structure (a-Si) to a polysilicon structure, a high-temperature oxidation process of laser annealing (Laser Anneal) was necessary. At this time, the glass The temperature of the substrate will exceed 1000 degrees Celsius.
As we all know, ordinary glass will soften and melt at this high temperature and cannot be used normally. However, only quartz glass can withstand such high temperature treatment. Quartz glass is not only expensive but also small in size and cannot be used as a display panel. Manufacturers naturally chose cheap amorphous silicon material (a-Si), which is what we see today.
However, the industry has not given up its efforts, and the development of low-temperature polysilicon technology has become a consensus. After many years of hard work, low-temperature polysilicon has finally gradually become a reality. Compared with traditional high-temperature polysilicon, although low-temperature polysilicon also requires a laser irradiation process, it uses an excimer laser as the heat source. After the laser passes through the transmission system, a laser beam with uniform energy distribution is generated and projected onto the amorphous silicon structure. On the glass substrate, when the glass substrate with amorphous silicon structure absorbs the energy of the excimer laser, it will transform into a polycrystalline silicon structure. Since the entire process is completed below 500-600 degrees Celsius, ordinary glass substrates can also withstand it, which greatly reduces manufacturing costs. It is completely feasible to introduce polysilicon technology into the field of LCD displays. In addition to reduced manufacturing costs, the advantages of low-temperature polysilicon technology are also reflected in the following aspects.
LCD
LCD (abbreviation for Liquid Crystal Display) liquid crystal display. The structure of the LCD is to place a liquid crystal cell between two parallel glass substrates. A TFT (thin film transistor) is set on the lower substrate glass, and a color filter is set on the upper substrate glass. The signal and voltage changes on the TFT are used to control the movement of the liquid crystal molecules. The direction of rotation is used to control whether the polarized light of each pixel is emitted to achieve display purposes. LCD has replaced CRT as the mainstream, its price has dropped a lot, and it has become fully popular.
According to data from CINNO Research, 2020 is expected to be the first year for the mass production and launch of LCD screen fingerprint recognition mobile phones.
Difference
1. Principle of light emission: Each independent pixel of LTPS can be actively controlled. LCD controls the backlight of liquid crystal molecules through electric fields. Source adjustment to achieve display.
2. Composition: LTPS screen is mainly composed of fluorescent tubes, light guide plates, polarizing plates, filter plates, glass substrates, supporting films, liquid crystal materials, etc. LCD screens are mainly composed of LCD panels, backlight modules, and circuit boards.
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