1. According to the displayed content:
TFT lcd modules can be divided into three types of LCD modules: pen segment type, character type, and graphic point type.
① Stroke segment type TFT liquid crystal display module mainly displays numeral 8 characters and fixed icons in 7 stroke segments.
Advantages: The LCD control driver is connected to the single-chip microcomputer interface, the process is simple, and the price is low. It is widely used in small household appliances such as temperature and humidity meters, electronic scales, multimeters, smart meters, air conditioners, microwave ovens, and rice cookers.
Disadvantage: There is little content displayed.
② Character type TFT liquid crystal display module mainly displays Arabic numerals, English letters and ASCII western characters.
Advantages: The LCD control driver is equipped with an ASCII Western character dot matrix generator, and the single-chip microcomputer only needs to send the ASCII character code to display the corresponding character on the LCD. The price is moderate, especially suitable for Latin alphabet display. Widely used in various industrial control equipment, communication equipment systems, environmental protection series, financial series, etc.
Disadvantage: Only ASCII characters can be displayed, and it is difficult to display characters in a large area.
③ Graphic dot matrix TFT liquid crystal display module mainly displays graphic dot matrix.
Advantages: Full graphic dot matrix operation, single-chip microcomputer operation on the LCD module can realize powerful display functions such as custom icons and drawing operations, and is widely used in monitoring equipment and testing equipment.
Disadvantages: The interface is complicated, and the price of connecting with a single-chip microcomputer is more expensive.
2. According to the display principle of TFT lcd module:
TFT lcd modules can be divided into TN, HTN, STN, FSTN, VA liquid crystal modules.
① TN LCD module adopts TN LCD screen
Advantages: Low power consumption, low price.
Disadvantages: The optical rotation of the TN liquid crystal display is only 90 degrees, resulting in a narrow viewing angle. In addition, the photoelectric response curve of TN liquid crystal is flat, so the display contrast is low.
② HTN LCD module adopts HTN LCD display screen
(Highly twisted nematic) Nematic liquid crystal molecules are sandwiched between two pieces of transparent glass, and between the two pieces of glass, the orientation of the liquid crystal molecules is deflected by 110~130 degrees.
Advantages: High contrast, low power consumption, low driving voltage, and poor dynamic driving performance.
Disadvantage: The viewing angle is wider than that of the TN type.
③ STN LCD screen module adopts STN LCD screen
Advantages: Wide viewing angle, high display contrast, suitable for driving below 240 channels.
Disadvantages: Compared with TN, it is more expensive and can only display monochrome.
④ FSTN LCD module adopts FSTN LCD display screen
In order to improve the background light of ordinary STN, a compensation film is added on the polarizer, which can eliminate dispersion and realize black and white display.
⑤ VA LCD screen module adopts VA LCD screen
The VA panel is a wide viewing angle panel and is commonly used in high-end LCD screens.
Advantages: Black and white contrast is quite high.
Disadvantages: High material cost and high price.