—According to the displayed content:
TFT LCD modules can be divided into three types of LCD modules: pen segment type, character type, and graphic dot type. 1. Stroke segment type TFT LCD module mainly displays 7 stroke segments with 8 characters and fixed icons.
Advantages: The LCD control drive is connected to the single-chip interface, the process is simple, and the price is low. It is widely used in small household appliances such as thermometers and hygrometers, electronic scales, multimeters, smart meters, air conditioners, microwave ovens, rice cookers, etc.
Defects: Less content is displayed.
⒉. Character type TFT liquid crystal display module mainly displays Arabic numerals, English letters and ASCII Western characters.
Advantages: LCD control driver is equipped with ASCII Western character dot matrix generator, and the single-chip microcomputer only needs to send the ASCII character code to display the corresponding characters on the LCD. The price is moderate, especially suitable for the Latin alphabet to appear. It is widely used in various industrial control equipment, communication equipment systems, environmental protection series, financial series, etc.
Defect: Only ASCII characters can be displayed, and it is difficult to display characters in a large area. 3. Graphic dot matrix TFT type liquid crystal display module mainly displays graphic dot matrix.
Advantages: full graphics dot matrix operation, single-chip microcomputer operation on the LCD module can complete powerful display functions such as custom icons, drawing operations, etc. It is widely used in monitoring equipment and testing equipment.
Defects: The interface is complicated, and the price is more expensive than the one-chip computer connection. 2. According to the display principle of TFT liquid crystal display module:
TFT LCD modules can be divided into TN, HTN, STN, FSTN, VA LCD modules. 1. TN LCD module adopts TN LCD screen.
Advantages: low power consumption and low price.
Defect: The rotation of the TN LCD display screen is only 90 degrees, resulting in a narrow viewing angle. In addition, the photoelectric response curve of TN liquid crystal is flat, so the apparent specific illuminance is low.
2. HTN LCD module adopts HTN LCD display screen.
(Highly twisted nematic) Nematic liquid crystal molecules are sandwiched between two transparent glasses. Between the two glasses, the orientation of the liquid crystal molecules is deflected by 110 to 130 degrees.
Advantages: high specific illuminance, low power consumption, low drive voltage, poor dynamic drive performance. Defect: The viewing angle is wider than TN type.
3. STN LCD screen module adopts STN LCD screen.
Advantages: wide viewing angle, high display specific illuminance, suitable for driving under 240 channels. Disadvantages: Compared with TN, the price is higher, and it can only show a single color.
4. FSTN LCD module adopts FSTN LCD display screen.
In order to improve the background scenery of ordinary STN, a compensation film is added to the polarizer, which can eliminate the dispersion and complete the black and white display. 5. VA LCD screen module adopts VA LCD screen.
VA panels are wide viewing angle panels and are commonly used in high-end LCD screens. Advantages: The contrast between black and white is quite high.
Defects: high cost of consulting materials, high price line
