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What is the FPC in the LCD module?
Speaking of FPC line, you must know or know what FPC is. FPC can be divided into many kinds according to function, such as FPC antenna, FPC touch screen, FPC capacitance screen and so on. FPC line is one of them. Popularly speaking, FPC is the connecting line.
The composition of FPC line
Because the FPC line is a type of FPC, its composition is the same as that of FPC. FPC is generally strip shaped, with two ends designed to be pluggable, which can be directly connected to the connector or welded to the product. The middle of the line is generally, because FPC lines need some flexibility, so the substrate is generally used calendered copper, flexibility, flexibility. FPC line process FPC surface treatment technology used for wiring
It is generally gold, occasionally to prevent oxidation. But the anti-oxidation process can not withstand high temperature, environmental tolerance is worse than gold deposit, both prices are similar, therefore, most of the gold deposit process is used. In addition, there are tin plating technology, but FPC temperature resistance is generally below 280 degrees Celsius, while tin spray will have more than 300 degrees Celsius temperature, and the hardness of the solder paste is small, so it is also rarely used. The function and use of FPC FPC line function is to connect two related parts or products. Now, many products are used in the line, because it has a certain zigzag, in the printer, mobile phone, notebook and many other products have used FPC line.
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12864 LCD module for full screen display operation
Many novices in the use of 12864 LCD module, no matter how the software is written, always found that half of the LCD module can not display, what is the reason? 12864 Chinese LCD module is displayed in the upper and lower half, that is, a 7920 control half. 12864 the graphic dot matrix LCD module is displayed in the left and right sides. So if you want to display the entire lcd module, you need to use chip selection (CS). How to use CS?
When 2 ST7921 chips are needed at the same time, the chip selection foot (CS), also called wafer selection pin, must be used. When the selected signal is set to high voltage, the signal of the synchronous clock signal (SCLK) input will be received. When the selected signal (CS) is set to low voltage, the internal serial number and serial data of the ST7920 will be reset, that is to say, the transmission data will be terminated and the data to be transmitted is reset in this state. Go back to the first place.
ST7920's synchronous clock (SCLK) has an independent operating time, but when a number of successive instructions need to be transmitted, the time of execution of the instruction will need to be considered. It must be confirmed until the previous instruction is fully executed to transmit the next data.
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What is a monochrome LCD screen? What are the features and advantages of it
One, monochrome LCD screen, also commonly known as black and white screen.
Because it can only display a single color and get its name. It can be made into black-and-white characters, blue-and-white characters, yellow-and-black characters, yellow-and-green-and-black characters and so on by changing the polarizer and so on. After technological development and correction, Nanjing ROM LCD has now been able to make color segment LCD screen. The biggest advantage of monochromatic LCD is that the user design is relatively simple, and the I/O port occupied by the master is less.
Two. How to classify monochromatic LCD panels? What are their characteristics?
A and monochromatic LCD have many kinds of classification as follows:
1, the content of its display is classified: segment code liquid crystal screen, graphics dot matrix LCD screen (with Chinese font library and no Chinese font library), character LCD screen
2, from the above technology to classify: Segment LCD, COB LCD, COG LCD, TAB LCD screen.
3, from the background of its display: yellow green LCD, blue film LCD, gray film LCD screen.
4, from the above materials are classified as: VA (BTN), TN, HTN, STN, FSTN. It is possible to use all the materials of the LCD screen. The lattice LCD screen uses STN more than others.
5, the dot matrix screen in addition to the Chinese character library and without Chinese character library, can also be distinguished by dot matrix, such as: 1223212832128641926416012816016024064240128320240 and so on, we most often use the 122321286424064320240.
6, and from the working temperature, divided into normal temperature (-20~70 degrees), wide temperature (lower than -20 or higher than 70 degrees), from the angle of view, 6 point of view, 12 point of view, that is to say the 6 o'clock or 12 o'clock direction of the clock to look at the display.
