How is the LCD segment code screen driven? Let's introduce it below.
The first step: It is necessary to meet several important values of LCD segment code LCD screen driving: working voltage, duty cycle and bias ratio. These three parameters are very important and all need to be met.
Step 2: Driving method: According to the driving principle of LCD, you can know that only AC voltage can be applied to the pixels of LCD. The contrast of LCD display is the difference between the voltage value on the COM pin and the voltage value on the SEG pin. When this voltage difference is greater than the saturation voltage of the LCD, the pixel can be turned on, and when it is less than the LCD or the value of the voltage, the pixel can be turned off. The LCD-type MCU has automatically generated the LCD drive signal by the built-in LCD drive circuit. Therefore, only the I/O port can simulate the output of the driving signal to complete the driving of the LCD.
The segment code LCD screen mainly has two kinds of pins: COM and SEG, which are very similar to the digital tube, but the pressure difference must be changed, for example: the first moment is positive 3V, then the second moment must be The reverse is 3V. Pay attention. If you apply DC power to the segment LCD screen, the screen will be scrapped in a short time, so be careful.
