Character LCD Modules in SCM System

The LCD module uses a CCFL backlight, which is a cold cathode fluorescent lamp, high brightness, low power consumption, applicable to large-area displays the desired light, but requires the corresponding inverter. The system uses PYE-L10A inverter, which consists of the typical differential pair oscillation circuit, its output through a capacitor is divided into two, two lamps can be lit simultaneously. It is easy, +5 V input voltage, the output is AC 1300V (7mA) around the frequency 20 ~ 30kHz, with minimal conversion loss and a high output efficiency. Overall dimensions of 43 × 20 × 13.7mm. Usually installed in the MCU control panel, two AC output terminal is connected with the high-voltage leads and LCD. Because CCFL uses high voltage power supply, so when used with care to prevent damage due to high pressure shorting other devices. In addition, the use of lead should also note that the interface should not be too long, do not use cable as its output line. Character LCD Display

Generally, LCD liquid crystal display device is driven by a constant voltage to establish an electric field to achieve. Since the LCD typically requires a negative voltage drive power. Therefore, the drive circuit to generate a negative voltage converter chip. The DC-DC input voltage of 5V, the input current of 60mA, the board has the adjustment potentiometer, the output voltage can be negative -2 ~-22V is adjustable to suit the Graphic LCD Display