The role of LCD driver chip

LCD driver IC:

LCD liquid crystal screen driver IC is the main part of the display imaging system. It integrates components such as resistors, regulators, comparators and power transistors, including LCD modules and display subsystems. It is responsible for driving the display and controlling the driving current and other functions. It is divided into static There are two methods of driving and dynamic driving.

Driver IC features:

Internal self-built 256khzrc oscillator, external 32.768khz crystal oscillator or 256khz frequency input, internal 32×4bit display. ram can choose 1/2 or 1/3 bias, and 1/2, 1/3 or 1/4. Terminal serial interface duty cycle LCD LCD screen with built-in lcd drive signal source, internal time reference frequency, available command control operation, buzzer drive signal frequency can choose 2khz or 4khz. Data mode and command mode command, with shutdown command can reduce Power consumption, r/w address is automatically accumulated, internal time base generator and wdt. watchdog timer, 3 data storage modes, time base or wdt overflow output, vlcd pin is used to adjust the working voltage chip and directly drive through the analog voltage output The display panel, so its performance will directly determine the display effect of the LCD device, and because it has a large number of high-voltage analog output pins, high-speed low-amplitude digital signal input and other characteristics, it has become a technology hotspot today and is usually integrated in electronic equipment. The liquid crystal display and the corresponding driver chip.

The image display on the liquid crystal panel is realized by the analog voltage provided by the driving chip. LCD driver core. The display mode changes from simple segment type and dot character type to complex dot matrix type and tone type. The display color changes gradually from black and white to color. As the display screen grows from small to large, the response time is gradually shortened. At present, STN displays have advantages in terms of cost and current consumption.

At present, LCD display devices of ST and TFT are commonly used. Since TO is the trend and mainstream of development, we will mainly focus on the LCD driver chip of TO to talk about this type of IC to drive the LCD display of TO. Two kinds of driver chips, GateDriver and Source Driver, are required. The driving voltage of the pigment point, and the Gate Driver controls the strobe state of each row of pixels. In addition, from the application point of view, the applications of LCD display devices for industrial products or portable products are mainly divided into the application fields of large screens (greater than 9 inches) and small screens (less than 9 inches). Under normal circumstances, the small screen application usually chooses the source driver and the gate driver combined with the controller driver to drive, and the large screen device usually uses the separate driving method.