Display Driver IC Display Driver IC DDI A Display Driver IC (DDI) is a key semiconductor chip that controls the operation of the countless pixels that make up a display. Several steps are involved before an image appears on a display. The DDI converts incoming image data into electrical signals required to drive the display panel and controls these signals.
Display Driver Signal Flow Diagram AP(application processor) Image Data DDI(Display Driver IC) T-CON Gate Driver Source Driver Driving Timing(Control Signals) Switching Signal(Gate) Data Voltage(Source) TFT Emission Current Control Liquid Crystal Driving Voltage Control OLED R,G,B Organic Layers LCD Liquid Crystal Layer A DDI consists of a timing controller (T-CON), gate driver, and source driver. When the device's main processor, the application processor (AP), sends image data to the DDI, the T-CON coordinates the timing of pixel operation. Meanwhile, the gate and source drivers deliver switching signals and data voltages, respectively, to the thin-film transistors (TFTs). Based on these signals, the TFTs precisely control the current that drives light emission in OLED displays or the voltage that drives liquid crystals in LCDs, enabling the display to reproduce images with accurate brightness and color.