By Szukang Hsien – Displays are ubiquitous in modern cars, from instrument clusters to center stack touchscreens, head-up displays, rear-seat entertainment, and more. It is estimated that there are up to 12 displays per vehicle in today’s automobiles. The vast automotive display market is dominated by TFT-LCD technologies while OLEDs may play a significant role in the future. For TFT-LCD panels, a majority is still white LED edge-lit displays, which need precise, constant current sink to drive these LEDs.
The display receives power through multiple rails while the video signal receives power through the gigabit multimedia serial link (GMSL). It converts serial LVDS data to a parallel interface in RGB format. A high-voltage buck converter provides the main 5V or 3.3V rail, which feeds the rest of the low-voltage circuits while the high-voltage LDO provides the always-on power to the MCU. The LED driver is usually directly connected to a car battery, which is needed to support lower battery voltage for start-stop systems as well as cold-crank conditions. more>