Automotive TFT LCD display solution

This reference design implements a video over LVDS solution for automotive infotainment applications.It highlights the support of multi-touch with haptic feedback, LCD backlight control, and ambient light sensing, without the introduction of dedicated support lines back to the host processor. This design is implemented using two boards. The main electronics board, SAT0059 is where the deserializer, microProcessor, backlight controller, haptics drivers and power supply are located. The LCD interface board, SAT0096, is a physical and electrical interface to a specific LCD panel. It connects to the SAT0059 through a Samtec board to board connector and provides connection points for the LCD panel, touchscreen, backlight connections and haptic drivers. The SAT0096 is designed for a Microtips UMSH-8596MD-20T display. If a different display is to be used, a new LCD Interface board would likely need to be designed.

Features:

• Wide input voltage range: off battery 4.5V to 40V power supply
• All video and support communications through LVDS
  o   Supporting 24 bit RGB Video
  o   400Kbps back channel I2C connection for multi-touch input

• Haptic feedback
• State of art I2C/SPI interface LED backlighting controller with dimming ratio of >10,000:1,
  o   switching frequency ~2.2MHz, hybrid dimming and saftey and fault tolerances/functions
• Backlight adjustable to inputs
  o   Ambient light sensor
  o   Thermistor inputs on the LCD and the back light to enable thermal protection

Parts Include:

DRV2667                Piezo Haptic Driver with Boost, Digital Front End, and Internal Waveform Memory 

DS90UH925Q-Q1   5 – 85 MHz 24-bit Color FPD-Link III Serializer with HDCP 

DS90UH926Q-Q1   5 – 85 MHz 24-bit Color FPD-Link III Deserializer with HDCP 

LM25011-Q1          Automotive 6-42V Wide Vin, 2A Constant-On Time Non-Synchronous Buck Regulator w/ Adj Current Limit 

LP8860-Q1             Automotive Low-EMI High-Performance 4-Channel LED Driver  

TPS22965-Q1         5.5V, 4A, 16mΩ Automotive High-Side Load Switch With Adjustable Rise Time & Quick Output Discharge 

Learn more by downloading the reference design below