Automotive 144-Zone Local Dimming Backlight Reference Design


Design files


This local dimming backlight reference design conserves power, extends the life of liquid-crystal displays (LCDs), and enhances automotive display quality through high dynamic range (HDR) or localized dimming technology. Seven multi-channel constant-current LED drivers allow for 144-zone localized dimming via pulsewidth modulation (PWM) on-time and current-level brightness configuration. A single serial interface allows daisy-chaining of the LED drivers for brightness and configuration programming. Temperature and ambient light sensors enable sensing of the surrounding conditions to protect from overtemperature scenarios and adjust the global brightness based on ambient brightness.

  • Individually dim backlight zones saves power, prevents backlight bleed, and realizes HDR and local dimming solutions
  • High-voltage transient and reverse battery protection
  • Ambient light sensing with excellent human eye spectral response matching with strong IR rejection (<1%)
  • Dynamically adjusts backlight brightness on logarithmic scale based on human eye and perception of brightness
  • Direct-lit backlight configuration
  • Single-chip sensing solutions without thermistors or photo-diodes
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEA1.PDF (5914 K)

Reference design overview and verified performance test data

TIDRX84.PDF (497 K)

Detailed schematic diagram for design layout and components

TIDRX85.PDF (37 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRX86.PDF (435 K)

Detailed overview of design layout for component placement

TIDRX88.ZIP (2154 K)

Files used for 3D models or 2D drawings of IC components

TIDCEW8.ZIP (1775 K)

Design file that contains information on physical board layer of design PCB

TIDRX87.PDF (3079 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog temperature sensors

LMT87-Q1Automotive ±2.7°C 2.7V to 5.5V analog output temperature sensor with -13.6 mV/°C gain

Data sheet: PDF | HTML
Automotive LED drivers

TLC6C5716-Q1Automotive 16 channel Full diagnostics constant current RGB LED driver

Data sheet: PDF | HTML
Automotive LED drivers

TLC6C5724-Q1Automotive 24 channel Full diagnostics constant current RGB LED driver

Data sheet: PDF | HTML
Buck converters (integrated switch)

LMR14030-Q1SIMPLE SWITCHER® Automotive 40-V, 3.5-A, 2.2-MHz step-down converter with 40-uA IQ

Data sheet: PDF | HTML
Ideal diode/ORing controllers

LM74700-Q13.2-V to 65-V, 80-uA IQ automotive ideal diode controller

Data sheet: PDF | HTML
Light sensors

OPT3001-Q1Automotive digital ambient light sensor (ALS) with high-precision human-eye response

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A52-Q1Automotive 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML
Load switches

TPS22918-Q11-ch, 5.5-V, 2-A, 52-mΩ automotive load switch with adj. rise time and adj. output discharg

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Automotive 144-Zone Local Dimming Backlight Reference Design Oct. 04, 2018

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