TIDA-01635

Backlight and LCD Bias Reference Design for 90-Hz Refresh-Rate Virtual/Augmented Reality Displays

TIDA-01635

Design files

Overview

This reference design describes the power solution for LCD displays in wearable devices, especially in augmented-reality (AR) and virtual reality (VR) headsets. The high current accuracy backlight driver is achieved by LP8556, which provides high current during small duty cycle synchronized with refresh rate. The LCD bias power driver is provided by TPS65132, which is simple to use and has a small package. The detailed design theory, component selection, and test results are also discussed.

Features
  • Strobe backlight with 90Hz
  • Support 50mA with 6 channels
  • Backlight on with 10% duty burst mode
  • Supports one Li-ion battery input or 12-V adaptor input

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.

TIDUE80.PDF (2928 K)

Reference design overview and verified performance test data

TIDRXA4.PDF (148 K)

Detailed schematic diagram for design layout and components

TIDRXA5.PDF (55 K)

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

TIDRXA6.PDF (137 K)

Detailed overview of design layout for component placement

TIDCEX5.ZIP (1866 K)

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

TIDRXA7.PDF (832 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Backlight LED drivers

LP85566 channel high-efficiency/Efficacy LED backlight driver

Data sheet document-pdfAcrobat PDF open-in-new HTML
Boost converters (integrated switch)

TPS6108912.6-V, 7-A Fully-Integrated Synchronous Boost Converters in 2.0-mm x 2.5-mm VQFN Package

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

TPS5632014.5 V to 17 V input, 3 A output, synchronous step-down converter in Eco-mode

Data sheet document-pdfAcrobat PDF open-in-new HTML
LCD & OLED display power & drivers

TPS65132Split-Rail, Single Inductor Dual Output Converter with Positive and Negative Outputs

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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* Design guide Bcklght + LCD Bias Ref Dsign for 90-Hz Refrsh-Rate Virtual/Augmnted Realty Dsply Oct. 22, 2018

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