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Transparent window display

Products and reference designs
Block diagram

Transparent window display

Block diagram

Overview

A projector-based transparent window display consists of a small projector mounted inside the vehicle and a transparent film that is typically sandwiched or laminated in the vehicle's side, rear or even front window. Applications for a transparent window display include traditional and autonomous ride-sharing/hailing, advertisement, interior entertainment, vehicle diagnostics, driver greeting or car entry touchscreen.

Design requirements

Transparent window display designs require:

  • High optical output power for daytime brightness.
  • Phosphor or multi-color films for light emission from 405 nm or RGB projector.
  • Automotive DLP 405 nm or RGB chipsets.
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Block diagram

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Transparent window display

VBAT VBAT Off-battery power Off-battery power Wide VIN UV/OV voltage supervisor Wide VIN UV/OV voltage supervisor Wide VIN buck Wide VIN buck Wide VIN switch Wide VINswitch Wide VIN LDO Wide VIN LDO Wide VIN boost Wide VIN boost Reverse battery protection Reverse battery protection VBAT_RBP VBAT_RBP Contols to AP’s power supplies Contols to AP’s power supplies Vehicle CAN bus Vehicle CAN bus Vehicle LIN bus Vehicle LIN bus Display video interface Display video interface Deserializer Deserializer LDO LDO 1.8V 1.8V 3.3V 3.3V Ethernet Ethernet Vehicle CAN bus Vehicle CAN bus RGB/LED RGB/LED Ambient light sensor Ambient light sensor Ambient light sensor Ambient light sensor Photodiode Photodiode -------------- OR -------------- -------------- OR -------------- Op amp Op amp Multiplexer (gain control) Multiplexer(gain control) ---------------OR--------------- ---------------OR--------------- RGB/LED RGB/LED Remote processor Remote processor I2C I2C Deserializer I2C back-channel Deserializer I2C back-channel DMD, DMD controller, & LED illumination DMD, DMD controller, & LED illumination DMD controller DMD controller DMD DMD Temp sensor Temp sensor Op amp Op amp DDR memory DDR memory Flash memory Flash memory Clock Clock Dimming management MCU Dimming management MCU ADCs and analog comparators ADCs and analog comparators DMD and system power management DMD and system power management ---------------------OR--------------------- ---------------------OR--------------------- System boot & monitoring System boot & monitoring ESD protection ESD protection CAN transceiver CAN transceiver Vehicle interface processor (VIP) MCU Vehicleinterfaceprocessor(VIP)MCU Voltage rails sequencer Voltage rails sequencer Low IQ voltage supervisor Low IQ voltage supervisor ESD protection ESD protection LIN transceiver LIN transceiver Application processor Application processor Digital logic Digital logic CAN FD transceiver CAN FD transceiver MPU MPU Memory subsystem Memory subsystem DSP DSP Video accelerator Video accelerator Comm. I/O Comm. I/O Ethernet PHY EthernetPHY OR OR ESD protection ESD protection ESD protection ESD protection Voltage translator Voltage translator Applications processor (AP) Applications processor (AP) Multi-channel voltage supervisor Multi-channel voltage supervisor Non-volatile memory Non-volatile memory DDR memory termination DDR memory termination DDR memory DDR memory Voltage supervisor +watchdog Voltage supervisor +watchdog Debug console Debug console

Technical documentation

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Type Title Date
White paper Designing infotainment systems that are interactive not distractive 15 Mar 2019
Technical article Creating vehicle-to-pedestrian communication using transparent window displays PDF | HTML 14 Sep 2023

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