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Original question:

Micro / pico display for projection

DLP3030Q1EVM: PGU unit for Heads up Display

Arshiya Tabassum
Intellectual 975 points
Part Number: DLP3030Q1EVM
Other Parts Discussed in Thread: DLP3030-Q1

Hi, 

I am working in a Head up display project. I am using the reference design:http://www.ti.com/solution/head-up-display-hud?variantid=22362&subsystemid=24904

I want to procure the DLP3030-Q1 Electronics Evaluation Module: https://www.ti.com/tool/DLP3030Q1EVM.  I am trying to understand if I decide to use this EVM, should I purchase the PGU unit separately?

I know there is an off the shelf PGU Evaluation Module by TI : http://www.ti.com/tool/DLP3030PGUQ1EVM?keyMatch=PICTURE%20GENERATION%20UNIT&tisearch=Search-EN-everything. its expensive, but still keeping an option to procure if required.

Here are some questions I was hoping to get answers for:

1. If I decide to use the electronics module, what are the components I would need to buy separately to achieve the primary functionality of the head up display?

2. What kind of pico/micro display can be used to project the image onto a screen? 

3. Do I have to procure separately and connect the components- Buffer/Drivers, Temp Sensor, OpAmp, photo diode, buck passives, bias power, low side drivers and FETs as shown in the reference design below?

Application processor EVM: DRA71x Evaluation Module

Reference Design: http://www.ti.com/solution/head-up-display-hud?variantid=22362&subsystemid=24904

I look forward to your response. 

Thank you,

Arshiya Tabassum

  • 0
    TI__Genius 11385 points

    Hi Arshiya,

    Regarding your questions,

    1. If I decide to use the electronics module, what are the components I would need to buy separately to achieve the primary functionality of the head up display?

    The items you will need are the illumination and projection optics, RGB LEDs, and a photodiode.

    2. What kind of pico/micro display can be used to project the image onto a screen? 

    You need an optics engine. I don't have much information on where to get this besides the PGU EVM that we also sell. Some of our customers use their own optics engine.

    3. Do I have to procure separately and connect the components- Buffer/Drivers, Temp Sensor, OpAmp, photo diode, buck passives, bias power, low side drivers and FETs as shown in the reference design below?

    No, the electronics only EVM has most of those components, but you do need the photo diode for good performance. The major external interfaces on the EVM are for the RGB LEDs, RGB LED thermistors, photodiode, power cable (to connect to a power supply), and communication interface (to connect to provided software GUI).

    There are more information here as well:

    https://www.ti.com/lit/ug/dlpu056/dlpu056.pdf?&ts=1589412753182 

    I think this has some very good information on what is needed to evaluate the system without the complexity of a full schematic. The schematic page of the reference design also has a block diagram if you wish to dig deeper.

    Hope this helps, let me know if you have more questions.

    Peng

  • 0 in reply to Pengzhao Zhu
    Intellectual 975 points

    Sure, thank you Peng for the reply.

    I am looking into analyzing the total cost of the whole PGU module versus buying individual components.  Can you please verify if I can use  the following components with DLP3030-Q1?

    1. For the RGB LEDs , can I use this product (OSRAM -recommended by TI) ?

    https://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/LRTB-R48G-P9Q7-1-R7S5-26-N5P-68-ZB/475-3483-2-ND/7908261

    2. For the photo diode can I use this product?

    https://www.digikey.com/product-detail/en/vishay-semiconductor-opto-division/VEMD1060X01/VEMD1060X01CT-ND/5879093

    I look forward to hearing from you!

    Thank you,

    Arshiya Tabassum

  • 0 in reply to Pengzhao Zhu
    Intellectual 975 points

    Also, for the optics engine, as you mentioned, there are no off the shelf engines that I can purchase.  What components can I gather apart from Diffuser and  combiner, in the optics engine I might need, if you can guide me that would be helpful.

  • 0 in reply to Arshiya Tabassum
    TI__Genius 11385 points

    Hi Arshiya,

    It seems like the LEDs you proposed are only rated for low current use ( ~100 mA peak pulsed current). The LEDs are on our EVM are rated for high current applications (~6-8 A peak pulsed current) to get a bright display projection. As this is a high current path, separate mechanical heatsinks are also typically needed for each of the LEDs.

    For reference, you can look up the OSRAM Q8WP RGB LEDs online. We also use these LEDs quite often in our newer auto display products.

    In general, customers either buy our PGU EVM or design their own unit to evaluate the electronic unit. The design of the optical module is not trivial as it includes both optical and mechanical design. It will need to have the necessary optics to capture and project the light properly while maintaining good thermal performance (mechanical heatsink). The placement of the photodiode is also part of this process and this makes the selection of a photodiode an non-trivial topic.

    Regards,

    Peng