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Monochromatic Lightcrafter 4710 without optics

Attila Saghy
Prodigy 40 points
Other Parts Discussed in Thread: DLPC3439, DLPC300, DLP4710

Hello

We would like to use only the electronics of the Lightcrafter 4710. I think it is possible to build out the display and use it without the optics.

Does TI offer the standalone electronics without the optics? 

Additionally: we don't need color images, we would like to illuminate the display only with one LED.

Is it possible then to achieve a higher frame rate? You specify 60Hz RGB and 120Hz in 3D mode. 

Would it mean, that with monochrome illumination we could reach 180 and 360 Hz?

Thank you!

Attila

  • 0
    TI__Genius 10495 points

     Hello Attila,

    Thank you for your interest in our DLP Technology. We currently don't over the PCB without the optical engine.

    The frame rate is limited by the input clock frequency and the input resolution. The DLPC3439 has an input clock frequency of 150MHz which limits the frame rate to 62Hz for a 1920x1080 resolution.  

    Driving only one LED will not increase the max. input frame rate.

    Best regards,

    Nadine

  • 0 in reply to Nadine Estermann
    Prodigy 40 points

    Hello Nadine

    First of all thank you very much for your quick help!

    I think, I have explained the idea very good, excuse me.

    My understanding of the DLP colors is based on the description of the DLPC300.

    In this description it is explained, when a 24bit image is displayed at 60Hz, then all colors are divided up equally in a frame and have a 5,55ms time slot. This time slot is then divided up further on bit planes and so is the image displayed. The DMD is illumianted time sequentially with the RGB LEDs.

    This time slot of 5,55ms gives 180Hz if we don't have colors.

    Our idea is:

    Instead of the RGB LEDs, we would use only one white LED. The LED would be driven with all the RGB signals. So the white LED would illuminate the display in all the three 5,55ms time slots.

    The input signal would remain 60Hz, but we would use the color planes to encode further images.

    I think one can achieve so a higher monochromatic frame rate.

    What do you think : could we achieve that way a higher "monochromatic" frame rate?

    Kind regards, Attila

  • 0 in reply to Attila Saghy
    TI__Genius 10495 points

    Hello Attila,

    Yes you would be able to achieve 180Hz frame rate if the time slots would be equally distributed for each color.

    Our current firmware for the DLPC3439 does not equally distribute the time slots for each color. We would have to provide  a new firmware for your specific use case.

    Have you looked into our DLP LightCrafter 6500 EVM ? This EVM might be a better fit for your use case.

    Best regards,

    Nadine

     

  • 0 in reply to Nadine Estermann
    Prodigy 40 points

    Hello Nadine

    Thank you for your response!

    The 4710 display seems for us the perfect solution. At least geometrically. We would like to try something in the lab and I wouldn't like to build complicated optics. The mirror tilt angle of 17deg is here a huge advantage if I compare with other displays. Additonally the display and the electronics seems to be also very small. The only problem is the speed and we need to find here a solution.

    Where do I find additional information, how the time slot are splitted? I knew the the description of the DLPC3439. but I don't find this part in the document.

    An another option and possiblity, what is see here - to increase the frame rate - is to use the 3D mode.

    As I understand one can display 3D data, if the images have smaller resolution. This is an another and probably a clear way to increase the frame rate. So we could achieve 120Hz. Is is correct so?

    I knew the EVM 6500. This is also a nice product. However the geometry is not optimal for us. Of course if we don't find a solution for increasing the speed, then we need to choose an another display.

    Thank you again for your help!

    Best wishes, Attila

  • 0 in reply to Attila Saghy
    TI__Genius 10495 points

    Hello Attila,

    Unfortunately we don't really have any documentation regarding the time slot splitting available on Ti.com.

    As I mentioned before the real limiting factor for the frame rate is the clock frequency of 150 MHz and the resolution. The datasheet specifies the frame rates we validated and tested.

    A clock frequency of 150 MHz will allow a frame rate of 120 Hz with a input resolution of 1280x720. What is the frame rate and resolution you would like to achieve ?

    Best regards,

    Nadine

     

  • 0 in reply to Nadine Estermann
    Prodigy 40 points

    Hello Nadine,

    thank you for your answer!

    Could we get here some information regarding the time slots?

    We don_'t need the full resolution: the 120Hz and 1280x720 is fine for us. So this seems to be a solution.

    Actually we would need only a squre area from the display. 

    Would it be possible, that we adress only 1080 x 1080 pixels in the middle with a higher frame rate (for example 120Hz)?

    Kind regards,

    Attila

  • 0 in reply to Attila Saghy
    TI__Genius 10495 points

    Hello Attia,

    The DLP4710 chipset is mainly for display application. Therefore to achieve the ideal white point we don't equaly distribute the color time slots. So in the current firmware the Green LED has more time slots than Red and Blue. This can be changed by adjusting the firmware.

    Unfortuantely we don't support partial image updates. So we can not address pixel by pixel separately.

    Please let me know if you have any further questions.

    Best regards,

    Nadine