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Original question:

DLP3010: How to set 120Hz frame rate and 1440Hz color frame rate on DLP3010?

DLP3010: Questions about 120Hz 3D input source

CHIA WEI YU
Intellectual 370 points
Part Number: DLP3010
Other Parts Discussed in Thread: DLPC3430, DLPC3433, DLPA2000, DLPC3438, DLP230GP, DLPC3432

Hi Expert,

I'd like to drive DLP3010 with 120Hz 3D input source. 

The 120Hz timing is confirmed by the vendor of the optical engine.

It's at Look 1.

Then, I modified the EDID setting for 120Hz timing and also enable Vsync to check if it's 120Hz or not.

Then, I got that Vsync is 120Hz. But, the display is abnormal. 

Here are 2 questions.

1. What is DSI host timing requriements for 120Hz 3D mode? 

So far, I only have the requirement for 60Hz.

2. Is there anything else I need to modify?

BR,

Wilbur. 

1.tif 

  • 0
    TI__Mastermind 22830 points

    Hello Wilbur,

    What hardware are you using? Is this a TI EVM or a board built by you?

    Are you using DSI interface? Is it working at 60Hz frame rate?

    In case you are using  DSI interface, please refer DLPC3430 datasheet for details of DSI and limitation. The DSI capability in both devices are same.

    https://www.ti.com/lit/ds/symlink/dlpc3430.pdf

    The DLP3430 datasheet has been updated and DLPC3433 datasheet is due for revision.

    The data throughput on DSI interface can support 720P @120 Hz only in 16 bit data format. 

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Intellectual 370 points

    Hi Vivek,

    It's the board with DLPC3433, DLPA2000 and DLP3010 that we built by ourselves. 

    Yes, we are using DSI interface. It works well at 60Hz frame rate. 

    But, for some reasons, we'd like to have higher frame rate so I selected 120Hz.  

    1. For your reply, I'll try 120Hz with lower color depth.

    May I know what is the 16-bit data format? (16-bit RGB565, 16-bit YCbCr565 or both?)

    Do I know to change any setting for DLPC3433?

    2. Can Parallel interface keep 24bit data format at 120Hz input frame rate?

    3. I also saw 240Hz input frame rate at DLPC3430 spec.

        Can DLPC3422 work at 240Hz input frame rate and DSI interface? 

        What is the color data format?

    4. Is there a black insertion function?

        If so, does it disable LED during black insertion?

        And, does it black insertion for any selected color cycle?

    BR,

    Wilbur.  

  • 0 in reply to CHIA WEI YU
    TI__Mastermind 22830 points

    Hello Wilbur,

    You wrote :

    1. For your reply, I'll try 120Hz with lower color depth.

    May I know what is the 16-bit data format? (16-bit RGB565, 16-bit YCbCr565 or both?)

    TI response

    The supported formats are:

    16-bit RGB565 or 16-bit YCrCb565 on a 16 data wire interface

    16-bit YCrCb 4:2:2 (standard sampling assumed to be Y0Cb0, Y1Cr0, Y2Cb2, Y3Cr2, Y4Cb4, Y5Cr4, …

    There is known defect in firmware, it does not work at 120 Hz frame over DSI for this format. We plan to fix this bug in the next firmware release. This limitation is documented in "DLPC3433 and DLPC3438 firmware v 7.4.2 release notes".

    You wrote - 

    2. Can Parallel interface keep 24bit data format at 120Hz input frame rate?

    TI response - Yes

    You wrote -

    3. I also saw 240Hz input frame rate at DLPC3430 spec.

        Can DLPC3422 work at 240Hz input frame rate and DSI interface? 

        What is the color data format?

    TI Response - 

    DLPC3432 can support 240Hz frame rate on DLP230GP DMD through parallel interface. The DSI is bandwidth limited and max possible frame rate on DSI will ~120 Hz from 24 bit data format and ~180 Hz for 16 bit data format. For 16-bit , yo uneed to use same format.

    You wrote -

    4. Is there a black insertion function?

        If so, does it disable LED during black insertion?

        And, does it black insertion for any selected color cycle?

     TI response -

     I assume "black insertion" , you mean no display or dark screen for a specific time within  a frame and it is repeated ( same dark time and same place) for every frame.

    DLP technology supported this feature through DMD sequence. The DMD sequence defines the PWM used to create an image by  series of DMD mirror switching on along with LED. As a part of this sequence , we  can insert dark in the sequence on a specific location.   It is not tied to any color cycle , in fact it time taken from the over all frame time. The RGB color cycle are display in the remaining frame time. We are able to do this due fast switching time of DMD.

    This will require a custom firmware with dark time sequence from TI. I will request my local colleagues to reach out to you and address this need.

    the LED is switched during dark time.

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Intellectual 370 points

    Hi Vivek,

    1. There is known defect in firmware, it does not work at 120 Hz frame over DSI for this format. We plan to fix this bug in the next firmware release. This limitation is documented in "DLPC3433 and DLPC3438 firmware v 7.4.2 release notes".

    -> Could you provide the link of "DLPC3433 and DLPC3438 firmware v 7.4.2 release notes"? I didn't find it out on TI's website.

         And, may I know the schedule of the plan? 

    2. I assume "black insertion" , you mean no display or dark screen for a specific time within  a frame and it is repeated ( same dark time and same place) for every frame.

    DLP technology supported this feature through DMD sequence. The DMD sequence defines the PWM used to create an image by  series of DMD mirror switching on along with LED. As a part of this sequence , we  can insert dark in the sequence on a specific location.   It is not tied to any color cycle , in fact it time taken from the over all frame time. The RGB color cycle are display in the remaining frame time. We are able to do this due fast switching time of DMD.

    This will require a custom firmware with dark time sequence from TI. I will request my local colleagues to reach out to you and address this need.

    the LED is switched during dark time.

    -> I check with Tony Lee, my TI FAE in Taiwan. The dark time only works between the left eye and the right eye at 120Hz 3D mode. The maximum dark time is 2000us. Is it correct? 

    Actually, I'd like to use the black insertion to solve color breakup (or motion blur) Does DLP support this feature?

    BR,

    Wilbur. 

  • 0 in reply to CHIA WEI YU
    Intellectual 370 points

    Hi Vivek,

    Waiting for your reply for the last message. 

    Add one more question.

    For 120Hz 3D mode over DSI interface, it should be 16-bit YCrCb 4:2:2 (standard sampling assumed to be Y0Cb0, Y1Cr0, Y2Cb2, Y3Cr2, Y4Cb4, Y5Cr4, …

    I checked EDID setting and didn't find out setting for 16-bit & YCrCb 4:2:2.

    Do you know how to set  the EDID for 16-bit & YCrCb 4:2:2?

    BR,

    Wilbur. 

  • 0 in reply to CHIA WEI YU
    Intellectual 370 points

    Hi Vivek,

    any updated?

    BR,

    Wilbur.

  • 0 in reply to CHIA WEI YU
    TI__Mastermind 22830 points

    Hello Wilbur,

    Thank you for your patience. I am sorry for delay in response. It is has been very hectic last few days.

    your comments:

    -> Could you provide the link of "DLPC3433 and DLPC3438 firmware v 7.4.2 release notes"? I didn't find it out on TI's website.

         And, may I know the schedule of the plan? 

    TI response -please request your optical engine provide for the release notes. You may also contact local support for this information. Currently, we don't have a scheduled date for next release. 

    your comments:

    -> I check with Tony Lee, my TI FAE in Taiwan. The dark time only works between the left eye and the right eye at 120Hz 3D mode. The maximum dark time is 2000us. Is it correct? 

    Actually, I'd like to use the black insertion to solve color breakup (or motion blur) Does DLP support this feature?

    TI response - I don't suggest using the dark time between 3D sequence for this application.  It will be asymmetric ie not same between two consecutive frames. As mentioned before , firmware with dark time  is custom version of sequence. Please request your optical engine/wave guide provider to give firmware with dark time sequence.

    Your comment:

    For 120Hz 3D mode over DSI interface, it should be 16-bit YCrCb 4:2:2 (standard sampling assumed to be Y0Cb0, Y1Cr0, Y2Cb2, Y3Cr2, Y4Cb4, Y5Cr4, …

    I checked EDID setting and didn't find out setting for 16-bit & YCrCb 4:2:2.

    Do you know how to set  the EDID for 16-bit & YCrCb 4:2:2?

    Response - Please refer to section 5.1.3.3 "Write External Video Source Format Select (07h)"  of DLP3430 programmer guide on page # 15. It has details about selecting source format.

    https://www.ti.com/lit/ug/dlpu020c/dlpu020c.pdf

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    TI__Mastermind 22830 points

    Hello Wilbur,

    I few additional information to my previous response and would like to update:

    1. Release note -  The release note for DLPC3433/8 Firmware v7.4.2 " also available at firmware selector tool. 

    http://software-dl.ti.com/dlp/pico-fw-selector/

    After you select the firmware configuration. It will list the relase notes.

    http://software-dl.ti.com/dlp/pico-fw-selector/release_notes/FWSel_DLPC3433_DLPA2000_pm1_i2c0x36_v7p4p2.html

    2. Instruction for DSI - The DLPC343X programmers guide is currently under revision. The new version has details about programming DSI.  I will email you the draft version (through local office).

    Please let us know if you any additional questions.

    regards,

    Vivek