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DLP3010EVM-LC: Difference in display of splash pattern

user6036569
Intellectual 505 points
Part Number: DLP3010EVM-LC

Hello
I'm Tak

We are still evaluating the DLP3010EVM-LC.


The question is the difference between the splash pattern save format and the screen mode
The display is different.

As a result, except for the combination of ScreenMode_16-bit and YCbCr 422
It was a mysterious display.

With the registered splash pattern data
For the following four outputs
I attached the captured image.


Registration data:
0.Splash_glayscale_ORG

Each display content

1.PatternMode_16-bit RGB 5-6-5

2.PatternMode_16-bit YCbCr 422

3.ScreenMode_16-bit RGB 5-6-5

4.ScreenMode_16-bit YCbCr 422

I want to use "2.PatternMode_16-bit YCbCr 422".
However, it is not the expected display of 8bit scale.
why?

Could you also explain each display content?

Thank you.

  • 0
    TI__Genius 9971 points

    Hello Tak,

    Welcome to DLP forum and thank you for your interest in DLP technology.

    The splash patterns are stored in one of 16 bit formats - either RBG565 or YCbCr 422. You can figure out the storage format using of the particular splash image using  "Read Splash Screen Header (0Fh)" command.

    Kindly refer to the software programmers guide for more info regarding the same - http://www.ti.com/lit/ug/dlpu075a/dlpu075a.pdf

    Please let me know if you have any additional queries.

    Thanks and regards,

    Mayank

  • 0 in reply to Mayank Khandelwal
    Intellectual 505 points

    Hello
    Mayank

    Thank you for your reply.

    I already know what you are answering,
    Unfortunately it's not my solution.

    First of all, at least
    "2.PatternMode_16-bit YCbCr 422"
    I cannot understand the difference in the gradation results of "4.ScreenMode_16-bit YCbCr 422".

    Why doesn't "2.PatternMode_16-bit YCbCr 422" display on an 8-bit scale?
    Could you actually try it and confirm?

    I have an 8bit scale display with "2.PatternMode_16-bit YCbCr 422"
    I believe in success.

    Mayank answered my question
    I believe in solving it.
    Thank you.

    Tak

  • 0 in reply to user6036569
    TI__Genius 9971 points

    Tak,

    I will let you know my findings very soon. 

    Thank you for your patience.

    Regards,

    Mayank

  • 0 in reply to Mayank Khandelwal
    Intellectual 505 points

    Mayank,

    Thank you for your investigation.

    Wait for the result.

    Tak

  • 0 in reply to user6036569
    TI__Genius 9971 points

    Tak,

    Kindly explain to me in which mode are you trying to display the patterns - 16 bit formats are not supported in any of the light control modes of this chipset.?

    I am assuming that you have captured the 4 images by displaying the input image (Splash_glayscale_ORG) in the external pattern mode for the first 2 cases mode and in external video mode for the remaining 2 cases.

    Please correct me if I am wrong.

    Regards,

    Mayank

  • 0 in reply to Mayank Khandelwal
    Intellectual 505 points

    Mayank,

    The images I captured are as follows.
    External mode is not used..

    1.PatternMode_16-bit RGB 5-6-5
    2.PatternMode_16-bitYCbCr 422
    →Light Control . Splash Pattern Mode

    3.ScreenMode_16-bit RGB 5-6-5
    4.ScreenMode_16-bit YCbCr 422
    →Display - Splash Screen Mode


    I splash-registered "Splash_glayscale_ORG"
    I made the following settings.


    I think the result will be the following image.


    However, if you capture "1.PatternMode_16-bit RGB 5-6-5" or
    The result is "2.PatternMode_16-bit YCbCr 422".

    Either way, it's not ideal.

    I believe in you
    Will you check again and solve?

    Regards,

    Tak

  • 0 in reply to user6036569
    TI__Genius 9971 points

    Tak,

    Thanks for the detailed description of your test case. I am currently looking into this query and will get back to you within a couple of days.

    Thanks and regards,

    Mayank

  • 0 in reply to Mayank Khandelwal
    Intellectual 505 points

    Mayank,

    Wait for the result.

    Thanks and regards,

    Tak

  • 0 in reply to user6036569
    TI__Genius 9971 points

    Tak,

    The input image that you are using "Splash_glayscale_ORG" is a RGB888 PNG image. 

    All the Splash images are stored in the flash memory in a 16 bit format.

    When displaying these images in Splash Screen mode, the system automatically initializes the system color processing based on the splash header information prior to sending the splash image down the controller data path. However, in Light Control - Splash Pattern mode, no color processing is performed and the stored bitmap is displayed as is, irrespective of whether the image is stored in RGB565 format or YCrCb (16-bit) format. Therefore, to get an accurate representation of the input image in splash pattern mode, the images must be stored in RGB565 format in flash.

    This is the reason why you are not seeing expected output while running the Splash pattern mode.

    Regards,

    Mayank

  • 0 in reply to Mayank Khandelwal
    Intellectual 505 points

    Mayank,


    Save in RGB565 format and according to your description
    The following can now be displayed.

    Although it has a gradation of 5 bits,
    My goals have been achieved and resolved.

    Thank you so much.

    Tak