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DS90UB941AS-Q1: 941 Asymmetric Splitting function

Kailyn Chen
Genius 9560 points
Part Number: DS90UB941AS-Q1

Hello,

Customer use 941AS Asymmetric Splitting mode to light two LCDs  simultaneously. He has read the snla308a.pdf file, but there is come confusion about it, does Asymmetric Splitting mode have timing requirement for the two LCDs?

For example, LCD1 resolution is 1920*720. LCD2 resolution is 1268*360.

lcd1 and lcd2 satisfy below conditions;

1. Before DS90UB941, Soc need to fill LCD2 with Htotal and Vtotal to keep the same with LCD1.

2. After split and crop, the blank of LCD2 is filled section+ blank itself , that is to say, the crop content enter the blank aera.

Please help to check if two LCDs could satisfy Asymmetric Splitting function, if there is tool to calculate the timing of  aggregation?

Best regards

Kailyn 

  • 0
    TI__Expert 4160 points

    Dear Kailyn,

    Thank you for the question!

    I have taken a look at the information you have provided. In regards to timing, the superframe must include two identical size images. To do this, the extra pixels are put into the blanking of the smaller displays.

    Your LCD1 has a htotal of 2010 and vtotal of 760. 
    LCD2 has a maximum htotal of 3018 and a maximum vtotal of 860. This would enough to cover the image size and satisfy the timing requirements!

    Best Regards,

    William Yi

  • 0
    Prodigy 30 points

    hi,William:

        Is it only necessary that vtotal,htotal is larger than the maximum resolution screen? Is there any requirement for hfp hbp hsync，vfp,vsync,vbp? The new hfp ,vbp after cropping should be within the scope of the specification,  is right?

  • 0 in reply to user5279301
    TI__Expert 4160 points

    Dear Kailyn,

    That is correct. There are no requirements for 941AS that require these specific tolerances. As long as the smaller panel can tolerate large amounts of vertical and horizontal blanking. Cropped lines from the superframe will turn into blanking lines for the smaller image so the panel needs to have a tolerance for blanking for this to work.

    Please keep in mind that the 941AS has a minimum PCLK frequency of 25MHz per port, so you will also need to ensure that both panels can use >= 25MHz PCLK.

    Also, whatever PCLK you use for the superframe image, it will be cut in half for each output image. Let’s say for example that you have two screens each with PCLK = 75MHz, then for your superframe image you would use 150MHz.

    Very Respectfully,

    William Yi