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Original question:

DS90UH948-Q1: LCD display flickering issue when connecting to the DSI MIPI serializer DS90UB941AS-Q1

SN65LVDS93: LVDS Display flickering problem

Balwinder Kumar
Prodigy 30 points
Part Number: SN65LVDS93

Hi,

we are using two 15.1inch display panels, one is from innolux and the other one is from highness,

we are using custom board with stm32f476 mcu with 16bit rgb to lvds interface, for rgb to lvds conversion we use sn65lvds93 chip. with this setup lcd from innolux works fine, but the lcd from highness starts to flicker.

at first i thought it is due to backlight, but the backlight voltage is stable, and also i think this problem is not due to board layout because the panel from innolux works fine with same setup.

so i am unable to find what is the actual reason,

  • 0
    TI__Expert 4160 points

    Hi Kumar,

    Just to clarify, you are using the exact same setup for two different displays including voltage supply, MCU, RGB to LVDS serdes, and configuration code. The only difference is that one display starts to flicker and the one does not?

    It sounds like the common difference between the two setups is the displays. Could you tell provide a little more information regarding the display timing? What is active resolution size of your displays? What is the hfp, hbp, hsync width, vfp, vbp, and vsync width on each of the displays? What is the image size and blanking that you are trying to send over?

    Respectfully,

    William

  • 0 in reply to William Yi
    Prodigy 30 points

    Hi,

    yes sir, we are using same setup for each dispaly

    Please check the following images for timing

    flickering display timings

    non-flickering display timings

  • 0 in reply to Balwinder Kumar
    TI__Expert 4160 points

    Hi Kumar, 

    Thank you. Could you also provide the resolution that you are trying to send? including your PCLK, frame rate, total pixel size, and active pixel size. I need that to compare to compare to the timing information of the two displays

    Respectfully,

    William

  • 0 in reply to William Yi
    Prodigy 30 points

    hi sir,

    the display resolution we are trying to send is 1024*768

    PCLK = 65MHz

    Frame rate = 60fps

    total pixel size = 1342*806

    active pixel size = 1024*768

  • 0 in reply to Balwinder Kumar
    TI__Expert 4160 points

    Hi Kumar!

    Thank you. I checked out the display timings. It looks like your display should work fine your application.

    Hmm, what happens when you swap the displays? Does the issue follow the displays or the ports?

    Do you have another board? We can check to see if it is board specific issue?

    Do you have different kinds of cable? Sometimes these high speed cables may be susceptible to break. May also need to try out with different lengths of these cables. 

    These are just some variables to help us narrow down this issue.

    Respectfully,

    William