Comment by schlarpc

I have a similar display, and also use blue noise dithering. Mine is driven in the backend by a web browser, which means I was able to abuse CSS and mix-blend-mode to do the dithering for me:

  ha-card::after {
    content: "";
    background-image: url(/local/visionect-dither.png);
    background-repeat: repeat;
    position: absolute;
    height: 100%;
    width: 100%;
    display: block;
    mix-blend-mode: multiply;
  }

The dithering texture used is 128_128/LDR_LLL1_10.png from https://github.com/Calinou/free-blue-noise-textures