Display
The T400 was quite advanced for the early 2000s in terms of display technology. It boasts a TFT display with the capability to show 65K colors, which was considered vibrant compared to the monochrome displays that preceded it. The main screen offers a resolution of 128 x 144 pixels, while it also includes a second external display with a resolution of 96 x 64 pixels. This dual-display setup was particularly useful for viewing notifications or the time without needing to open the device.