- The aspect ratio of the Lenovo ThinkPad T400 is the ratio of the width of its display area to its height. This is represented as two numbers separated by a colon. For most of the 2000s, the standard aspect ratio for computer displays was 16:10. By 2010, however, 16:9 replaced 16:10 as the most popular aspect ratio.
- Since it was released in 2008, the Lenovo ThinkPad T400 has an aspect ratio of 16:10. This fractional relation is paired with two choices of graphic display resolution, which represents the width and height dimensions of a display in pixels. Customers could choose between 1,280-by-800 pixels and the superior 1,440-by-900 pixels. Both resolution choices, however, use the Wide eXtended Graphics Array (WXGA) standard.
- Using a screen that measures 14.1 inches diagonally, the Lenovo ThinkPad T400 with the 1,280-by-800-pixel resolution has a density of 98 dots per inch, while the 1,440-by-900-pixel resolution surpasses it with 129 dpi. Also, the laptop with 1,440 by 900 pixels has a light-emitting diode backlight that provides a luminance no less than 200 candelas per square meter. This surpasses the 1,280-by-800-pixel resolution-featuring version, which has a minimum luminance of 185 cd/m2.
- Mainly based on the Microsoft Windows Vista operating system, the T400 was, at the time, one of the more advanced offerings from Lenovo's ThinkPad brand. In addition to the display screen choices, the T400 came with a Intel Core 2 Duo processor with up to 2.8 gigahertz of processing speed, a maximum system memory expandability of 8 gigabytes, up to 320 gigabytes of hard drive space or the choice of a 64 gigabytes solid-state drive, a one-gigabit Ethernet connection for wired networking, Wi-Fi card and Bluetooth 2.1 technology for wireless networking, and CD and DVD burner.
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