The Dell Inspiron 640M laptop typically uses a flat, flexible cable known as the LVDS (Low-Voltage Differential Signaling) cable to connect the display panel to the motherboard. This cable is responsible for transmitting video signals from the motherboard to the display.
If you're looking for a replacement or troubleshooting information for the display cable of the Dell Inspiron 640M laptop, you can search for "Dell Inspiron 640M LVDS cable" or "Dell Inspiron 640M display ribbon cable." These terms should help you find relevant products or resources for your specific laptop model.