The Toshiba Satellite L840 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 Toshiba L840 laptop, you can search for "Toshiba L840 LVDS cable" or "Toshiba L840 display ribbon cable". These terms should help you find relevant products or resources for your specific laptop model.