Based on this Windows 7 answer which links to this script page, and checking this MSDN library page, that the codes used are correct you can run the powershell script below to switch the screen off. I ran it on my Windows 10 laptop and it worked fine. Moving the mouse after running the script wakes up the screen like you normally do when the screen has turned off from the power save feature.
The 2 second delay before it turns off the screen is so that you can have time to let go of the mouse/keyboard before Windows starts checking for movement for turning the screen back on.
Using this powershell script, you do not need any third party tool or need to mess with your existing settings. Just save it in a file with a .ps1 file extension and run it with powershell.
# Turn display off by calling WindowsAPI.
# SendMessage(HWND_BROADCAST,WM_SYSCOMMAND, SC_MONITORPOWER, POWER_OFF)
# HWND_BROADCAST 0xffff
# WM_SYSCOMMAND 0x0112
# SC_MONITORPOWER 0xf170
# POWER_OFF 0x0002
Add-Type -TypeDefinition '
using System;
using System.Runtime.InteropServices;
namespace Utilities {
public static class Display
{
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(
IntPtr hWnd,
UInt32 Msg,
IntPtr wParam,
IntPtr lParam
);
public static void PowerOff ()
{
SendMessage(
(IntPtr)0xffff, // HWND_BROADCAST
0x0112, // WM_SYSCOMMAND
(IntPtr)0xf170, // SC_MONITORPOWER
(IntPtr)0x0002 // POWER_OFF
);
}
}
}
'
start-sleep 2
[Utilities.Display]::PowerOff()
