Is there any way to close the LCD programmatically?

[yinxiang]

Here's my code, I intended to turn off the LCD programmatically, but they are 
not working

        Err err = SysLibLoad( kHWUtilsType, kHWUtilsCreator, &HWURef  );
        if ( err == 0 )
         {
            loaded = true;      
        }
        HWUOpen( HWURef );
        Err err = HWUEnableDisplay( HWURef, false );
        HWUClose( HWURef );
        if ( loaded )
        {
           SysLibRemove( HWURef );
        }

Can somebody help me out?

Thanks in advance.
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