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I'm not sure why you have brackets after running the command, are you sure the command you've written in the question is actually the one you try ? I can only reproduce this if I don't put the last ".

Anyways you also have something wrong in your command : rospack find robot1_description. Since you have quotations mark, every thing you type between will be treated as a string so your arg model will be as you typed but not with the actual path of your package. You need to add $ and put rospack find your_package between parentheses to tell the difference with a string.

So this command should be working (provided you have correctly sourced your package so that rospack find gives the correct path):

 roslaunch robot1_description display.launch model:="$(rospack find robot1_description)/urdf/robot1.urdf"