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The script below will give the width of the screen in meters by touching anywhere on the visible face, given that the prim is a box with zero rotation and attached at one of the corner HUD attachment points.

//Find Screen Width
//By Darwin Recreant

    touch_start(integer total_number)
        vector scale       = llGetScale();
        vector off_point   = llGetLocalPos();
        vector face_pos    = llDetectedTouchST(0);
        vector screen_pos  = llDetectedTouchPos(0);
        float screen_width = ((face_pos.x - .5) * scale.y - off_point.y + screen_pos.y) * 2;