Send geberate QR code PNG to view with rendering helper view

I have a php qr code and when i am using in my controller code like this QRcode::png('PHP QR Code :)'); i can't see an image in my view but when i disable view and rendering $this->_helper->layout()->disableLayout(); $this->_helper->viewRenderer->setNoRender(true); QRcode::png('PHP QR Code :)'); i see only QR code on white page. I need someone who can help me send qr code to view. but qr code can't be write to file on server. only generate in real time. or send as base64 to view