What is the expected growth rate of the investments made in the last few years in terms of extend capital 
ing it out. The way the supply chain works is we will literally provide that part -- that cover part.
So both the underlying structure of the glass structures as well as the material we use to drive that composite had to be able to improve the optics and durability of those cameras. So we've built the supply chain to be able to have that rural end to really the same plants that ultimately glass parts go to build phones. So we feel pretty good that we have the capability and we've built the capability to serve the market. And so now it will be how quickly will the technology be adopted because it is new.
It is a new feature for phones. It does improve camera performance pretty darn significantly. So we're hoping that that becomes pretty rapidly adopted. One thing that's going to impact pacing though is when you change the light -- the capturing capabilities of a camera.
Remember that cameras are pretty complex devices, right? So you have the whole lens system and you have different chipsets to deal with that imaging and they're built around an optical chain. That is a certain amount of light that's available. So we're actually improving that. And so as you improve that to take full advantage of it, you probably need to optimize some other component so.
So we do think that though it is relatively easy and optimal, there are things that you would need to do differently to take full advantage of this to deliver an advantage and customer experience.
Martin Yang -- Oppenheimer & Co. Inc.-- Analyst
That's really helpful. Thank you.
Ann Nicholson -- Vice President of Investor Relations
Next question?
Operator
Comes from Shannon Cross with Cross Research. Your line is open.
Shannon Cross -- Cross Research LLC -- Analyst
Thank you very much. I have a big-picture question. During the script you noted build projects you've undertaken from 2016 to 2019 have an ROIC of over 20% and your kind of this is my work but in a harvesting mode on some of those. How should we think about the cases of the investments you've made over the last few years? Just in terms of thinking about how you maintain sort of the continued benefit from -- I don't know where you're investing in so that in four years you can say that the ones you've done right now are yielding sort of a similar growth rate? I'm just trying to understand the building blocks that get us to the future strong revenue growth, given what you've done in the past four years.
Thank you.
Tony Tripeny -- Executive Vice President and Chief Financial Officer
So yeah, sure, Shannon. That's a great question. I mean the first thing I would say is as our focus right now is on what we call our extended capital, and that extend capital is you know how we continue to grow in our businesses. And a lot of the growth that we're experiencing right now really comes from the investments we've made the last couple of years from the extend capital in addition to the build capital and we'd expect that -- we've got a lot of extend capital that we're putting in place right now, and that's going to continue to support our growth going forward.
Given our More Corning trends and our innovation model and the opportunities that we see out there that really gives us a chance to perform much better than the underlying market, I'm sure at some point we will be back at looking at build capital and when we do that you know we'll do that with real customer commitments, including financing. So we think this is a great model to run our business with. It's really improved our capital efficiencies, it's improved our return on invested capital and I think from a shareholder standpoint, this is a great way to run our businesses.
Shannon Cross -- Cross Research LLC -- Analyst
Great. Thank you.
Ann Nicholson -- Vice President of Investor Relations
Let's take one more question before we close.
Operator
OK. And that comes from Meta Marshall with Morgan Stanley. Your line is open.
Meta Marshall -- Morgan Stanley -- Analyst
Great. Thanks. Just maybe following up on the last question. Wendell, you guys mentioned kind of supply constra
ing it out. The way the supply chain works is we will literally provide that part -- that cover part.
So both the underlying structure of the glass structures as well as the material we use to drive that composite had to be able to improve the optics and durability of those cameras. So we've built the supply chain to be able to have that rural end to really the same plants that ultimately glass parts go to build phones. So we feel pretty good that we have the capability and we've built the capability to serve the market. And so now it will be how quickly will the technology be adopted because it is new.
It is a new feature for phones. It does improve camera performance pretty darn significantly. So we're hoping that that becomes pretty rapidly adopted. One thing that's going to impact pacing though is when you change the light -- the capturing capabilities of a camera.
Remember that cameras are pretty complex devices, right? So you have the whole lens system and you have different chipsets to deal with that imaging and they're built around an optical chain. That is a certain amount of light that's available. So we're actually improving that. And so as you improve that to take full advantage of it, you probably need to optimize some other component so.
So we do think that though it is relatively easy and optimal, there are things that you would need to do differently to take full advantage of this to deliver an advantage and customer experience.
Martin Yang -- Oppenheimer & Co. Inc.-- Analyst
That's really helpful. Thank you.
Ann Nicholson -- Vice President of Investor Relations
Next question?
Operator
Comes from Shannon Cross with Cross Research. Your line is open.
Shannon Cross -- Cross Research LLC -- Analyst
Thank you very much. I have a big-picture question. During the script you noted build projects you've undertaken from 2016 to 2019 have an ROIC of over 20% and your kind of this is my work but in a harvesting mode on some of those. How should we think about the cases of the investments you've made over the last few years? Just in terms of thinking about how you maintain sort of the continued benefit from -- I don't know where you're investing in so that in four years you can say that the ones you've done right now are yielding sort of a similar growth rate? I'm just trying to understand the building blocks that get us to the future strong revenue growth, given what you've done in the past four years.
Thank you.
 Tony Tripeny -- Executive Vice President and Chief Financial Officer
So yeah, sure, Shannon. That's a great question. I mean the first thing I would say is as our focus right now is on what we call our extended capital, and that extend capital is you know how we continue to grow in our businesses. And a lot of the growth that we're experiencing right now really comes from the investments we've made the last couple of years from the extend capital in addition to the build capital and we'd expect that -- we've got a lot of extend capital that we're putting in place right now, and that's going to continue to support our growth going forward.
Given our More Corning trends and our innovation model and the opportunities that we see out there that really gives us a chance to perform much better than the underlying market, I'm sure at some point we will be back at looking at build capital and when we do that you know we'll do that with real customer commitments, including financing. So we think this is a great model to run our business with. It's really improved our capital efficiencies, it's improved our return on invested capital and I think from a shareholder standpoint, this is a great way to run our businesses.
Shannon Cross -- Cross Research LLC -- Analyst
Great. Thank you.
Ann Nicholson -- Vice President of Investor Relations
Let's take one more question before we close.
Operator
OK. And that comes from Meta Marshall with Morgan Stanley. Your line is open.
Meta Marshall -- Morgan Stanley -- Analyst
Great. Thanks. Just maybe following up on the last question. Wendell, you guys mentioned kind of supply constra