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Operator
Good day, everyone. And welcome to the Synaptics Forth Quarter 2015 Conference Call. Today's conference is being recorded. At this time, I would like to turn the conference over to Mr. Alex Wellins from Blueshirt Group. Please go ahead, sir.
Alex Wellins - Director
Good afternoon. Thank you for joining us today on Synaptics For Quarter and Fiscal 2015 Conference Call. This call is also being broadcast live over the web, and can be accessed from the Investor Relations section of the Company's web site at www.Synaptics.com.
With me on today's call are Rick Bergman, President and CEO, and Wajid Ali, the Company's Chief Financial Officer. In addition to the Company's GAAP results, management will provide supplementary results on a non-GAAP, which excludes share-based compensation charges and certain non-cash or non-recurring items. Please refer to the press release issued after market close today for detailed reconciliation of GAAP and non-GAAP results.
Additionally, we'd like to remind you that during the course of this conference call, Synaptics will make forward-looking statements. Forward-looking statements give our current expectations and projections related to our financial condition, results of operations, plans, objectives, future performance and business. Although Synaptics believes our estimate and assumptions to be reasonable, they are subject to a number of risks and uncertainties beyond our control and may prove to be inaccurate. Synaptics cautions that actual results may differ materially from any future performance suggested in the Company's forward-looking statements.
We refer you to the Company's current and periodic reports file with the SEC, including the Synaptics form 10-K for the fiscal year ended June 30th, 2014, for important risk factors that could cause actual results to differ materially from those contained in any forward-looking statements. Synaptics expressly disclaims any obligation to update this forward-looking information. With that said, I'll turn the call over to Rick Bergman. Rick?
Rick Bergman - President, CEO
Thanks, Alex. I'd like to welcome everyone to today's call. I'm really excited today to reflect back on fiscal 2015, the year that Synaptics crossed the $1 billion annual revenue threshold. Capped off by another strong fourth quarter, annual revenue reached a record $1.7 billion, representing unprecedented growth of 80% from the prior year and exceeding our 75% growth target.
Non-GAAP net income for the year was also a record $221.4 million or $5.69 per share, up 34% over fiscal 2014. We continued our commitment to generating shareholder value during the year by purchasing close to 5% of our shares outstanding. In fact, from the quarter I joined Synaptics nearly four years ago, we have purchased $300 million worth of stock or close to 7.5 million shares. I am pleased to report that our Board of Directors has increased and extended the authorization repurchases by $120 million, for a total current authorization of $198 million available through July 2017.
During fiscal 2015, we achieved a new milestone, cumulatively shipping over 3 billion units of Synaptics product solutions into the markets we serve, just 13 months after hitting the $2 billion threshold. We more than doubled the contribution from China-based mobile customers, as well as doubled revenue from our fingerprint I.D. business. In addition, we successfully completed and integrated the acquisition of our display driver business, strengthened our competitive position, and accelerating our road map for touch and display driver integration.
While the addition of our biometrics and display driver divisions helped fuel our performance over the past couple of years, we intend to remain a growth company. We continue to invest heavily in R&D to ensure that our new platforms reach their full potential and to pave the way for future revenue opportunities in areas such as automotive. With our continued commitment to growth and innovation, we expect to generate strong top line growth in fiscal 2016 of 20% to 25% and to reach the next major step in Synaptics evolution by becoming a $2 billion revenue company.
I will now provide an update on our core markets, then Wajid will review our fourth quarter results in more detail and provide our current outlook before opening up the call to your questions. Adoption of biometric technologies for smartphones, tablets, notebooks and PC peripherals is being driven by growth in secure mobile transactions and password burdens.
We believe the momentum for these solutions will continue to proliferate from OEM flagship products to mid to lower end models. We're proud to be sampling our new match and sensor fingerprint authentication technology, the industry's first fully hardware encapsulated fingerprint sensor and matching solution. This functionality is literally off the grid, isolating fingerprint image enrollment, pattern storage, and biometric matching within the fingerprint sensor to provide ultimate protection against on-device threats.
Matching sensor includes a victim on system on chip or SOC architecture, and which a single device performs both input/output functions with an in sensor microprocessor executing firm ware by performing security sensitive functions completely inside the SOC, matching sensor at the new level security and privacy due to total isolation from host operating system. We're happy to announce that these products are officially FIDO certified. There are a couple of notable fingerprint ID design wins I'd like to mention.
We're pleased to announce that Samsung has chosen our area touch fingerprint sensor for its new Galaxy A8 Smartphone, as well as the Galaxy tab S2 tablet, where we also provided the touch solution. We're also excited that Sharp selected our swipe fingerprint I.D. solution for its latest flagship smartphone, the Aquos Zeta SH-03
The Zeta is part of NTT DoCoMo's recent mobile payment service launch in the leadership initiative to offer password list access to their suite of online services. In another industry first, Synaptics fingerprint solution for the desktop PC mouse was widely showcased at Computex. Key peripheral makers, including Razer, Logitech, Lite On, Thermaltake, Solid Year and EBGA demonstrated this solution.
This unique and secure authentication from iZen Keyboards enables OEM to (inaudible) to deliver new and differentiated products in a highly competitive desktop PC market. Synaptics is meeting an emerging desktop PC ecosystem demand for easy and secure authentication, driven by factors such as the security requirements defined by Windows 10 biometric integration. Also at Computex, we announced the availability and demonstrations of our new SmartBar technology, which further expands Synaptics' portfolio of innovative solutions into the untapped desktop PC market.
Designed specifically for desktop PCs and notebooks our capacitive sensing SmartBar technology is first to market solution that adds unique touch gesture features to the keyboard space bar, providing OEMs with the ability to create and deploy products that enhance productivity and usability for consumers.
From our Smart display division, on top of the Samsung Galaxy Tab S2 mentioned earlier, we also announced that Xiaomi selected our touchscreen solution to power their latest flagship smartphones. This deployment demonstrates our continued momentum in the Chinese market. Xiaomi is one of the world's largest mobile manufacturers, and has adopted our ClearPad family of capacitive touchscreen solutions for its Mi Note and Note Pro Smartphones. In China we're seeing broad interest in high-end to low-end smartphone manufacturers.
On the high end OEMs are adapting Synaptics on-sale touch solution with ammo led including the Gionee E8, HTC One, E9 plus dual SIM, Meizu MX-5, Oppo R7 and the Vivo X5 Pro smartphones. While expanding penetration of in-cell shipments to the high-end market, Synaptics is also engaged with more Chinese customers choosing our upgraded slim solutions serving the lower-end China market.
Tier 1 OEMs are also in the process of designing in our [four] sensing capabilities into their upcoming high-end smartphones. There is strong interest in Synaptics differentiating Force technology feature that is expected to enable new modes of human interface. In newer markets we're beginning to see traction across our products in automotive.
We're also seeing growing demand for our discreet touch solutions in wearable products and recently announced that a Huawei selected our touchscreen solution for its stylish smartwatch. We're also pleased to have penetrated the education tablet market with major OEMs selecting our touch controller solutions for tablets, specifically, for the global education needs.
Spotlighting our strategic acquisition less than one year ago, our Japan design center has already delivered on four new display driver integrated circuit, or DDIC solutions, including the industry's first DDIC supporting ultra-HD resolution. These new feature-rich products add to the Company's industry-leading portfolio of DDICs, supporting global OEM's breadth of smartphones and tablets ranging from flagship products to mid to low-end models.
Synaptics' full DDIC lineup provides comprehensive support for panel resolutions, ranging from HD, full HD, wide quad HD to ultra HD. These latest solutions feature the industry's smallest chip size with lowest power and fewest required external components due to the single chip design, all while providing the absolute highest image quality.
Lastly, we're thrilled to now be sampling our ClearPad 4300 TDDI solution to industry-leading OEMs and LCMs. ClearPad 4300 is our second generation TDDI product targeting smartphones and tablets. This new single chip solution is the first to combine Synaptics best in touch controller IP. and the systems level expertise with RSPs proven display driver technology. Our OEM and LCM customers demand premium quality, product differentiation and feature rich TDDI solutions.
ClearPad 4300 uniquely positions Synaptics to take advantage of new growth opportunities in the global smartphone and tablet markets, and we remain on track to make our first production shipments within this calendar year. As we did last year, we're planning to host another Analyst and Investor Day at our headquarters in November of this year. We'll provide more question details at a later date.
While that's our main forum for updating data on our share across market, let me share how we are thinking about growth opportunities for the new fiscal year. As you are aware, we continue to see moderating growth rates in our more traditional markets, with PCs on a slightly downward trajectory, smartphones now trending towards a sing digit range and limited upside and tablets and large touchscreens. However, these remain important components of our revenue based on strong footprints, with room for further expansion.
Whether it be with new fingerprint-enabled solutions for notebooks and desktops, the continued penetration of the smartphone and tablet market in China, new form factors incorporating ForceTouch or the broadening of our display driver customer base. Beyond our leadership position in revenue opportunities within these core markets, we're capitalizing on two very strong growth pillars with our TDDI and biometric solutions.
We continue to see extremely strong demand for TDDI products in and are investing as fast as we can to accommodate OEM's desire for thinner, more optimized and cost-effective solutions. The appetite for fingerprint I.D. solutions also continues to be very strong. Our earlier resources were dedicated to developing the industry's most robust area touch sensor, featured in the in the premium design wins. On the heels of that success we're well positioned to broaden our customer reach, and we continue to secure additional design winds that will launch over 2016.
Lastly, we continue to invest in previously untapped areas such as auto, as well as evolving consumer device categories like wearables. As always, our markets remain dynamic, which can lead to seasonal swings in quarterly fluctuations in our results. As in the last few years, we're coming off a very strong Q4, making for a tough sequential compare. Albeit, less pronounced than in the past, due to a more diverse product portfolio.
On the whole, we're pleased to be forecasting another year of robust profitable growth, with a very strong pipeline of design wins that will help drive strong upside in the second half of the year, as we March towards becoming a multi-billion dollar annual revenue company. As we close out the year, I'd like to thank our employees around the globe for their unwavering dedication and support, culminating in a truly phenomenal year for the Company. I'm now pleased to officially introduce our new CFO, Wajid Ali, who will review our financial results.
We're very excited to have him on board. He joins us after working with several sizable public semi conductor companies where he was instrumental in helping to scale large business units. Wajid brings a renewed focus and discipline to the operating model, and we're already benefiting from his expertise and point of view. Many of you will have the opportunity to get to know him at various upcoming investor-oriented events. With that I'll now turn it over to Wajid.
Wajid Ali - SVP, CFO
Thanks, Rick, for that very kind introduction. It's incredibly exciting to join an industry leader and innovative growth company that's benefited from a consistently performing financial model. I'm very happy to be part of the team. And I also look forward to getting to know our investors and analysts over the coming months.
As Rick mentioned, we are extremely pleased with our top-line results, as revenue for both the quarter and fiscal year ended. June 2015, represented record quarter and annual results of $479 million and $1.7 billion, respectively. June quarter revenue increased 52% year-over-year and sequentially was up slightly, while fiscal 2015 revenue was up almost 80% from the prior year. During the quarter, we had four customers above the 10% threshold.
Our non-GAAP net income per share for the June quarter was $1.57, and non-GAAP net income per share for fiscal 2015 was a record $5.69, up 34% from last fiscal year. We achieved strong mobile revenue growth in the year-over-year quarter, while the revenue mix from mobile and PC products was approximately 89% and 11%, respectively.
Revenue from mobile products was up 76%, compared with the year-over-year quarter and up 2% sequentially. While revenue from PC products was down 27%, compared with the year-over-year quarter and down 13%, sequentially. Our strong year-over-year mobile revenue growth was driven primarily by display driver solutions, which represented approximately 50% of total revenue in the June quarter.
Non-GAAP gross margin of 38% was at the mid-point of our guidance range and primarily reflects overall product mix. Non-GAAP operating expenses were $107.2 million, up $3.9 million from the prior quarter. Contributing to the 4% increase in non-GAAP OpEx, was our continued investment in technical and customer support personnel, to expand market adoption of our product solutions, including TDDI and ongoing investments in our touch product portfolio. In addition, we saw increased legal expenses related to our recent litigation activities.
GAAP operating expenses in the June quarter were $123.2 million, which include share-based compensation of $11.9 million and net-acquisition related costs of $4.2 million, consisting of intangibles amortization and change in contingent consideration. Our non-GAAP tax rate was 17% in fiscal 2015, while our GAAP tax rate was 30%.
Fourth quarter non-GAAP net income was $61.2 million, or $1.57 per diluted share, compared with non-GAAP net income of $56.8 million or $1.46 per diluted share. Now I'll turn to our balance sheet. We ended the quarter with $400 million of cash, cash flow from operations was $210 million for the year. Employee participation in our equity incentive programs, including the associated tax benefit, provided net cash of $41 million for the year.
Further, we used $121 million to repurchase approximately 5% of our shares outstanding, similar to levels repurchased in each of the past several years. As Rick mentioned, our Board of Directors has increased and extended the authorization for stock repurchases, bringing our cumulative authorization to $850 million, of which we have used $652 million over the past decade.
Capital expenditures for the year were $52 million and depreciation was $25 million. Receivables at the end of June were $325 million and DSOs were 61 days, while inventories were $140 million and inventory turns were [8], all consistent with our expectations. Now, I will make a few comments regarding our quarterly outlook.
Based on our backlog of approximately $159 million, entering the typically back-end loaded September quarter, subsequent bookings, customer forecasts, product sell-in and sell-through timing patterns, as well as expected product mix, we anticipate revenue to be in the range of $450 million to $490 million, an increase of 59% to 73% over the prior year.
Our expected revenue range reflects strong year-over-year growth in mobile product revenue, including significant contributions from our display driver products. On a sequential basis, this outlook reflects positive trends in both our touch and fingerprint products, despite typical downward seasonality, offset by product cycle trends in display driver products.
We expect the revenue mix from mobile and PC products to be roughly similar to the proceeding quarter. Taking into account our overall revenue mix, we expect non-GAAP gross margins for the September quarter to be approximately 37% to 39%. We expect non-GAAP operating expenses in the September quarter to moderately increase from the June quarter, reflecting continued investments in TDDI product development, as well as incremental legal expenses.
We anticipate the FAS 123(R) charge in the first quarter to be in the range of $12 million to $12.5 million. GAAP expenses will also include none cash charges of approximately $19 million related to intangibles amortization, of which approximately $14 million will be reflected in cost of sales. We anticipate our non-GAAP, long-term cash-based tax rate for fiscal 2016 to remain in the range of 16% to 18%. Non-GAAP net income per diluted share for the September quarter is anticipated to be in the range of $1.30 to $1.60 per share.
As we move through the year, we expect our business to reflect year-over-year growth, including expanding momentum for our fingerprint I.D. and TDDI product solutions. As Rick mentioned, for fiscal 2016, we expect revenue growth of 20% to 25%. In closing, we are extremely pleased with our record financial performance in fiscal 2015, and believe we are well positioned to achieve record first-quarter revenue and record non-GAAP net income to kick off physical 2016.
We believe we continue to be very well poised to capitalize on the opportunities in front of us. With that we will now turn the call over to the operator to start the Q&A session. Operator, over to you.
Operator
Thank you, gentlemen.
Operator
(Operator Instructions).
Operator
And our first question will come from Paul Coster of JPMorgan.
Paul Coster - Analyst
Yes. Thank you very much for taking my questions. I've got really two. The first one is you talk of the fiscal year 2016 being back-end loaded and also got the (inaudible) rate, but it's going to be primarily focused on TDDI, judging by your extreme -- your extremely statement. Can you confirm that? And related to that, whether, you know, we should fear this being very broad-based adoption or is it really concentrated in handful of customers?
Rick Bergman - President, CEO
Okay. Thank you, Paul, for the question. So maybe I'll try to clarify where we see opportunities, is what you're getting at, as we move through the fiscal year. In a couple of product areas, we've been investing in and will continue to heavily in development, because we see the growth prospects being quite strong, and that's in our biometric or fingerprint area. And then secondly, as you mentioned, in TDDI. Those are continue to be our two pillars of growth. As we go through the course of the year, we expect those to start handling the load of the growth as well. Frankly, we also continue to see the opportunities to continue to grow the DDIC business. Now, there's seasonality and other things there that can impact that in certain customer ramps.
Overall, even with the growth of TDDI, we kind of see that as another opportunity. And there's obviously trade-off between the DDIC and the TDDI. In terms of our customer base, we're pretty broadly deployed across the customer base as is. And we would expect that to continue. During my prepared remarks, you heard me rattle off a number of the growing China OEMs. And our success there continues to grow substantially with some great sequential, as well, year-over-year growth that we've had with those customers. So the short answer there is we expect broad growth across a number of customers.
Paul Coster - Analyst
Okay. My follow-up question is for Wajid, I want to make sure the 20% to 25% growth includes some non organic growth in the first quarter still from not quite lapping the RSP acquisition. Is that correct?
Wajid Ali - SVP, CFO
That's correct.
Paul Coster - Analyst
Okay. Thank you.
Operator
And our next question will come from Vijay Rakesh of Mizuho.
Vijay Rakesh - Analyst
Yes, guys. Thanks. So just looking here at the guidance. This is the first time we've had an RSP broken out, I guess. And when you look at dollars species now do they usually have a stronger December quarter, and a September quarter that's more like (inaudible). Is that (inaudible) and RSP usually looks?
Rick Bergman - President, CEO
Well, we didn't spend a lot of time examining RSP's history, this is obviously -- Synaptics had a lot going on going forward. So I think if you talk broadly, DDIC companies historically have -- do have a stronger second half calendar year than first half. Now, Synaptics, for those that have followed us, and I looked back on this the last three years. We've had a much stronger calendar first half than second half, or in other words, our fiscal year is back-end loaded by a nontrivial amount, 20% plus, over the last three years, each of those years.
Now, there were acquisitions in there that helped fuel some of that. But, nevertheless, it's those two trends, you could argue, fighting against each other now. When you start playing in specific OEMs, certain products and so on, we try to capture all of those in our guidance for Q1, as well as our fiscal year guidance.
Vijay Rakesh - Analyst
Got it. The 20% to 25% guide year-over-year, how comfortable are you with that guide, especially as you look out into the first half of next year, you know, when you look at the touch side or the fingerprint sensors side or display integration. If you can give us some more color on the confidence there. Thanks.
Rick Bergman - President, CEO
Well, again you have to look at our track record. And as I mentioned in my remarks, after the acquisition of RSPs, we reguided, because, basically, everything changed here at Synaptics with a major product line coming in and helping us, or disrupting some other things, and we gave guidance of 75%. Then we ended up doing a little bit better at 80% and in prior years, I think, would show a similar trend.
That being said, again we (inaudible) all those factors and felt comfortable that 20% to 25% is the right range to provide to the analysts and investor community going forward. As we talked about in prior calls, this is the season of design wins. And so some we got locked down now. Some are still open.
Our product portfolio is just great, whether it's our biometric, DDIC, TDDI and so on. But some of those designs still have to be locked down. We have to kind of weigh where we are competitively and where our products are. And I feel good that our competitive position is strong across our product line-up.
Vijay Rakesh - Analyst
Great. Thanks.
Operator
And our next question will come from Rob Stone of Cowen and Company.
Rob Stone - Analyst
Hi, guys. Thanks for taking my question. I wanted to ask about fingerprints in the quarter you just reported, Rick and Wajid. Can you give us any color on, you know, whether that mix in revenue has increased? Are you seeing -- what kind of shift is it all touch versus swipe at this point? And then related to that, how are you seeing the uptake of fingerprint applications within desktop PCs, based on the comments you had about new peripheral products, and I do have a follow-up. Thanks.
Rick Bergman - President, CEO
Okay. I'll take a crack at it, and if Wajid wants to add anything to it. I'll take the more general question, around what trends are we seeing in fingerprint adoption. Of course, last year it was primarily a premium -- used in premium solutions, whether it's Samsung or Apple tended to be the higher. Well, we'd [got] -- segment the high end of the smartphone marketplace. The big trend is now we are seeing midrange adoption. And I mentioned, one, the A8 from Samsung. It's a great looking phone. It's a 5.7-inch phone, and so maybe it's more of the higher end of the midst range, but, nevertheless, they're selling it in India and China. And I think it will get strong adoption there. And, it, of course, using our fingerprint solution. And it is a touch solution. So we're seeing a strong movement towards touch versus swipe. And I also had mentioned that the Sharp design, for certain reasons, they thought swipe would work better. Some of the performance on that in terms of security is quite high and that matched with their needs and works well in their market.
So we'll continue to see additional swipe opportunities as well. And I'm sure related to that is when is Synaptics going to see China OEM customers come out with products based on our solutions. You should expect to see an announcement from a top five China OEM, within this fiscal quarter, using our touch solution for fingerprint.
In terms of the uptake on desktop, it's probably a little early to call that. As I said in my remarks, Rob, just a tremendous amount of interest with either a mouse or keyboard or even a dock-based solution for fingerprint. And we're trying -- those are some of the things on a prior question, those are some of the things we're trying to sort out, how big is that business opportunity. The desktop moves, actually, very fast, as opposed to, say, the notebook PC market, especially, when you talk about peripherals. They can keep those out pretty quickly, so I don't think I can give you any specific financial unit guidance at this point, other than to say that the interest has been quite good.
Rob Stone - Analyst
Okay. Just a quick follow-up.
Wajid Ali - SVP, CFO
The only thing -- Rob, the only thing I would add to that, not only are we seeing year-over-year growth in fingerprint, but sequentially Q4 to Q1, we're also seeing growth in our fingerprint product business. So that's good news for us.
Rob Stone - Analyst
Great. Thank you, Wajid. You mentioned ForceTouch designs, Rick. Can you provide any color on sort of what is that going into smartphones? What type of device? And when might we see some of those in production?
Rick Bergman - President, CEO
Sure, Rob. Yes. We mentioned that. And again it's sometimes we're dependent on customer cycles, and I mentioned how desktops move a little bit faster than notebooks. Well, the phone manufacturers tend to moving the fastest of all. And so we would expect to see phones with Force utilizing our capabilities in the first half of calendar 2016. Additional notebook platforms, beyond the HP One, where we're still trying to sort that out, but they tend to move at a more deliberate annual cycle. So I wouldn't expect to see any additional notebooks until sometime in calendar 2016.
Rob Stone - Analyst
All right. Thank you.
Operator
Up next we have Ambrish Srivastava of BMO.
Ambrish Srivastava - Analyst
Hi, thank you, Rick and Wajid. On top of the call, Rick, you talked about the moderating growth. Just wanted to revisit the full-year guide. And I'm sure you have visibility into your design wins and the bundle wrapping, but what's embedded in the end-market growth assumptions when you look out for the fiscal year? And then a quick follow-up on the fiscal year is how should we be thinking about gross margin and OpEx? Thank you.
Rick Bergman - President, CEO
Okay. I'll take the first half and then let Wajid take the second half. So just to kind of give you how we're rolling into the fiscal year, it was in our comments, but just to reiterate, we see from Q4 to Q1, and Wajid just mentioned this as well, growth in our --call it our classic core markets, the touch and the fingerprint business growing sequentially. And for us that's great news, because if you look back last year, actually, sequentially, we had in the same business as we had a -10% which a growth. So that trend is clearly heading in the right direction.
A lot of that is based on some investments that we've made, obviously, in fingerprint and some of the touch solutions, display integrated solutions, specifically, so we're really excited about getting that back on a growth path. As we look over the fiscal year, again, we're not going to guide Q2 through Q3 and Q4, individually. But we think we can build on that success and then get those other pillars of growth going in a faster pace, the fingerprint and TDDI, to really fuel that 20% to 25% growth. And then in terms of the gross margin and OpEx, I'll let Wajid comment.
Wajid Ali - SVP, CFO
Hi, Ambrish. So in terms of gross margins, we're expecting to see gross margins modulate between 37% and 40%. We've presented that as part of our operating model. And we continue to expect to see all of our core product lines fall into a mix that would give us that level of confidence around that. Our OpEx will really modulate, so that we achieve our operating margins of 15% or better. We've talked about having operating margins in the mid to high teens and so we'll be modulating our operating expenses so that we achieve that.
Ambrish Srivastava - Analyst
Okay. Great. Thank you, gentleman.
Operator
Your next question will come from Rajvindra Gill of Needham & Co.
Rajvindra Gill - Analyst
Yes. Thanks for taking my questions. On the sequential guide, you gave some clarity on the fingerprint and touch being up, which is different from last year. But that would imply, obviously, that TDDI, the DDIC stuff, is going to be down sequentially. And I'm just trying to get a sense of that for September, given the fact that there will be, you know, I would think a new phone ramping in the fall. So just if you could provide some more color on the renaissance business, some of the puts and takes in the September quarter.
Rick Bergman - President, CEO
Sure. Again I'll start out. First, to address one of the kind of the questions there. On TDDI I think as we mentioned, it's great to be in volume production, but it's not a huge part of the Synaptics business at this point. So it's not really a major factor in terms of the growth. Specifically, around DDIC, there's various product cycles and customer ramps and so on that impact that business.
And some of those were favorable in our fiscal Q4 and in Q1 they're down. Now down is a relative term. It's relatively a small decrease in the grand scheme of things, but it is a little bit lower than what we saw in Q4. And again we depend on certain customer ramps, inventories, where we are in the bomb, and so forth. And it's one of the reasons we talked about as we go forward, we're investing in this area is we wanted to continue to build the strength of the DDIC and TDDI product line. And we're in the process of doing it.
As you heard in my remarks, we have four new DDIC products. At least one of a brand-new TDDI products that combine the combination of the two companies. And I really think that positions us in a great way for the rest of the fiscal year. Now, unfortunately, because those products are placed right on the display, the glass, the actual time from design win to mass production can be a little longer than a touch control or a touch pad or some of our other products. And so that's, again, another reason why we're talking about, hey, there's some good legs in the second half of our fiscal year.
Rajvindra Gill - Analyst
And then, Wajid, as a point of clarification, did you say that the fingerprint business doubled in the June quarter? Was that on a quarter-over-quarter basis or a year-over-year because -?
Wajid Ali - SVP, CFO
That was a year-over-year comment.
Rajvindra Gill - Analyst
Okay. Because last quarter in March, you said it also more than doubled. And that was on a year-over-year basis? In March, because if it I remember the fingerprint said -- you said had more than doubled in March.
Wajid Ali - SVP, CFO
Yes. So the comment on doubling was total year versus a total year, so fiscal 2015 versus fiscal 2014, our fingerprint business doubled year-over-year.
Rajvindra Gill - Analyst
Okay. Okay. Got it. And then for the -- and, again, just on the fiscal year 2016 guidance, because it implies a steep ramp in the second half. And given the guide-down for September, you know, there's some skepticism. So I'm trying to get a sense of when you're doing the fiscal 2016 year guidance, how much of it is of retaining certain customers, existing business, new business, new design wins versus old design wins. Because it does imply some sort of retention in customers. Right? And of major customers. I just want to get a sense of how you're building that out.
Rick Bergman - President, CEO
I can talk to the process, Raj, in terms of how we do our fiscal year. And we do look at all of those factors. Now, I can't share all of those. In some cases, as I mentioned in a prior question, like our PC business at this juncture, we have a pretty good idea of what it's going to be. I already mentioned the notebook business kind of works on annual cycles. They've made most of their decisions. There's a few outstanding opportunities for us, but we've got a darn good idea of what our PC business is.
Now, of course, as you saw in our results, that's only 11% of our business now. The vast majority of the business, therefore, is mobile or smartphones, which tend to make decisions later in our fiscal year. But again we've done well with a lot of the major customers. We have a very strong relationship, as you heard all - me rattle off all the high-end phones that use our products. There's a reason why they use our products and that's because we have the best technology in the industry.
And also you heard from Wajid that our OpEx is continuing to be strong. That's because we believe very firmly the growth opportunities that are in front of the Company, and we're not going to take our foot off the gas when we see that type of growth opportunities, both from a market as well as from a customers' perspective. So a little vague on the answer here, but a good chunk of that is customer retention. It better be, because we touch almost every smartphone out there in the industry now.
There are design wins to come on some major platforms that we have to do. But, again, we feel confident in that the growth numbers that we gave, including how our second half will be strong. You've followed us for a number of years, and you've actually, I'm sure, noted that pattern. That Synaptics historically is, or at least the last -- call it three years has been stronger in the second half of our fiscal years.
Operator
And I'll move on to Osten Bernardez.
Osten Bernardez - Analyst
Good afternoon. Thanks for taking my call. I was just trying to get a better handle on the fingerprint business which is reconciling -- following up on the last question and reconciling prior comments in the past. Would you say sequentially, so June quarter versus March quarter, what type of growth did you see given the changes in the mix of the business, because if you just kind of doubled quote unquote for the full year, year-over-year, that implies pretty significant decline quarter-over-quarter. So I'm just trying to get a sense of how we should be thinking about that.
Wajid Ali - SVP, CFO
Could you actually just repeat your question. I'm a little bit --
Rick Bergman - President, CEO
Is Q4 versus Q3, was the growth in our fingerprint? Now, don't break that out as a segment. The general trend is --
Wajid Ali - SVP, CFO
It's flat.
Rick Bergman - President, CEO
It's flat. It's Q4 over Q3, so yes. I don't quite get the math, how you're saying there's a substantial decline. That clearly wasn't the case, and then we see further growth in Q1.
Osten Bernardez - Analyst
Okay. And then just finally from me. Just going forward, could you just sort of remind us or tell us whether there's a change in the thinking of the slope of the ASP within the fingerprint business going forward, given you've talked about how, you know, the touch area sensor has historically -- well, you know, you're expecting it to have a sort of 2X premium, or to be priced 2X, sort of the swipe sensors. And you - we understand that you've introduced other SKUs that could probably also help your overall ASPs. But how do we think about the slope of the touch area sensor ASPs, let's say within your guidance, at least just for fiscal 2016, relative to the slope of ASPs for prior sensors?
Rick Bergman - President, CEO
Okay. So our prior guidance has been, because it's a new technology class, and we enjoyed relatively high ASPs, especially in the last fiscal year, that we expect about a 15% to 20% ASP decline on any given solution. And then, of course, as we introduce new solutions, there's an opportunity to bump back up to a higher potential ASP. We're seeing that play out, I would say, over the course of kind of calendar 2014, as well as calendar 2015. And then we're in the aspects -- or we're in the midst of quoting a number of calendar 2016 business. So I would say we're keeping kind of with that 15% to 20% ASP decline.
Osten Bernardez - Analyst
Thank you very much.
Operator
And our next question will come from Charlie Anderson of Dougherty & Company.
Charlie Andersen - Analyst
Thanks for taking my questions. I want to sort of beat the dead horse, if you will, on the DDIC business down sequentially. Did you guys lose any content at any major customers or major smartphones? And was there any sharing of content with anyone else? Wondering if that's factoring in or just pure, you know, the customers and the seasonality that you're seeing.
Rick Bergman - President, CEO
Charlie, it's more of the latter case. Seasonality and product ramps, inventory positions, those type of things.
Charlie Andersen - Analyst
Okay. Great. And then how ASP? Did ASP play a part at all?
Rick Bergman - President, CEO
No. ASP is not a factor. Again, similar to the prior question, of course, any given resolution or type of product goes through ASP compression through the year, but in the smartphones it's a little easier to put your finger -- or, excuse me, and a display driver it's a little easier to put your hands around. Typically, the higher resolution parts, as they are introduced, get nice ASPs. And then the older, of course, lower resolution parts get compressed over the years. So I would say our ASPs, in general, are flat as we are introducing new stuff and the older stuff goes down.
Charlie Andersen - Analyst
Great. Last one for me. I know there's been kind of a lot written into the quarter about your major customer DDIC. Will they change architecture? Will they multi-source? Will they take in-house? I know it's a tough question considering there's customer sensitivity, but I just wondered if that was an issue you want to address at all, Rick?
Rick Bergman - President, CEO
No. We have gotten people beating around the bush on that question a number of times, thanks for putting it out there. And it, obviously, with any of our major OEMs, we can't comment about specific opportunities or specific design wins, especially ones that could be one or two or multiple years into the future. All I can talk about is our DDIC technology. We believe is the best in the world. That's why we made the choice to acquire, specifically, RSP, and the best engineers, the best technology.
Likewise, on the touch side we have proven that with our market share and who uses our touch. And when you look at whether DDIC or TDDI type of products, it becomes a pretty easy for our major OEMs out there for their flagship or higher end phones, which direction they want to go. So, again, we're pretty happy with our position globally with our DDIC and TDDI solutions looking forward over the next couple of years. And that being said, we've got -- but we've got to earn every socket.
So nobody is saying, hey, it's automatic Synaptics, come in here. So we've got to earn it on technology, our quality, our manufacturing, our software support, our algorithmic support, as well as cost certainly comes into a play. But we're geared up for all of those battles and I'm confident we're going to win the vast majority of those battles.
Charlie Andersen - Analyst
Thanks so much.
Operator
And our next question will come from Liwen Zhang of Blalock Beal Van.
Liwen Zhang - Analyst
Thank you for taking my questions. Hi, Rick. You comment on the automotive area. Can you remind us the timeframe for Synaptics to have revenue contribution from that end market?
Rick Bergman - President, CEO
Yes. It's a great question. You know, kind of ironically it's now. So we haven't talked about it a lot, but, actually, with the RSP acquisition, we picked up a non-trivial amount of automotive DDIC business. And you know, it's measured in many millions of units per year and the same thing on the revenue side. Now is it 10% of Synaptics? No. It hasn't hit that level. I think what you're referencing is, well, what about call it expanding in that family, touch pads, touch controllers and those sort of things. That's where we're winning designs. And I also earlier talked about how fast the smartphone manufacturers move versus notebook OEMs. Automobiles are an entirely different beast.
So those are more three to four-year cycle. We've been fairly consistently saying it's a fiscal 2018 or calendar 2018 kind of timeframe. Clearly there's some other areas like I mentioned. The DDICs were having success much earlier. We've got products that fit there, and there's a few automobile manufacturers that will actually move a bit quicker than that, but where we expect it to make a decent sized dent in our financial results it's more that 2018 timeframe.
Liwen Zhang - Analyst
Thank you. And another question about your fingerprint. I remember the fingerprint solution for Samsung data (inaudible) had a little bit an issue. You used a third-party, kind of, you know, cooperate with third party. So is this still be the case, or you now are looking to print solution all your own, you know, solution?
Rick Bergman - President, CEO
So to my knowledge right now, there's three different external matchers that run on our fingerprint solution, and then we have our own. And very shortly all four of those combinations will be used in the marketplace. So our goal is to best support our customers with a complete solution. And whether it's our own matcher or a third-party matcher, we're happy to do that.
Our matcher has certain strength in some areas, in other areas there's third-party software companies that have done a better job than us or offer a different type of solution than we're able to offer. We simply can't address all of the opportunities out there with the team that we have, so, again, our goal is to provide the best total solution to our customer base. And we're doing that with a variety of different third-party matchers as well as our own.
Liwen Zhang - Analyst
Thank you. That's all I have.
Operator
And we'll hear next from John Vinh of Pacific Crest Securities.
John Vinh - Analyst
Hi. Thanks for making my question. Hey, Rick, you said you can expect a fingerprint design win from a top five OEM later this year. So that sounds pretty encouraging. But the pace of design wins outside of Samsung seems to be taking a little bit slower than expected to ramp. I know you've been talking about focusing on that major customer for quite some time. Can you talk a little bit about your design win visibility in the fingerprint space, and when can we start to see a more meaningful pickup in terms of design win traction outside of Samsung going forward?
Rick Bergman - President, CEO
Sure. So just to clarify. My remark was you'll see top five China OEM be in mass production by the end of this quarter that we're in, not the end of the year. That was in your question. So it's not far away I guess is the message there. And that's what you should expect to see is a continuing kind of cadence of additional design wins. Now, we're quite happy with our position at Samsung.
As you well know, depending on how it's counted, they're shipping 75 million to 80 million smartphones a quarter, which is still number one in the world, and it takes a lot of other guys to get to that volume. So we're thrilled to have them as a partner in the biometrics or fingerprint area and hope our success continues there.
John Vinh - Analyst
Got it. And then my follow-up question is just on ForceTouch. You talked about ForceTouch earlier in the call. Can you talk about whether that's a discreet or is that an integrated solution into your existing touch controller, and can you talk about what sort of premium you'd expect to get out of that solution?
Rick Bergman - President, CEO
Sure, John. Just like all of our solutions, we end up having a family of solutions, depending on the various OEMs and their vision on where they want to take the platform. As of now, it's an add-on feature for our touch controller devices, but you can expect high-end solutions, display integrated solutions, TDDI type of solutions over time as Force could eventually become an important feature across smartphones, as well as eventually notebooks.
So it tends to be -- or what tends to happen, it's its our higher-end products, because it does involve a lot more calculations in math and additional channels and so on. So it's more of a premium to our ASP or, excuse me, let me restate. It's a higher-end product that gets leverage, and so it changes our product mix effectively.
John Vinh - Analyst
Great, thank you.
Operator
And we'll hear next from Kevin Cassidy of Stifel.
Kevin Cassidy - Analyst
Yes. Thanks for taking my question. Your thoughts on gross margin modulating through the year between 37% and 40%. Can you give us what some of the moving parts would be for that?
Rick Bergman - President, CEO
Yeah. Hi there, Kevin. Obviously, a lot of that has to do with product mix. We've talked about the range of our products anywhere from TDDI and display driver products to fingerprint products all having various level of gross margins across the band. You know, so although all of them have got different gross margins at a product level, we believe that the mix is going to be such that we're going to be able to modulate between 37% and 40%. If you take a look at our post-RSPs transition, Q2, we were a little bit under that range, but kind of starring in Q3 of our fiscal 2015, we were able to start modulating kind of right in the middle of 37% to 39%.
And in Q4 we guided the same and we achieved a performance right in the middle. And for Q1 we're seeing very much the same, and so although our fingerprint and touch products are going to do a little bit better, sequentially, and our display driver business is going to be a little bit down, we're still expecting that type of range, even with our overall revenue levels coming down a tad bit sequentially. We're feeling very comfortable with that range as a target.
Kevin Cassidy - Analyst
Okay. And just as a TDDI goes into volume production, is that higher gross margin product than say the DDIC products?
Rick Bergman - President, CEO
Yes, it is.
Kevin Cassidy - Analyst
Okay. So I guess the long-term model, is that changing for gross margin?
Rick Bergman - President, CEO
No, it isn't. It isn't. We've modeled that through and we've taken a look at various scenarios and we're feeling quite comfortable that we'll be able to meet that targeted range. And, like I said earlier, what gives us confidence is that now we've got three quarters almost, two quarters behind us and one quarter ahead of us, of being able to achieve within that targeted range. So that's giving us a comfort level around that.
Kevin Cassidy - Analyst
Okay. Great. Thank you.
Operator
And we'll move on to Anthony Stoss of Craig-Hallum.
Anthony Stoss - Analyst
Hey, guys. Rick and Wajid if you wouldn't mind giving us what percentage of your overall revenue is in China, and also your view on, I guess, your customer base in China. If you think that will be, up, down, sequentially in September and just your view on what you see across the board from China. Thanks.
Rick Bergman - President, CEO
Okay. I'll let Wajid dig out the China revenue question. In terms of the marketplace, I think everybody in the industry is looking at results and input over the last few weeks. And there's clearly a lot of churn around well how strong is the China market going to be, as we go through the second half of calendar 2015. And we're kind of in that same mode as well. In some ways it's good news where last year Q2 was so strong, there was a bit of inventory build-up. We don't see that affect this year, and so we think we're seeing good, natural sell-through in the marketplace. And, overall, I would say we see a pretty solid market, but we're playing it conservative at this juncture and expecting fairly modest growth rates in the China market
Wajid Ali - SVP, CFO
Yeah. Just at a percentage level of our overall mobile revenue, in Q4 we were in the upper teens from a revenue percentage standpoint for China mobile products. And actually moving into Q1 we expect similar levels of mix from China mobile.
Rick Bergman - President, CEO
For those that have followed us, you know, that's an uptick. We kind of said low to mid-teens for the past few quarters so, as I said, we're seeing a nice overall bump there as we see our display integrated products take a more prominent role with the China OEMs.
Anthony Stoss - Analyst
And then the next, Rick, you mentioned ForceTouch. I'm just curious if there's a call from any of your customers related to ForceTouch for haptics and curious your view on haptics. Thanks.
Rick Bergman - President, CEO
So haptics is linked with Force, and I think any implementation you see on Force, will for the most part we'll have some sort of haptic response. That can range from a variety of things, from just auditory to the actual -- the physical vibration that you get in some solutions. So we'll see a range of haptic implementation going forward.
Anthony Stoss - Analyst
Thank you.
Operator
And it does appear we have no further questions at this time. I'll turn the conference over back to management for any additional or closing remarks.
Rick Bergman - President, CEO
Okay. Well, again, thank you, everyone. We had a good robust set of questions there. Appreciate it everyone getting in on the call today, and we look forward to talking to you in a few months. Thank you very much.
Operator
And that does conclude today's teleconference. We thank you all for your participation.