Lanci resigned from Acer over a conflict with the board about the best strategy for the company, including the importance of scale, growth, "customer value creation," and how to enhance its brand, Acer said in a statement. Acer Chairman J.T. Wang has stepped in as interim CEO until Acer finds a permanent replacement.

Analysts said Lanci's resignation may reflect a difference in opinion about how aggressively Acer should shift its focus from consumer PCs and pursue the markets for smartphones and tablet computers. Acer was one of the biggest sellers of netbooks, sales of which have been declining since Apple introduced the iPad last year.

In its statement Thursday, Acer highlighted the cautious approach it will take in the mobile device market.

"The personal computer remains the core of our business. We have built up a strong foundation and will continue to expand within, especially in the commercial PC segment. In addition, we are stepping into the new mobile device market, where we will invest cautiously and aim to become one of the leading players," Wang was quoted as saying.

The resignation came just under a week after due to weak demand in Western Europe and the U.S . Acer said PC revenue was showing declines of 10 percent from the fourth quarter of last year.