HTC has unveiled two Windows Phone 8 handsets at an event in New York.

The firm has said that it intends to promote the 8X, which features a 4.3" (10.9cm) display, as its flagship device alongside the Android-powered One X.

The firm is also offering a smaller 8S model with a 4" (10.2cm) screen.

HTC's share price has fallen more than 50% since February after the firm experienced weak sales of earlier models despite positive reviews.

Analysts have said the firm had a weak advertising campaign which was compounded by the fact that its South Korean rival, Samsung, had a much bigger marketing budget.

Nokia and Samsung have already shown off alternative Windows Phone devices which will launch after Microsoft releases the operating system.