AS VEGAS — LG Electronics Inc, hoping to tide through a global economic downturn and emerge stronger, wants to keep up spending and unveil new products to boost its North American presence. From a watchphone reminiscent of James Bond gadgets to a dozen new high-definition TVs, the South Korean tech giant introduced a slew of new products at the Consumer Electronics Show in Las Vegas on Wednesday and vowed to keep developing more to shore up its premium branding.