The two companies said changes in the world economy have pushed them to extend talks, originally started almost a year ago, and put-off by one year the targeted start of the new venture to March 2010.
The companies will continue to talk under a memorandum of understanding that was signed in February last year and now plan to reach a definitive agreement on the venture by the end of June this year.
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The planned joint venture was supposed to start operating this year and take over a new LCD factory that Sharp has already started building in Sakai in western Japan. Through the new venture Sony would have shouldered roughly 34 percent of the cost of the $4.2bn factory.
Sharp said the change in schedule for the joint venture won't affect the schedule of the new Sakai plant, which will begin operations in March 2010.
See also: New Sony mobile products in the pipeline