A visitor tries a touchscreen keyboard while the exhibitors look on at the Shenzhen International Touchscreen Expo, which kicked off at Shenzhen Convention and Exhibition Center on Thursday.  About 1,000 companies that develop and produce LED touchscreens from home and abroad have brought their latest products to the expo, attracting 36,000 professional buyers from 36 countries and regions. The expo will continue through Saturday. Sun Yuchen