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名观众参观。预计2011年第十九届韩国广告展将有150多家企业参展,规模到达700多个展位,观众超过2万名。2011年展会同期还将举办韩国led/oled展,韩国户外广告大奖赛获奖作
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性。图3给出了几种通用的白色led驱动电路。图3. 对于典型的白光led,通常在IF = 20ma下测试其电特性测。因此,为了得到预知的和匹配的亮度与色度,建议采用恒流驱
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