Q: pitch so many specifications led display price list, that is good? The more dense the better? A: No, the more dense the more expensive. Too sparse words, close-see. For banner speaking, 5mm is more appropriate. Some stores in order to save money led display quotes, wants to be a big banner with the pitch of 30mm rental led display unit board to do, but good narrow street, opposite the pedestrian over here, the word is too big to stop down and look carefully to know is what led display, the effect is negative. B. entire unit board is not bright (black) 1, a few consecutive plate transverse direction is not lit, check the cable normal and abnormal cell plate connection between the cell plate is turned on; or chip 245 is normal two consecutive pieces plate in the longitudinal direction is not lit, check the power supply is normal in this column. Price led display, led display, high bright gold photoelectric provided by Jinan High Jinliang Optoelectronics Technology Co., Ltd .. Jinan High Jinliang Optoelectronics Technology Co., Ltd. (www.zhkyled.com) strong, credible, in Jinan, Shandong liquid crystal device industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the high Jinliang photoelectric and you hand into the brilliant, for a better future!