| 摘要 |
To provide display devices with improved image quality and reliability or display devices with a large screen at low cost with high productivity, an electrode layer containing a conductive polymer is used as an electrode layer for a display element, and the concentration of ionic impurities contained in the electrode layer containing a conductive polymer is reduced (preferably to 100 ppm or less). Ionic impurities are ionized, and easily become mobile ions, and they deteriorate a liquid crystal layer or an electroluminescent layer, which is used for a display element. Therefore, an electrode layer containing a conductive polymer, in which such ionic impurities are reduced is provided; thus, reliability of the display device can be improved. |
