The Study on Center-hollowed Microlens Array of Organic Light Emitting Devices

• Main Authors: Jheng-Hao Fang, 方正豪
• Other Authors: Mao-Kuo Wei
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/41770063412469018199

碩士 === 國立東華大學 === 光電工程研究所 === 96 === External quantum efficiency (EQE) of an organic light-emitting device (OLED) can be greatly improved by attaching a microlens array film for display and lighting applications. When the pixel size is too small (ex: < 0.25 mm2), the relative luminous efficiency is even lower than 1, which means that the attachment of the microlens decreases the light output, rather than increasees. Hence, in this paper, we propose new layouts of the microlens arrays for obtaining high luminous current efficiency, especially for small size OLEDs. In this study, we design new hollow arranged microlens arrays to achieve high luminance enhancement and less blur effect for the OLED display application. On the other hand, two different attachment methods of microlens arrays on the OLEDs were investigated. The optical properties and the image blurring of the device were also studied. The first method was used silicone oil to attach a microlens-array film on the OLED. The second method is to make microlens array directly on the OLED substrate. With less microcavity effect and material absorption, the OLED device efficiency can be improved and can generate less image blurring.