平板显示技术_C5 OLED精要.ppt

平板显示技术Flat Panel Display Technology 主动发光 主动发光 功耗小 轻、薄 Panasonic Matsushita （ 37-inch OLED TVs） 可弯曲 Samsung Demos Worlds First Bendable OLED Screen 主要内容 1 有机半导体基础 2 OLED原理 3 OLED 器件设计 4 OLED显示面板的设计 5 OLED驱动原理 6 OLED 制作 7 OLED衰减机理 8 未来发展方向 OLED vs LCD 1 有机半导体基础 Transport in organic single crystals Single crystals Holstein model Kenkre Model Silinsh and Capek model Norbert Karl’s data (1980’s) Hendrik Schon’s data (1999-2001)* Organic semiconductors Molecular orbitals Bonds and Bands Hydrocarbons Orbital Description of probable electron density near a nucleus s Orbital Lowest energy orbital, spherical in shape p Orbital Dumbbell shaped Hybridization Mixing of orbitals Filling of orbitals Each molecular orbital can have a max. of 2 electrons Pauli principle (2 electrons must have opposite spin) Aufbau principle – Electrons always occupy orbitals of lowest energy first Bonding Covalent (Si) Electron sharing – 2 or more electrons shared by 2 or more atoms Ionic (GaAs) Electron transfer Van der Waals (Bonding between covalent molecules) London forces (attraction between molecules with no permanent dipole moment) Dipolar attraction (polar molecules) Hydrogen bonding (covalently bound hydrogen + negative dipole) 2 OLED发光原理 Recombination of hole and electron/ LED OLED operation Light Emitting Polymers Light Emitting Polymers Light Emitting Polymers have a lot of advantages … Low energy consumption Usefull for large area lighting Simple to use technology Permits flexible lighting and displays A technology for the future But how do Light Emitting Polymers  But how do Light Emitting Polymers  But how do Light Emitting Polymers  But how do Light Emitting Polymers  单重态 vs 三重态 Energy transfer: improve efficiency 提高出光效率(1) 提高出光效率(2) 将基体波导模式转换成外部模式 在玻璃基体的背侧贴附毫米级半球透镜或微透镜阵列，可将光出射效率提高2倍。 将玻璃基体背侧做成波纹表面或随机表面形状，使得光子能够通过更多的途径反射并最终出射到外部，可将光出射效率提高2倍。 将散射介质分散在折射率与玻璃基体折射率相近的材料中，然后涂敷在玻璃基体的背侧，光出射效率可提高至40%。 提高出光效率(3) 将ITO/有机物波导模式转换成外部模