Large area flexible lighting element controlled by mobile phone user interface

Roll-to-roll compatible processes are opening up the new opportunity for high throughput and cost-efficient manufacturing of electronics and other required functionalities. Extending the continuous roll-to-roll manufacturing approach as far as possible in the manufacturing process to assembly and bonding, the manual assembly and handling phases can be almost fully eliminated. Modern assembly and bonding machines, such as EVO2200, enable component bonding on flexible substrates in high throughput roll-to-roll process using anisotropic conductive adhesives (ACAs). There are needs to build up large area flexible lighting elements to be applied as bendable forms. In addition, lighting colour or colour temperature and brightness tuning is typically preferred in circadian rhythm lighting applications. Organic LED (OLED) technology is promising option to produce large area, uniform and flexible lighting element. Flexible OLED structure lifetime, efficiency and luminous flux output, however, are still modest when compared to inorganic LED performance. In addition, colour temperature tuning is typically not available. We have designed and implemented large area white light flexible lighting element demonstrator, which colour temperature can be tuned from 2700K to 6500K and brightness in range of 1...100% of nominal maximum intensity value utilising inorganic LEDs. Lighting element structure consisted of three superimposing LED foils each surface area being 185 mm x 650 mm each equipped with specific colour temperature CSP LEDs. When all LEDs in all three foils were driven with 20mA current the created luminous flux was about 2200 lm. Measures of the demonstrator lighting system were about 185 mm (W) x 600 mm (L) and maximum thickness about 1.5 mm Maximum measures of the demonstrator system with electro-mechanical interconnection heads were about 230 mm (W) x 700 mm (L) and 30 mm (T). Wireless communication between lighting element and mobile phone was implemented using Bluetooth radio modules. In addition, touch screen user interface for lighting system control was implemented in mobile phone using Android operating system.