Category : Cameras, image sensors, imaging systems, scanners, thermography, UV viewers > OLED display

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OLED (organic light emitting diodes) require a current driving scheme in contrast to LCD, which are voltage driven. Therefore new driving and controller concepts had to be developed, which became implemented into the passive-matrix OLED (PMOLED) control IC's for performing the appropriate driving schemes as well as certain controlling and interface functions. These devices are intended for being applied within modules based on Fraunhofer IPMS OLED panels, however they may also act as application-specific standard products (ASSP), since their built-in functions provide compatibility to a wide range of passive-matrix OLED panels. On the SID the IPMS presents the most advanced driver (OC2) version, which supports current PMOLED display resolutions of 128 columns x 64 rows in single-chip mode (but also 256x64 and higher in cascaded multi-chip mode) and area or full-color (RGB) operating modes. The life-time of the OLED display is optimized by monitoring OLED pixel electrical parameters vs. time and a subsequent internal control loop. The on-chip generated high voltage supply for the current-source column outputs can be programmed, as well as the voltage difference between row and column. In order to allow wide flexibility for both operating parameters and functional performance an embedded, externally programmable micro-controller core was introduced. Appropriate firmware is stored in internal non-volatile memory. By proper adjustment of that, e.g., the digital I/O interface may be adapted to external requirements, e.g., in automotive applications. Therefore in addition to standard parallel and serial interfaces a physical low-voltage differential signaling (LVDS) interface was implemented. The IC is a mixed-signal ASIC packaged COB and being fabricated in a commercially available 0.6 µm, 3.3/5V, HV CMOS process supporting an operating temperature range of –40..+125°C. The process is available for large volume production.

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- OLED modules fabricated on the world's first vertical In-Line fabrication line

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