Texas Instruments' Organic LED Driver Enhances Image Quality of 2.5in Portable Displays

(Product News, 27 May 2008)

Texas Instruments Inc. (TI) has launched TPS65136, an organic light emitting diode (OLED) power driver designed to enhance image quality for small form factor displays up to 2.5in. The device supports active matrix OLED (AMOLED) displays used in mobile phones, digital cameras and portable media players. It manages power to AMOLED displays by providing positive and negative voltages, and supplying less current and lower voltages than passive matrix displays.

With just one 2.2µH inductor to generate both outputs on the single-inductor, multiple-output converter technology, the TPS65136 provides high picture quality and achieves a smaller solution size with a reduced component count. A buck-boost topology allows the device to generate a positive voltage up to 4.6V and adjustable negative output voltage down to -7V. In addition, the TPS65136 input voltage can be above or below the positive output voltage, allowing it to support new batteries with a starting voltage up to 4.8V.

The converter also lowers the switching frequency as the load current decreases to maintain high efficiency over the entire load current range. The TPS65136 maintains the switching frequency above the audible range with a voltage-controlled oscillator to avoid causing audible noise from the vibration of the ceramic output capacitors.

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