OLED-TV Display/Monitor Technology News

Driving advancements to power new display technologies, Texas Instruments Incorporated (TI) (NYSE: TXN)
introduced today an organic light emitting diode (OLED) power driver designed to enhance image quality for small form factor displays up to 2.5 inches. The TPS65136 power integrated circuit supports active matrix OLED (AMOLED) displays used in mobile phones, digital cameras and portable media
players. See: http://www.ti.com/tps65136-pr.

AMOLED displays allow each pixel to emit its own light, resulting in
high color saturation, thin form factor, high contrast ratio, fast response
time and low power consumption. TI's TPS65136 manages power to AMOLED
displays by providing positive and negative voltages, and supplying less
current and lower voltages than passive matrix displays.

Unique converter technology essential to AMOLEDs

With just one 2.2-uH 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 4.6 V and adjustable negative output voltage down to
-7 V. 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 4.8 V.

The unique converter technology results in excellent line and load
regulation, which is required to avoid potential display disturbances in
mobile devices during transmit periods. 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.

Designers have more OLED display driver options with TI

In addition to the TPS65136, TI provides a wide portfolio of OLED
drivers. The TPS65130 and TPS65131 can efficiently power portable
battery-powered equipment with a total efficiency of up to 89 percent. The
devices' input voltage range of 2.7 V to 5.5 V allows the TPS65130/1 to be
directly powered from lithium-ion, three-celled NiMH/NiCd or alkaline
batteries. This voltage, combined with the converters' minimum switching
frequency of 1.25 MHz, enables small power supply applications as the
converters require only a few external components.