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Optoelectronics/Displays??

LED drivers improve 3D performance, power use

Posted: 27 Oct 2011 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? power supply IC? 3D TV?

austriamicrosystems AG has expanded its portfolio of LED drivers and LED power supply ICs. Altogether, the products promise to boost the performance and power efficiency of LED TVs.

The AS3822 and AS3823 are 6- and 8-channel LED driver ICs, respectively, and are fully compatible with the 16- and 12-channel AS3820 and AS3821 LED drivers. This compatibility enables TV makers to use the same hardware design and software for LED TVs. The devices use austriamicrosystems' enhanced digital power feedback control technique to achieve the lowest possible energy consumption, said the company. Additionally, smart dimming functionality further cuts power consumption while tackling the needs for the latest 3D TV designs and the highest picture quality.

The AS3810 16-channel LED driver with internal FETs is the third generation of driver ICs for direct-lit TVs. It features channel-to-channel capability and all the functionality needed to optimize power consumption in large direct-lit TVs, noted the company. Multiple ICs are easily combined to realize even dozens of dynamically dimmed backlighting segments, further reducing power consumption and fully supporting the best possible contrast.

All of the driver ICs match the AS1390 combination boost controller/buck converter that is optimized for the power needs of LED TV backlights. It supplies the LED backlight with a high-power constant-frequency boost controller optimized for up to 90V/3A combined with a 5V/100mA step-down converter. In addition, the AS1390 supports the needs of low energy consumption for LED TVs with more than 95 percent power efficiency. The continuous conduction mode of the IC provides superior bandwidth and transient response, noted austriamicrosystems. It also includes all required safety features, including overvoltage, overcurrent and overtemperature protection.

Smart light sensors from TAOS were recently added to austriamicrosystems' product portfolio. These devices significantly contribute to further reducing energy consumption through use of ambient light sensors to automatically adjust the screen brightness to suit the surrounding light environment.

The AS3810, AS3822, AS3823 and AS1390 are all sampling.





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