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Optoelectronics/Displays??

TFT-LCD VCOM/gamma buffer supports rapid switching

Posted: 15 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:TFT-LCD? rapid switching? VCOM/gamma buffer?

Maxim Integrated Products has introduced the DS3510, a highly integrated gamma/VCOM buffer with on-chip EEPROM that supports four gamma curves and rapid switching among curves.

This device is composed of 10 independent gamma channels and one VCOM channel; each channel includes 4bytes of EEPROM, two latches, an 8bit DAC and a high-performance buffer amplifier. These features enable pin-controllable, gamma/VCOM table switching in less than 300ns. When speed is not critical, table switching can be commanded through an I?C-compatible interface. Each table implements a different gamma curve, which allows TFT-LCD designers to compensate for a wide variety of conditions, such as temperature, ambient-light level, backlight setting, aging and color mode in sequential displays.

Additionally, each of the DS3510's 10 gamma outputs supports current sinking/sourcing over the full analog range. Competitive solutions typically place inconvenient voltage and current-direction restrictions on each gamma output, which can lead to incompatibility with column-driver input characteristics and complicate PCB layout. The DS3510 eliminates these concerns, the company said.

This device operates from a 2.7V to 5.5V digital supply and supports an analog supply range of 9V to 15V. Fully specified to operate over a wide -45C to 95C temperature range, the DS3510 is packaged in a 48-pin TQFN that is available in either bulk or tape-and-reel form. Prices start at $1.50 (10,000-up, FOB USA).





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