Milpitas, Calif.—Speeding the production process, Intersil Corporation's ISL45041 is a programmable Vcom calibrator with 7-bit EEPROM and I2C interface for setting the backplane common voltage in TFT-LCDs during panel assembly and test.
"Adjusting the Vcom of TFT-LCD panels is a labor-intensive process that can be simplified by using our new nonvolatile Vcom calibrator," said Oleg Steciw, marketing manager for the Display Products group. "This solution allows the user to replace one of the last mechanical stages in TFT-LCD panel assembly, reducing labor time and costs while significantly increasing reliability."
The ISL45041 allows quick adjustment of the Vcom voltage during display panel production to minimize LCD flicker; the designer's alternative is to use traditional potentiometers to set Vcom. In operation, the desired Vcom is loaded onto the chip's I2C interface, which serves to set the ISL45041's 128-step sink-current output. This stage, in turn, attaches to an external voltage divider. An increase in output sink current lowers the voltage on the divider, which drives the input of an external Vcom buffer amp. At power-up, the chip automatically comes up at the last programmed EEPROM setting.
Click here for the product datasheet. The ISL45041, in a 3-by-3 mm DFN-8 lead-free package, is priced at $1.40 each in 1k quantities.
Intersil, 1-888-INTERSIL, www.intersil.com