SBOS571C August 2011 – August 2018 BUF20800-Q1
Traditional gamma buffers rely on a resistor string (often using expensive 0.1% resistors) to set the gamma voltages. During development, the optimization of these gamma voltages can be time-consuming. Programming these gamma voltages with the BUF20800-Q1 can significantly reduce the time required for gamma voltage optimization. The final gamma values can be written into an external EEPROM to replace a traditional gamma buffer solution. During power-up of the LCD panel, the timing controller reads the EEPROM and loads the values into the BUF20800-Q1 to generate the desired gamma voltages. Figure 10a shows the traditional resistor string; Figure 10b shows the more efficient alternative method using the BUF20800-Q1.
BUF20800-Q1 uses the most advanced high-voltage CMOS process available today, which allows it to be competitive with traditional gamma buffers.
This technique offers significant advantages: