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A 640-channel 6-bit LCD column driver with a cross-self-bias push-pull buffer is presented. To design a column driver for thin-film transistor liquid-crystal displays (TFT-LCDs), both low power consumption and chip area are key problems that must be solved. Therefore, the proposed cross-self-bias buffer amplifier effectively reduces the circuit area and power consumption overheads of conventional...
An output buffer with slew-rate calibration for different TFT-LCD loadings is presented. Unlike other output buffers of column drivers, the proposed output buffer adjusts the output current according to the loading capacitors. The settling time and slew-rate of the proposed output buffer are thus fixed in an acceptable range for different TFT-LCD loading capacitors, allowing more accurate color quality...
An 8-bit LCD source driver with push-pull buffer amplifiers for N-dot inversion driving is presented. The proposed push-pull output buffer amplifier with dynamic bias effectively increases the transient response, reducing the transistor count of the bias circuit and decreasing the quiescent current path. An 8-bit source driver supporting an N-dot inversion driving scheme is implemented using 0.35μm...
Area-efficient resistor-capacitor DACs (R-C DACs) and low-offset push-pull output buffers for a 10-bit LCD source driver are proposed. Comparing to a 10-bit resistor-string DAC (R-DAC), the 10-bit R-C DAC has a smaller area. A new output buffer with a push-pull function is adopted so that the source driver can drive the pixel with two-dot inversion to save power consumption. To reduce channel to channel...
A new compact rail-to-rail buffer amplifier for active matrix liquid crystal display source driver applications is proposed. Two complementary buffer amplifiers driving a pair of column lines are used to realize a rail-to-rail driver. The compact buffer amplifier has a large driving capability with the function of charge and discharge provided by the current positive-feedback (CPF). The CPF can increase...
A compact low-offset voltage and low power rail-to-rail output buffer for TFT-LCD panel is presented in this paper. Compared to other push-pull output buffers, the proposed output buffer has self-bias circuit which can achieve the smaller area and the lower power consumption. Two complementary push-pull output buffers drive a pair of column lines realize the rail-to-rail driver construction. In addition,...
The design of a compact low-power highspeed class-AB buffer amplifier for driving the large column line loads of large-size TFT-LCD is presented in this paper. The class-AB buffer amplifier can drive large column line loads up to lOOOpF within 1.28 mus. The proposed class-AB buffer amplifier is implemented with a standard 0.35 mum CMOS 2-poly 4-metal process technology and simulated using HSPICE....
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