Low noise digital data driver circuit integrated poly-Si TFT-LCD
We have newly designed a data driving circuit of the digital type for TFT-LCDs with high performance integrated circuit. The main advantages of this circuit are: (1) low noise digital driver including simple digital-to-analog converters (DACs), (2) easy selection of inversion method (row/column/dot), (3) capability of data error correction, and (4) driving scheme by line at a time. The line-by-line digital type is suitable for large TFT-LCDs. It consists of a pair of latches and DACs. All video signals stored in the first latches are written to the second latches simultaneously in each horizontal scanning period. Good horizontal resolution is obtained in this driver because the DACs write the video signals of the data lines as long as they are in the horizontal scanning period. This is long enough even if the capacitance of the data line is very large. Also, the new designed data driver architecture can be easily extended to higher bit signals scheme and has realized a good gray scale.
data driver digital-to-analog converters thin film transistor