| 摘要 |
An active matrix type liquid crystal display includes a groups of gate lines and a group of data lines with each of the gate lines and each of the data lines crossing with each other in a matrix form, a video signal generating circuit for generating a video signal, a plurality of detection circuits for measuring voltage fluctuations on the data lines, a reference voltage supply circuit for supplying a reference voltage to each of the data lines, a memory for storing the voltage fluctuations for pixels of at least one scanning line, and a circuit for combining the voltage fluctuations stored in the memory to the video signal from the video signal generating circuit. Each of the detection circuits is connected to each of the data lines, and the reference voltage supply circuit is formed by a variable voltage source and an analog switch connected to the data lines. The offset in the output voltages of data line drive ICs and thin film transistor drive circuits, which have heretofore been difficult to measure, can be measured accurately, and by correcting the offset, it is possible to realize a high gradation active matrix liquid crystal display.
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