RLCD TRANSCONDUCTANCE SAMPLE AND HOLD COLUMN BUFFER

摘要

A column driving arrangement for an RLCD device isolates the source of a ramp voltage corresponding to gray-scale levels from the sample-and-hold gates of the individual columns. Preferably, this isolation is provided by an operational transconductance amplifier (OTA) at each column that provides a controlled current for charging the column capacitance to the appropriate gray-scale voltage level. The capacitor effects an integration of the current, thereby providing a noise-filtering effect. Additionally, each column capacitance is individually discharged, thereby obviating the need for a common high-current discharge device.