An addressing technique for displaying restricted patterns in rms‐responding LCDs by selecting a few rows at a time

Abstract

Abstract— An addressing technique that will allow rms‐responding matrix LCDs to display restricted patterns is proposed. This technique is based on the selection of a few rows at a time while scanning the display. In applications such as logic analyzers and oscilloscopes, mostly single‐valued functions of time are displayed. This restriction in the image is useful in enhancing the selection ratio so that good contrast is achievable even with TN‐LCDs. It is shown that a large reduction in the hardware complexity of the column drivers and the supply voltage is possible when the waveforms being displayed do not overlap each other and are equally spaced.

A Controller for Liquid Crystal Displays in Logic Analyzers and Oscilloscopes

“…This increases the hardware complexity of the column drivers for the matrix display. The number of voltage levels and, hence, the hardware complexity of column drivers can be reduced by selecting a few rows at a time [6]. This technique is reviewed briefly in the next section.…”

“…The maximum number of voltages in the column waveforms is and this occurs whenever the samples of all waveforms cluster in a subgroup. The techniques for displaying multiple waveforms are compared in [6] based on the number of voltage levels in the column waveforms and the supply voltage. The waveforms in Logic analyzers and electrocardiographs need not overlap or cluster in a subgroup.…”